[Mod] Gran Turismo plus (bug fixes and restored content) - alpha 1 released

[pez2k]

Gran Turismo plus (GT1+) is a bugfix and update for Gran Turismo. It fixes outstanding bugs in the game, and restores some cut and unused content.

Currently, as an alpha version, only the PAL version of the game is supported.

Expand any of the spoiler tags below for further information on the mod, or see the included readme file.

Spoiler: Screenshots

Arcade-only cars added to the GT mode dealerships for purchase:

All missing features added to the previously Arcade-only cars, such as descriptions and upgrades:

Missing Hondas restored to the dealership:

Revised and adjusted car models:

Fixes for physics bugs such as certain AWD cars behaving like FWD cars:

Reverted certain branding changes to the original pre-release logos:

Fixed issues with specific used cars never showing up:

Various code bugs fixed (optionally) to resolve issues with displayed power and weight values:

Spoiler: Changes from the base game

- Miscellaneous
Fixed the displayed suspension upgrade level for all racecars in the Fitted Parts screen so that it no longer shows up as NEED-JA.HTM.
Fixed several grammatical errors, missing words, and overlapping text in the Fitted Parts screen in English, and tweaked the names to match what is shown in the pre-race menus.
Fixed the Nissan Skyline GT-R in Arcade mode using the logo for the GT-R V spec.
Fixed the Subaru Impreza WRX '94 showing up as the WRX Wagon '94 in the Used Car list, causing the Wagon to be slightly more common and slightly more expensive than intended.
Fixed the Subaru Impreza WRX Wagon '94 showing up as the WRX Wagon STi Version II '95 in the Used Car list, causing the Wagon STi to be much more common and much cheaper than intended.
Fixed the Subaru Impreza WRX STi Version II '95 showing up as the WRX '94 in the Used Car list, causing the WRX to be much rarer and much more expensive than intended, as well as never being available in Black Mica or Cosmic Blue.
Fixed the Subaru Impreza WRX Wagon STi Version II '95 showing up as the WRX STi Version II '95 in the Used Car list, causing the STi to be slightly rarer and slightly cheaper than intended.
Fixed a typo in the pause menu in Italian - USICITA -> USCITA.

- Audio
Nissan Silvia Q's '95: Switched to a Silvia engine sound like the other S14s instead of a Skyline sound.
Nissan Silvia Q's '96: Switched to a Silvia engine sound like the other S14s instead of a Skyline sound.

- Models / Textures
Dodge Copperhead: Fixed texture error on rear deck.
Dodge Copperhead RM: Fixed texture error on rear deck.
Dodge Viper GTS: Corrected the stripes on the rear from 1996 spec to 1997 spec.
Honda Civic Ferio '96 RM: Fixed texture spike in the rear wheelarches.
Honda NSX: Fixed the rear wing being warped at night.
Honda NSX '90: Fixed the rear wing being warped at night.
Honda NSX '90 RM: Fixed various UV mapping asymmetries and warping on both the day and night models.
Honda NSX Type R: Fixed the rear wing being warped at night, and removed the Quasar Gray, Cranberry Red, Estoril Turquoise, Bay Leaf Green, and Monte Carlo Blue colours copied from the NSX '90 but never offered on the Type R.
Honda NSX Type R RM: Fixed various UV mapping asymmetries and warping on both the day and night models.
Honda NSX Type S: Fixed the rear wing being warped at night.
Honda NSX Type S Zero: Fixed the rear wing being warped at night.
Mazda RX-7 Infini III RM: Fixed the stripe colours on the rear not matching the rest of the car, especially the blue and red version.
Nissan Skyline GTS-4 '91: Replaced the 2-door coupe car model with a 4-door saloon to match the weight, dimensions, and car description, and to make it more unique.
Subaru Impreza Rally Car: Fixed leftover blue paint on black version, fixed inverted grille texture when viewed from a distance.
Subaru Impreza WRX '94 RM: Fixed 'SURARU' typo on the rear.
Subaru Impreza WRX '96 RM: Fixed 'SURARU' typo on the rear.
Subaru Impreza WRX STi Version II '95 RM: Fixed 'SURARU' typo on the rear.
Subaru Impreza WRX STi Version III '96 RM: Fixed 'SURARU' typo on the rear.
Subaru Impreza WRX STi Version III '96 (Prize) RM: Fixed 'SURARU' typo on the rear.
Subaru Impreza WRX type R STi RM: Fixed 'SURARU' typo on the rear.
Toyota Supra GT Turbo Limited RM: Fixed a hole in the rear bumper on the black colour.

- Text
Aston Martin DB7: Updated the colour names to the real names used in GT2.
Aston Martin DB7 Volante: Updated the colour names to the real names used in GT2.
Chevrolet Corvette 427 Coupe '67: Wrote a car description to prevent crashes (English only so far, blank in other languages).
Dodge Copperhead: Reverted the name and logo from the generic Concept Car back to the original Copperhead.
Dodge Viper GTS: Updated the colour names to the real names, and fixed a typo in the car description - 1.8-litre -> 8-litre.
Dodge Viper RT/10: Updated the colour names to the real names, and fixed a typo in the car description - 1.8-litre -> 8-litre.
Eunos Cosmo Type-E: Fixed typos in the car description - Cosmos -> Cosmo, rotar -> rotor, first twin-rotor -> first 3-rotor.
Eunos Cosmo Type-S: Fixed typos in the car description - Cosmos -> Cosmo, rotar -> rotor, first twin-rotor -> first 3-rotor.
Eunos Roadster (Prize): Added the missing model name to match the original car.
Eunos Roadster S Special: Fixed a typo in a paint colour - Melrot -> Merlot.
Honda Accord SiR: Fixed punctuation errors in the Taffetas White and San Marino Red paint colours.
Honda Civic SiR-II '93: Fixed typos in the English and Italian car descriptions - Sports civic -> sports Civic / sportiva Civic.
Honda Civic Type R: Fixed punctuation errors in the English car description, and fixed a punctuation error in the Starlight Black Pearl paint colour.
Honda Integra SiR-G: Fixed a punctuation error in the Starlight Black Pearl paint colour.
Honda Integra Type R: Fixed a punctuation error in the Starlight Black Pearl paint colour.
Honda NSX '90: Fixed punctuation errors in the Grand Prix White and Bay Leaf Green paint colours, and fixed a mistranslated paint colour - Shallot -> Charlotte.
Honda NSX '97: Fixed punctuation errors in the Grand Prix White and Grand Prix Red paint colours.
Honda NSX Type R: Fixed a punctuation error in the Grand Prix White paint colour, and fixed a mistranslated paint colour - Shallot -> Charlotte.
Honda NSX Type S: Fixed punctuation errors in the Grand Prix White and Grand Prix Red paint colours.
Honda NSX Type S Zero: Fixed punctuation errors in the Grand Prix White and Grand Prix Red paint colours.
Honda Prelude SiR: Fixed punctuation errors in the Taffetas White and San Marino Red paint colours.
Honda Prelude Type S: Fixed punctuation errors in the Taffetas White and San Marino Red paint colours.
Mazda Demio LX: Fixed punctuation errors in the English car description.
Mazda Demio GL: Fixed punctuation errors in the English car description.
Mazda Demio GL-X: Fixed punctuation errors in the English car description, and fixed a typo in a paint colour - Metalic -> Metallic.
Mazda Roadster RS '98: Removed the Eunos branding as it was not used from 1998 onwards, and wrote a car description to prevent crashes (English only so far, blank in other languages).
Mazda RX-7 Infini III: Added the missing 'Infini' name.
Mitsubishi FTO GPX: Fixed a typo in a paint colour: Kilder -> Kielder.
Mitsubishi FTO GR: Fixed a typo in a paint colour: Kilder -> Kielder.
Mitsubishi Mirage Asti RX: Fixed a typo in a paint colour: Kilder -> Kielder.
Mitsubishi Mirage Cyborg ZR: Fixed typos in paint colours - Corse Gray -> Coarse Gray, Champagnish Yellow -> Champagne Yellow, Sainto Amour Green -> Saint Amour Green.
Nissan Silvia Q's '88 (Prize): Added the missing model year to match the original car.
Nissan Skyline GTS-4 '91: Fixed typos in the car description - RB20DETT -> RB20DE, GTS M-Type -> GTS25.
Nissan Skyline GTS-t Type M '91: Fixed typos in the car description - RB20DETT -> RB20DE, GTS M-Type -> GTS25.
Nissan Skyline GTS25 Type S '91: Fixed typos in the car description - RB20DETT -> RB20DE, GTS M-Type -> GTS25.
Nissan Skyline GTS25t: Fixed a punctuation error in the Super Clear Red II paint colour.
Nissan Skyline GT-R '89: Fixed punctuation errors and a typo in the car description - calliper -> caliper.
Nissan Skyline GT-R '91: Fixed punctuation errors and a typo in the car description - calliper -> caliper.
Nissan Skyline GT-R '95: Fixed a punctuation error in the Super Clear Red II paint colour.
Nissan Skyline GT-R '97: Fixed a punctuation error in the Super Clear Red II paint colour.
Nissan Skyline GT-R Nismo '90: Fixed punctuation errors and a typo in the car description - calliper -> caliper.
Nissan Skyline GT-R V spec '93: Fixed punctuation errors and a typo in the car description - calliper -> caliper.
Nissan Skyline GT-R V spec '95: Fixed a punctuation error in the Super Clear Red II paint colour.
Nissan Skyline GT-R V spec '97: Fixed a punctuation error in the Super Clear Red II paint colour.
Nissan Skyline GT-R V spec II '94: Fixed punctuation errors and a typo in the car description - calliper -> caliper.
Subaru Alcyone SVX S4: Fixed the name in the car description being typoed as 'Alshione' in all five PAL languages.
Subaru Alcyone SVX Version L: Fixed the name in the car description being typoed as 'Alshione' in all five PAL languages.
Subaru Impreza WRX '94: Fixed the replay name being swapped with another WRX model, and fixed the car using a WRX STi description instead of WRX.
Subaru Impreza WRX STi Version II '95: Fixed the replay name being swapped with another WRX model.
Subaru Impreza WRX Wagon '94: Fixed the replay name being swapped with another WRX model.
Subaru Impreza WRX Wagon STi Version II '95: Fixed the replay name being swapped with another WRX model, and fixed the car using a WRX description instead of WRX STi.
Toyota Celica GT-Four: Fixed a punctuation error in the Super White II paint colour.
Toyota Celica SS-II: Fixed a punctuation error in the Super White II paint colour.
Toyota Chaser Tourer S: Fixed punctuation errors in the Super White II and Dark Green Mica P.I.O. paint colours.
Toyota Chaser Tourer V: Fixed punctuation errors in the Super White II and Dark Green Mica P.I.O. paint colours.
Toyota Corona Exiv: Fixed typos in the car description - Exive / Exi V -> Exiv, SS-111 -> SS-III.
Toyota Mark 2 Tourer S: Fixed punctuation errors in the Super White II and Dark Green M.I.O. paint colours.
Toyota Mark 2 Tourer V: Fixed punctuation errors in the Super White II and Dark Green M.I.O. paint colours.
Toyota MR2 G-Limited: Fixed a punctuation error in the Super White II paint colour.
Toyota MR2 GTS: Fixed a punctuation error in the Super White II paint colour.
Toyota Soarer 2.5 GT-T '95: Fixed a typo in a colour name: Phtalocyanine -> Phthalocyanine.
Toyota Supra SZ-R: Fixed a punctuation error in the Super White II paint colour.
Toyota Supra RZ: Fixed a punctuation error in the Super White II paint colour.
Toyota Supra SZ-R '95: Fixed a punctuation error in the Super White II paint colour.
Toyota Supra RZ '95: Fixed a punctuation error in the Super White II paint colour.
Toyota Supra Twinturbo R: Fixed punctuation errors in the English car description.
TVR Griffith Blackpool B340: Reverted the 'Griffith 4.0' name back to the accurate Blackpool B340 name from the Japanese version.

- Upgrades / Physics / Stats
Aston Martin DB7: Corrected the final drive ratio to 3.545:1, increasing top speed dramatically.
Aston Martin DB7 (Prize): Corrected the final drive ratio to 3.545:1, increasing top speed dramatically.
Aston Martin DB7 Volante: Corrected the final drive ratio to 3.545:1, increasing top speed dramatically.
Chevrolet Corvette 427 Coupe '67: Added a full set of upgrade parts, minus an RM, corrected the upgraded tyre sizes, and corrected the rear suspension type.
Eunos Roadster '89: Fixed the weight and dimensions copied from the later 1.8-litre equivalent, and corrected mismatched wheel sizes with upgraded tyres.
Eunos Roadster: Corrected mismatched wheel sizes with upgraded tyres.
Eunos Roadster (Prize): Corrected mismatched wheel sizes with upgraded tyres.
Eunos Roadster S-Special '92: Fixed the weight and dimensions copied from the later 1.8-litre equivalent, and corrected mismatched wheel sizes with upgraded tyres.
Eunos Roadster S-Special: Fixed the mismatched base 14" wheels on the front and S-Special 15" wheels on the back.
Eunos Roadster V-Special '90: Fixed the weight and dimensions copied from the later 1.8-litre equivalent, and corrected mismatched wheel sizes with upgraded tyres.
Eunos Roadster V-Special: Corrected mismatched wheel sizes with upgraded tyres.
Honda Accord SiR '96: Corrected the weight from auto 1320kg to manual 1290kg, fixed the width stat copied from the wagon.
Honda Civic Ferio '93: Fixed the car making too little power.
Honda Civic SiR II '93: Corrected the weight from SiR 1040kg to SiR II 1050kg, and fixed the car making too little power and compensating for it with a power multiplier, resulting in too much torque.
Honda Civic SiR II: Corrected the weight to 1080kg.
Honda CR-X del Sol SiR '92: Corrected the weight to 1110kg.
Honda Integra SiR-G: Corrected the weight from auto 1120kg to manual 1100kg.
Honda Integra Type R: Corrected the weight and dimensions from saloon values to a coupe to match the model.
Honda NSX '90: Corrected the tyre sizes, as they had been copied from the '97, and adjusted the RM weight to be slightly heavier than the other NSX models.
Honda NSX '97: Adjusted the RM weight to be slightly heavier than the other NSX models.
Honda NSX Type R: Fixed the final drive ratio and tyre sizes being copied from the base '96, fixed the height stat not taking into account the lower Type R suspension, and adjusted the WR 3 and RM weights to remain lighter than the Type S and base NSX, instead of up to 80kg heavier.
Honda NSX Type S: Adjusted the RM weight to be slightly lighter than the base NSX instead of much heavier.
Honda NSX Type S Zero: Adjusted the RM weight to be slightly lighter than the adjusted Type S RM.
Honda Prelude '91: Corrected the weight from 1993 1240kg to 1991 1230kg.
Honda Prelude VTEC '91: Corrected the weight from auto 1290kg to manual 1260kg, and fixed the car making 15PS too much power.
Mazda Demio A spec: Fixed the stage 1 turbo costing the same amount as stage 2.
Mazda Demio LX: Adjusted the weight reduction parts to prevent stage 3 being lighter than the full RM, and fixed the stage 1 turbo costing the same amount as stage 2.
Mazda Demio GL: Adjusted the weight reduction parts to prevent stage 3 being lighter than the full RM, and fixed the stage 1 turbo costing the same amount as stage 2.
Mazda Demio GL-X: Adjusted the weight reduction parts to prevent stage 3 being lighter than the full RM, and fixed the stage 1 turbo costing the same amount as stage 2.
Mazda Lantis: Corrected the weight from 1993 auto 1240kg to 1996 manual 1200kg.
Mazda Roadster RS '98: Added a full set of upgrade parts, minus an RM, and corrected the upgraded tyre sizes.
Mazda RX-7 Infini III: Fixed the RM being lighter than the intended 900kg limit.
Mitsubishi FTO GR '94: Adjusted the weight reduction parts to prevent stage 3 being the same weight as the full RM.
Mitsubishi FTO GPX '94: Adjusted the weight reduction parts to prevent stage 3 being the same weight as the full RM.
Mitsubishi FTO GR: Adjusted the weight reduction parts to prevent stage 3 being the same weight as the full RM.
Mitsubishi FTO GP version R: Adjusted the weight reduction parts to prevent stage 3 being the same weight as the full RM.
Mitsubishi FTO GPX: Adjusted the weight reduction parts to prevent stage 3 being the same weight as the full RM.
Mitsubishi Galant VR-4: Fixed the AWD torque split being set to 100% front, fixed a typo in the 4th gear ratio.
Mitsubishi GTO '92: Adjusted the wheel inertia reduction on the flywheel parts to avoid a slowdown bug with the RM and high front downforce settings.
Mitsubishi GTO MR '95: Corrected the weight from 1996 1680kg to 1995 1650kg, and adjusted the wheel inertia reduction on the flywheel parts to avoid a slowdown bug with the RM and high front downforce settings.
Mitsubishi GTO SR: Adjusted the wheel inertia reduction on the flywheel parts to avoid a slowdown bug with the RM and high front downforce settings.
Mitsubishi GTO SR '95: Corrected the weight from auto 1650kg to manual 1640kg, and adjusted the wheel inertia reduction on the flywheel parts to avoid a slowdown bug with the RM and high front downforce settings.
Mitsubishi GTO TT: Adjusted the wheel inertia reduction on the flywheel parts to avoid a slowdown bug with the RM and high front downforce settings.
Mitsubishi GTO TT '92: Adjusted the wheel inertia reduction on the flywheel parts to avoid a slowdown bug with the RM and high front downforce settings.
Mitsubishi GTO TT '95: Adjusted the wheel inertia reduction on the flywheel parts to avoid a slowdown bug with the RM and high front downforce settings.
Mitsubishi Lancer Evo III: Fixed the AWD torque split being set to 100% front, fixed the reverse gear ratio being copied from the Evo 4.
Mitsubishi Mirage Asti RX: Corrected the tyre sizes from ZR to RX spec, and corrected the dimensions from 1994 to 1996 values.
Mazda efini RX-7 Touring X: Corrected the power and torque from manual 265PS to auto 255PS.
Mazda efini RX-7 Type R '91: Fixed the engine and dimensions being copied from the 1996 spec cars.
Mazda RX-7 A spec: Fixed the missing downforce values for the stock body.
Nissan Fairlady Z 2by2 Twin Turbo: Corrected the final drive ratio from N/A 4.083 to turbo 3.692.
Nissan Fairlady Z 2seater Twin Turbo: Corrected the final drive ratio from N/A 4.083 to turbo 3.692.
Nissan Primera GT '90: Corrected the weight from auto 1210kg to manual 1170kg.
Nissan Pulsar GTi-R: Fixed the AWD torque split being set to 100% front.
Nissan Silvia K's '95: Corrected the weight from auto 1240kg to manual 1220kg.
Nissan Silvia Q's '95: Corrected the weight from auto 1180kg to manual 1160kg.
Nissan Silvia Q's '96: Fixed the RM making considerably more downforce than the other S14 Silvia variants.
Nissan Skyline GT-R Nismo: Fixed the R32 Nismo using the wider tyres from the later V spec II, fixed the stage 4 turbo kit making less power than the other R32 GT-Rs, and fixed the RM having much more front downforce.
Nissan Skyline GT-R V spec '93: Fixed the R32 V spec using the wider tyres from the later V spec II.
Nissan Skyline GT-R V spec '97: Fixed all four turbo kits making less low-end power than the other R33 GT-Rs.
Nissan Skyline GT-R V spec II: Fixed the stage 4 turbo kit making less power than the other R32 GT-Rs.
Nissan Skyline GTS25 Type S '91: Corrected engine power and torque, and corrected the weight and tyre sizes from GTS-t values to GTS25.
Subaru Impreza WRX '94: Corrected engine power and torque to 260PS / 31.5kgm (swapped with WRX Wagon '94), corrected weight, fixed the length stat being copied from the wagon, fixed the RM being much heavier than the other WRX saloons.
Subaru Impreza WRX '96: Fixed the gear ratios being copied from the 1994 WRX.
Subaru Impreza WRX STI Version II '95: Fixed the RM being much lighter than the other WRX saloons.
Subaru Impreza WRX STI Version III '96: Fixed the gear ratios being copied from the 1994 WRX.
Subaru Impreza WRX STI Version III '96 (Prize): Fixed the gear ratios being copied from the 1994 WRX.
Subaru Impreza WRX Wagon '94: Corrected engine power and torque to 220PS / 28.5kgm (swapped with WRX '94), corrected weight, fixed the RM being lighter than the saloon equivalent.
Subaru Impreza WRX Wagon '96: Fixed a typo in the 2nd gear ratio, fixed the RM being lighter than the saloon equivalent.
Subaru Impreza WRX Wagon STI Version II '95: Fixed the length stat being copied from the saloon, fixed the RM being lighter than the saloon equivalent.
Subaru Impreza WRX Wagon STI Version III '96: Fixed the RM being lighter than the saloon equivalent.
Subaru Legacy Touring Sport RS '93: Corrected the weight from auto 1370kg to manual 1330kg.
Toyota Castrol Supra GT (Prize): Fixed the engine type not matching the normal version of the car.
Toyota Celica GT-Four: Fixed the AWD torque split being set to 100% front.
Toyota Celica SS-II: Fixed the engine making too much top-end power.
Toyota Celica SS-II (Prize): Fixed the weight and quoted power not matching the normal version of the car.
Toyota Chaser LM Edition: Improved response and shifting by using racecar flywheel and clutch settings rather than values copied from the stock Chaser.
Toyota Chaser Tourer S: Corrected the final drive ratio from the Mark II's 4.100 to the correct 4.300.
Toyota Chaser Tourer V: Corrected the sizes of the upgraded tyres.
Toyota Corolla Levin GT-APEX: Remove the 109% power multiplier to match the quoted power figures.
Toyota Corona Exiv: Fixed the engine making too much top-end power.
Toyota Mark II Tourer V: Fixed the rear tyres being much too wide.
Toyota MR2 G-Limited: Fixed the engine making too little top-end power.
Toyota Soarer 2.5 GT-T '95: Corrected the weight from auto 1570kg to manual 1560kg.
Toyota Sprinter Trueno BZG: Fixed a typo in the 3rd gear ratio.
Toyota Sprinter Trueno GT-APEX: Remove the 109% power multiplier to match the quoted power figures.
Toyota Sprinter Trueno GT-APEX (Prize): Remove the 109% power multiplier to match the quoted power figures.
Toyota Supra RZ '95: Fixed the rear tyres being as narrow as the fronts.
Toyota Supra SZ-R '95: Corrected the transmission from a 1996 6-speed to a 1995 5-speed, and fixed the rear tyres being as narrow as the fronts.

- Events
Arcade Class B: Fixed the missing setup of one of the Eunos Roadster opponents causing it to use all of the parts from the FWD Starlet Glanza V.
GT World Cup: Fixed the broken setup of the Celica GT-Four opponent causing it to use all of the parts from the FWD Corona Exiv.

- Menus
A License: Fixed 'mutliple' typo in UK English, and fixed the test names being in title case unlike the other licenses.
Chevrolet dealership: Added the Corvette '67 to the New Car list, and fixed the black Grand Sport and price typo in French.
Chrysler dealership: Reverted the name and logo from the generic Concept Car back to the original Copperhead.
Honda dealership: Reverted the New Car layout to match the Japanese version, re-adding both 1995 CR-X del Sol models.
Mazda dealership: Added the Roadster RS '98 to the New Car list, using the January 1998 MSRP, and fixed the name of the Lantis in French.
Mazdaspeed tuning shop: Fixed a typo in the header of the Others section in English - Mazdzspeed -> Mazdaspeed, and fixed the Computer page in Italian missing the Mazdaspeed branding.
Toyota dealership: Fixed the names for the Chaser Tourer S and Tourer V being swapped in the New Car list.
TVR dealership: Reverted the 'Griffith 4.0' name back to the accurate Blackpool B340 name from the Japanese version.

- Restored or completed cars
Chevrolet Corvette 427 Coupe '67: Purchasable from the Chevrolet New Car dealership (previously Arcade only).
Honda CR-X del Sol SiR: Purchasable from the Honda New Car dealership (previously unavailable).
Honda CR-X del Sol VGi: Purchasable from the Honda New Car dealership (previously unavailable).
Mazda Roadster RS '98: Purchasable from the Mazda New Car dealership (previously Arcade only).

- Additional fixes (currently as Gameshark codes)
Fixed the displayed power for cars in the GT Mode menus being converted to BHP twice, resulting in figures that were too low.
Fixed the displayed power for cars in the pre-race entry list being converted to BHP twice, resulting in figures that were too low.
Fixed the displayed weight for cars in the pre-race entry list mistakenly including a PS to BHP conversion, resulting in figures that were too low.
Fixed the wrong version of the Eunos Roadster being used in license test B-8.
Fixed events with two prize cars often awarding them in a single colour each, by tweaking the RNG value used so that it is closer to a fair split rather than often matching the RNG value for the prize car choice.

Spoiler: Credits

pez2k - Research, tooling, all data, texture, palette, and menu modifications (unless mentioned below)
Leo2236 - Research (model formats), tooling (GT2CarViewer)
Submaniac93 - Research (many areas), QA
Silent - Tooling (mkpsxiso updates)
LameGuy64 - Tooling (mkpsxiso)

Special thanks to TeaKanji, FMecha, commongear, and everyone who mentioned or discovered any issues in GT1 that this mod addresses.

Spoiler: Frequently asked questions (FAQ)

• How do I install the mod? Apply the .xdelta patch to a valid copy of the PAL Gran Turismo disc. Tutorials on how to apply xdelta patches are widely available on Youtube or elsewhere.
• Does the mod work on a real Playstation console? Yes, it should, but has not yet been tested on a Playstation.
• Can I use my normal GT1 savegame? No, the patched game is not compatible with savegames from the base game due to the added and updated content.
• Are you going to add new cars / cars from demos / cars from GT2? This is not yet possible with the current state of research, as GT1 is a lot less moddable than later games.
• Will there be a Complete and Light version like GT2+? Not currently, as any changes to the game design are so far very minimal. Historically, the Light version of GT2+ has also had an adoption rate of less than 10% of users, but doubles the build and testing time for a release.
• Will the mod support the American and Japanese versions of GT1? Yes, in future versions, once enough research has been done to make it work. The Japanese version in particular has differences in its data formats, along with some larger design changes like lighter minimum weights for cars, all of which would need to be straightened out. The PAL version is first as it supports more languages (and is also the disc I owned first!).
• Are you going to add a 60FPS mode? No, this is not possible to do with this mod, and the PS1 console does not have enough power to run the game at that framerate outside of the specially optimised Hi-Fi mode. Mods or cheats that alter the framerate also break replays and ghost cars.
• Are you going to increase the garage size? No, this is not possible, as there is only space in memory and in the savegame for the current number of cars, and adding any more will overwrite critical data.
• Are you going to change (a certain particular detail)? If it is a bug, yes. Otherwise, probably not, as this mod is focusing on bug fixes primarily. However, all of the mod tools used will be openly available so these changes can be made as other mods by other people.
• How do I tell if the mod is working correctly? In GT Mode, check if the Corvette '67 is present in the Chevrolet dealership.

Spoiler: Known issues

Demonstration replays Demo 1 and A-7 desync due to minor physics changes.
The base game issue where the Toyota MR2 GT-S makes slightly too much power has not been fixed, to avoid making license test A-6 more difficult.
The Chevrolet Corvette '67 and Mazda Roadster RS '98 have blank car descriptions in languages other than English.
Savegames and replays from the unmodified game will fail to work properly with the modified game.

Spoiler: Release history

Alpha 1 - 31/12/2023

The PAL release of Gran Turismo is currently supported for this initial alpha version. Other releases may follow in future. Please note that the version bundled with Moto Toon GP 2 is not yet supported, as it's a slightly different version of the disc.

The bugfixcodes.txt file included lists some further bugfixes in the form of code patches formatted as Gameshark cheat codes. These should be compatible with any cheat device that supports Gameshark v2.2+ codes. In later versions these fixes will be built into the mod itself.

Spoiler: Download link

PAL (Europe, Australia, etc.):
PAL (all versions including Platinum, excluding MTGP2 bundle)

Please do not distribute pre-patched disc images of this modification, in order to avoid any potential legal issues or incorrect association with piracy that could result in its removal and/or an end to development.

 

[Indigo Mizumi]

Any chance the Japanese exclusive NSX-R GT1 Turbo will end up in the mod somehow? I did have a few things I'd like to see in a GT1 mod and this checks most of the boxes. I never even expected there to be one simply because the first game just doesn't have as much as the later games do.

How practical is it to tweak what AI cars appear in each event as well? If that's possible I have some ideas there.

 

[pez2k]

Any chance the Japanese exclusive NSX-R GT1 Turbo will end up in the mod somehow?
...
How practical is it to tweak what AI cars appear in each event as well? If that's possible I have some ideas there.

The car list is hardcoded, and I haven't solved how to do code edits yet, so no new cars for now. The Special dealerships only support one car too, so finding a way to give an added racecar to the player is also a problem (especially as prizes are also hardcoded).

Entry lists for events are hardcoded too - a lot of things that were moved to data files in GT2 are in the code instead for GT1. I probably won't tweak the entry lists myself, as most of them are shared between multiple events and need to make sense in all contexts.

I've been working on this mod every now and then for the last four years between GT2+ and other projects, and the current state of research and tooling is enough to do what's in the mod right now. Whenever I figure out how to make permanent code changes then that'll open up the possibility for more advanced tweaks such as making the Dodge Copperhead sellable while still not being buyable.

 

[Indigo Mizumi]

In that case it's clear that what you can do at least for now is pretty limited, even if there wasn't much I'd want to see anyway. If it ever becomes possible it would also be cool to see the cut racing mod for the regular Dodge Copperhead get restored, since that's the only car in the game besides the now former arcade exclusives to lack an RM.

Also, doesn't the Griffith Blackpool have a unique RM in the Japanese version?

 

[pez2k]

If it ever becomes possible it would also be cool to see the cut racing mod for the regular Dodge Copperhead get restored, since that's the only car in the game besides the now former arcade exclusives to lack an RM.

Also, doesn't the Griffith Blackpool have a unique RM in the Japanese version?

The Copperhead RM is possible to do, but the model is too detailed for the final game to handle and freezes on the loading screen of multi-car races. It needs optimisation, which would need car model tools.

The Griffith B340 already has its Japanese RM in this mod for variety, I might have missed that detail from the changelog as it was one of the first tests I did a long time ago. The B340 is exactly as it was in the JP release, while the 500 is as it was in PAL.

 

[Indigo Mizumi]

You did mention the Blackpool being in the mod, you just didn't mention the RM. Then again that RM would have been Japanese exclusive anyway because that model was too.

Also, is it possible to give the Dodge Copperhead some real power upgrades? Even without a racing mod I think it could be a top tier vehicle of you could give it a bit more power.

 

[pez2k]

Also, is it possible to give the Dodge Copperhead some real power upgrades? Even without a racing mod I think it could be a top tier vehicle of you could give it a bit more power.

Possible, but probably outside of the scope of this mod. There are other cars in the 250-270hp range to race it against, and the LM Edition is there as a fast version, so I don't think it was an oversight for it to end up in a relatively low power class.

 

[Dave A]

Awesome work as always @pez2k

 

[Mouc]

Gran Turismo plus (GT1+) is a bugfix and update for Gran Turismo. It fixes outstanding bugs in the game, and restores some cut and unused content.

Currently, as an alpha version, only the PAL version of the game is supported.

Expand any of the spoiler tags below for further information on the mod, or see the included readme file.

Spoiler: Changes from the base game

- Miscellaneous
Fixed the displayed suspension upgrade level for all racecars in the Fitted Parts screen so that it no longer shows up as NEED-JA.HTM.
Fixed several grammatical errors, missing words, and overlapping text in the Fitted Parts screen in English, and tweaked the names to match what is shown in the pre-race menus.
Fixed the Nissan Skyline GT-R in Arcade mode using the logo for the GT-R V spec.
Fixed the Subaru Impreza WRX '94 showing up as the WRX Wagon '94 in the Used Car list, causing the Wagon to be slightly more common and slightly more expensive than intended.
Fixed the Subaru Impreza WRX Wagon '94 showing up as the WRX Wagon STi Version II '95 in the Used Car list, causing the Wagon STi to be much more common and much cheaper than intended.
Fixed the Subaru Impreza WRX STi Version II '95 showing up as the WRX '94 in the Used Car list, causing the WRX to be much rarer and much more expensive than intended, as well as never being available in Black Mica or Cosmic Blue.
Fixed the Subaru Impreza WRX Wagon STi Version II '95 showing up as the WRX STi Version II '95 in the Used Car list, causing the STi to be slightly rarer and slightly cheaper than intended.
Fixed a typo in the pause menu in Italian - USICITA -> USCITA.

- Audio
Nissan Silvia Q's '95: Switched to a Silvia engine sound like the other S14s instead of a Skyline sound.
Nissan Silvia Q's '96: Switched to a Silvia engine sound like the other S14s instead of a Skyline sound.

- Models / Textures
Dodge Copperhead: Fixed texture error on rear deck.
Dodge Copperhead RM: Fixed texture error on rear deck.
Dodge Viper GTS: Corrected the stripes on the rear from 1996 spec to 1997 spec.
Honda Civic Ferio '96 RM: Fixed texture spike in the rear wheelarches.
Honda NSX: Fixed the rear wing being warped at night.
Honda NSX '90: Fixed the rear wing being warped at night.
Honda NSX '90 RM: Fixed various UV mapping asymmetries and warping on both the day and night models.
Honda NSX Type R: Fixed the rear wing being warped at night, and removed the Quasar Gray, Cranberry Red, Estoril Turquoise, Bay Leaf Green, and Monte Carlo Blue colours copied from the NSX '90 but never offered on the Type R.
Honda NSX Type R RM: Fixed various UV mapping asymmetries and warping on both the day and night models.
Honda NSX Type S: Fixed the rear wing being warped at night.
Honda NSX Type S Zero: Fixed the rear wing being warped at night.
Mazda RX-7 Infini III RM: Fixed the stripe colours on the rear not matching the rest of the car, especially the blue and red version.
Nissan Skyline GTS-4 '91: Replaced the 2-door coupe car model with a 4-door saloon to match the weight, dimensions, and car description, and to make it more unique.
Subaru Impreza Rally Car: Fixed leftover blue paint on black version, fixed inverted grille texture when viewed from a distance.
Subaru Impreza WRX '94 RM: Fixed 'SURARU' typo on the rear.
Subaru Impreza WRX '96 RM: Fixed 'SURARU' typo on the rear.
Subaru Impreza WRX STi Version II '95 RM: Fixed 'SURARU' typo on the rear.
Subaru Impreza WRX STi Version III '96 RM: Fixed 'SURARU' typo on the rear.
Subaru Impreza WRX STi Version III '96 (Prize) RM: Fixed 'SURARU' typo on the rear.
Subaru Impreza WRX type R STi RM: Fixed 'SURARU' typo on the rear.
Toyota Supra GT Turbo Limited RM: Fixed a hole in the rear bumper on the black colour.

- Text
Aston Martin DB7: Updated the colour names to the real names used in GT2.
Aston Martin DB7 Volante: Updated the colour names to the real names used in GT2.
Chevrolet Corvette 427 Coupe '67: Wrote a car description to prevent crashes (English only so far, blank in other languages).
Dodge Copperhead: Reverted the name and logo from the generic Concept Car back to the original Copperhead.
Dodge Viper GTS: Updated the colour names to the real names, and fixed a typo in the car description - 1.8-litre -> 8-litre.
Dodge Viper RT/10: Updated the colour names to the real names, and fixed a typo in the car description - 1.8-litre -> 8-litre.
Eunos Cosmo Type-E: Fixed typos in the car description - Cosmos -> Cosmo, rotar -> rotor, first twin-rotor -> first 3-rotor.
Eunos Cosmo Type-S: Fixed typos in the car description - Cosmos -> Cosmo, rotar -> rotor, first twin-rotor -> first 3-rotor.
Eunos Roadster (Prize): Added the missing model name to match the original car.
Eunos Roadster S Special: Fixed a typo in a paint colour - Melrot -> Merlot.
Honda Accord SiR: Fixed punctuation errors in the Taffetas White and San Marino Red paint colours.
Honda Civic SiR-II '93: Fixed typos in the English and Italian car descriptions - Sports civic -> sports Civic / sportiva Civic.
Honda Civic Type R: Fixed punctuation errors in the English car description, and fixed a punctuation error in the Starlight Black Pearl paint colour.
Honda Integra SiR-G: Fixed a punctuation error in the Starlight Black Pearl paint colour.
Honda Integra Type R: Fixed a punctuation error in the Starlight Black Pearl paint colour.
Honda NSX '90: Fixed punctuation errors in the Grand Prix White and Bay Leaf Green paint colours, and fixed a mistranslated paint colour - Shallot -> Charlotte.
Honda NSX '97: Fixed punctuation errors in the Grand Prix White and Grand Prix Red paint colours.
Honda NSX Type R: Fixed a punctuation error in the Grand Prix White paint colour, and fixed a mistranslated paint colour - Shallot -> Charlotte.
Honda NSX Type S: Fixed punctuation errors in the Grand Prix White and Grand Prix Red paint colours.
Honda NSX Type S Zero: Fixed punctuation errors in the Grand Prix White and Grand Prix Red paint colours.
Honda Prelude SiR: Fixed punctuation errors in the Taffetas White and San Marino Red paint colours.
Honda Prelude Type S: Fixed punctuation errors in the Taffetas White and San Marino Red paint colours.
Mazda Demio LX: Fixed punctuation errors in the English car description.
Mazda Demio GL: Fixed punctuation errors in the English car description.
Mazda Demio GL-X: Fixed punctuation errors in the English car description, and fixed a typo in a paint colour - Metalic -> Metallic.
Mazda Roadster RS '98: Removed the Eunos branding as it was not used from 1998 onwards, and wrote a car description to prevent crashes (English only so far, blank in other languages).
Mazda RX-7 Infini III: Added the missing 'Infini' name.
Mitsubishi FTO GPX: Fixed a typo in a paint colour: Kilder -> Kielder.
Mitsubishi FTO GR: Fixed a typo in a paint colour: Kilder -> Kielder.
Mitsubishi Mirage Asti RX: Fixed a typo in a paint colour: Kilder -> Kielder.
Mitsubishi Mirage Cyborg ZR: Fixed typos in paint colours - Corse Gray -> Coarse Gray, Champagnish Yellow -> Champagne Yellow, Sainto Amour Green -> Saint Amour Green.
Nissan Silvia Q's '88 (Prize): Added the missing model year to match the original car.
Nissan Skyline GTS-4 '91: Fixed typos in the car description - RB20DETT -> RB20DE, GTS M-Type -> GTS25.
Nissan Skyline GTS-t Type M '91: Fixed typos in the car description - RB20DETT -> RB20DE, GTS M-Type -> GTS25.
Nissan Skyline GTS25 Type S '91: Fixed typos in the car description - RB20DETT -> RB20DE, GTS M-Type -> GTS25.
Nissan Skyline GTS25t: Fixed a punctuation error in the Super Clear Red II paint colour.
Nissan Skyline GT-R '89: Fixed punctuation errors and a typo in the car description - calliper -> caliper.
Nissan Skyline GT-R '91: Fixed punctuation errors and a typo in the car description - calliper -> caliper.
Nissan Skyline GT-R '95: Fixed a punctuation error in the Super Clear Red II paint colour.
Nissan Skyline GT-R '97: Fixed a punctuation error in the Super Clear Red II paint colour.
Nissan Skyline GT-R Nismo '90: Fixed punctuation errors and a typo in the car description - calliper -> caliper.
Nissan Skyline GT-R V spec '93: Fixed punctuation errors and a typo in the car description - calliper -> caliper.
Nissan Skyline GT-R V spec '95: Fixed a punctuation error in the Super Clear Red II paint colour.
Nissan Skyline GT-R V spec '97: Fixed a punctuation error in the Super Clear Red II paint colour.
Nissan Skyline GT-R V spec II '94: Fixed punctuation errors and a typo in the car description - calliper -> caliper.
Subaru Alcyone SVX S4: Fixed the name in the car description being typoed as 'Alshione' in all five PAL languages.
Subaru Alcyone SVX Version L: Fixed the name in the car description being typoed as 'Alshione' in all five PAL languages.
Subaru Impreza WRX '94: Fixed the replay name being swapped with another WRX model, and fixed the car using a WRX STi description instead of WRX.
Subaru Impreza WRX STi Version II '95: Fixed the replay name being swapped with another WRX model.
Subaru Impreza WRX Wagon '94: Fixed the replay name being swapped with another WRX model.
Subaru Impreza WRX Wagon STi Version II '95: Fixed the replay name being swapped with another WRX model, and fixed the car using a WRX description instead of WRX STi.
Toyota Celica GT-Four: Fixed a punctuation error in the Super White II paint colour.
Toyota Celica SS-II: Fixed a punctuation error in the Super White II paint colour.
Toyota Chaser Tourer S: Fixed punctuation errors in the Super White II and Dark Green Mica P.I.O. paint colours.
Toyota Chaser Tourer V: Fixed punctuation errors in the Super White II and Dark Green Mica P.I.O. paint colours.
Toyota Corona Exiv: Fixed typos in the car description - Exive / Exi V -> Exiv, SS-111 -> SS-III.
Toyota Mark 2 Tourer S: Fixed punctuation errors in the Super White II and Dark Green M.I.O. paint colours.
Toyota Mark 2 Tourer V: Fixed punctuation errors in the Super White II and Dark Green M.I.O. paint colours.
Toyota MR2 G-Limited: Fixed a punctuation error in the Super White II paint colour.
Toyota MR2 GTS: Fixed a punctuation error in the Super White II paint colour.
Toyota Soarer 2.5 GT-T '95: Fixed a typo in a colour name: Phtalocyanine -> Phthalocyanine.
Toyota Supra SZ-R: Fixed a punctuation error in the Super White II paint colour.
Toyota Supra RZ: Fixed a punctuation error in the Super White II paint colour.
Toyota Supra SZ-R '95: Fixed a punctuation error in the Super White II paint colour.
Toyota Supra RZ '95: Fixed a punctuation error in the Super White II paint colour.
Toyota Supra Twinturbo R: Fixed punctuation errors in the English car description.
TVR Griffith Blackpool B340: Reverted the 'Griffith 4.0' name back to the accurate Blackpool B340 name from the Japanese version.

- Upgrades / Physics / Stats
Aston Martin DB7: Corrected the final drive ratio to 3.545:1, increasing top speed dramatically.
Aston Martin DB7 (Prize): Corrected the final drive ratio to 3.545:1, increasing top speed dramatically.
Aston Martin DB7 Volante: Corrected the final drive ratio to 3.545:1, increasing top speed dramatically.
Chevrolet Corvette 427 Coupe '67: Added a full set of upgrade parts, minus an RM, corrected the upgraded tyre sizes, and corrected the rear suspension type.
Eunos Roadster '89: Fixed the weight and dimensions copied from the later 1.8-litre equivalent, and corrected mismatched wheel sizes with upgraded tyres.
Eunos Roadster: Corrected mismatched wheel sizes with upgraded tyres.
Eunos Roadster (Prize): Corrected mismatched wheel sizes with upgraded tyres.
Eunos Roadster S-Special '92: Fixed the weight and dimensions copied from the later 1.8-litre equivalent, and corrected mismatched wheel sizes with upgraded tyres.
Eunos Roadster S-Special: Fixed the mismatched base 14" wheels on the front and S-Special 15" wheels on the back.
Eunos Roadster V-Special '90: Fixed the weight and dimensions copied from the later 1.8-litre equivalent, and corrected mismatched wheel sizes with upgraded tyres.
Eunos Roadster V-Special: Corrected mismatched wheel sizes with upgraded tyres.
Honda Accord SiR '96: Corrected the weight from auto 1320kg to manual 1290kg, fixed the width stat copied from the wagon.
Honda Civic Ferio '93: Fixed the car making too little power.
Honda Civic SiR II '93: Corrected the weight from SiR 1040kg to SiR II 1050kg, and fixed the car making too little power and compensating for it with a power multiplier, resulting in too much torque.
Honda Civic SiR II: Corrected the weight to 1080kg.
Honda CR-X del Sol SiR '92: Corrected the weight to 1110kg.
Honda Integra SiR-G: Corrected the weight from auto 1120kg to manual 1100kg.
Honda Integra Type R: Corrected the weight and dimensions from saloon values to a coupe to match the model.
Honda NSX '90: Corrected the tyre sizes, as they had been copied from the '97, and adjusted the RM weight to be slightly heavier than the other NSX models.
Honda NSX '97: Adjusted the RM weight to be slightly heavier than the other NSX models.
Honda NSX Type R: Fixed the final drive ratio and tyre sizes being copied from the base '96, fixed the height stat not taking into account the lower Type R suspension, and adjusted the WR 3 and RM weights to remain lighter than the Type S and base NSX, instead of up to 80kg heavier.
Honda NSX Type S: Adjusted the RM weight to be slightly lighter than the base NSX instead of much heavier.
Honda NSX Type S Zero: Adjusted the RM weight to be slightly lighter than the adjusted Type S RM.
Honda Prelude '91: Corrected the weight from 1993 1240kg to 1991 1230kg.
Honda Prelude VTEC '91: Corrected the weight from auto 1290kg to manual 1260kg, and fixed the car making 15PS too much power.
Mazda Demio A spec: Fixed the stage 1 turbo costing the same amount as stage 2.
Mazda Demio LX: Adjusted the weight reduction parts to prevent stage 3 being lighter than the full RM, and fixed the stage 1 turbo costing the same amount as stage 2.
Mazda Demio GL: Adjusted the weight reduction parts to prevent stage 3 being lighter than the full RM, and fixed the stage 1 turbo costing the same amount as stage 2.
Mazda Demio GL-X: Adjusted the weight reduction parts to prevent stage 3 being lighter than the full RM, and fixed the stage 1 turbo costing the same amount as stage 2.
Mazda Lantis: Corrected the weight from 1993 auto 1240kg to 1996 manual 1200kg.
Mazda Roadster RS '98: Added a full set of upgrade parts, minus an RM, and corrected the upgraded tyre sizes.
Mazda RX-7 Infini III: Fixed the RM being lighter than the intended 900kg limit.
Mitsubishi FTO GR '94: Adjusted the weight reduction parts to prevent stage 3 being the same weight as the full RM.
Mitsubishi FTO GPX '94: Adjusted the weight reduction parts to prevent stage 3 being the same weight as the full RM.
Mitsubishi FTO GR: Adjusted the weight reduction parts to prevent stage 3 being the same weight as the full RM.
Mitsubishi FTO GP version R: Adjusted the weight reduction parts to prevent stage 3 being the same weight as the full RM.
Mitsubishi FTO GPX: Adjusted the weight reduction parts to prevent stage 3 being the same weight as the full RM.
Mitsubishi Galant VR-4: Fixed the AWD torque split being set to 100% front, fixed a typo in the 4th gear ratio.
Mitsubishi GTO '92: Adjusted the wheel inertia reduction on the flywheel parts to avoid a slowdown bug with the RM and high front downforce settings.
Mitsubishi GTO MR '95: Corrected the weight from 1996 1680kg to 1995 1650kg, and adjusted the wheel inertia reduction on the flywheel parts to avoid a slowdown bug with the RM and high front downforce settings.
Mitsubishi GTO SR: Adjusted the wheel inertia reduction on the flywheel parts to avoid a slowdown bug with the RM and high front downforce settings.
Mitsubishi GTO SR '95: Corrected the weight from auto 1650kg to manual 1640kg, and adjusted the wheel inertia reduction on the flywheel parts to avoid a slowdown bug with the RM and high front downforce settings.
Mitsubishi GTO TT: Adjusted the wheel inertia reduction on the flywheel parts to avoid a slowdown bug with the RM and high front downforce settings.
Mitsubishi GTO TT '92: Adjusted the wheel inertia reduction on the flywheel parts to avoid a slowdown bug with the RM and high front downforce settings.
Mitsubishi GTO TT '95: Adjusted the wheel inertia reduction on the flywheel parts to avoid a slowdown bug with the RM and high front downforce settings.
Mitsubishi Lancer Evo III: Fixed the AWD torque split being set to 100% front, fixed the reverse gear ratio being copied from the Evo 4.
Mitsubishi Mirage Asti RX: Corrected the tyre sizes from ZR to RX spec, and corrected the dimensions from 1994 to 1996 values.
Mazda efini RX-7 Touring X: Corrected the power and torque from manual 265PS to auto 255PS.
Mazda efini RX-7 Type R '91: Fixed the engine and dimensions being copied from the 1996 spec cars.
Mazda RX-7 A spec: Fixed the missing downforce values for the stock body.
Nissan Fairlady Z 2by2 Twin Turbo: Corrected the final drive ratio from N/A 4.083 to turbo 3.692.
Nissan Fairlady Z 2seater Twin Turbo: Corrected the final drive ratio from N/A 4.083 to turbo 3.692.
Nissan Primera GT '90: Corrected the weight from auto 1210kg to manual 1170kg.
Nissan Pulsar GTi-R: Fixed the AWD torque split being set to 100% front.
Nissan Silvia K's '95: Corrected the weight from auto 1240kg to manual 1220kg.
Nissan Silvia Q's '95: Corrected the weight from auto 1180kg to manual 1160kg.
Nissan Silvia Q's '96: Fixed the RM making considerably more downforce than the other S14 Silvia variants.
Nissan Skyline GT-R Nismo: Fixed the R32 Nismo using the wider tyres from the later V spec II, fixed the stage 4 turbo kit making less power than the other R32 GT-Rs, and fixed the RM having much more front downforce.
Nissan Skyline GT-R V spec '93: Fixed the R32 V spec using the wider tyres from the later V spec II.
Nissan Skyline GT-R V spec '97: Fixed all four turbo kits making less low-end power than the other R33 GT-Rs.
Nissan Skyline GT-R V spec II: Fixed the stage 4 turbo kit making less power than the other R32 GT-Rs.
Nissan Skyline GTS25 Type S '91: Corrected engine power and torque, and corrected the weight and tyre sizes from GTS-t values to GTS25.
Subaru Impreza WRX '94: Corrected engine power and torque to 260PS / 31.5kgm (swapped with WRX Wagon '94), corrected weight, fixed the length stat being copied from the wagon, fixed the RM being much heavier than the other WRX saloons.
Subaru Impreza WRX '96: Fixed the gear ratios being copied from the 1994 WRX.
Subaru Impreza WRX STI Version II '95: Fixed the RM being much lighter than the other WRX saloons.
Subaru Impreza WRX STI Version III '96: Fixed the gear ratios being copied from the 1994 WRX.
Subaru Impreza WRX STI Version III '96 (Prize): Fixed the gear ratios being copied from the 1994 WRX.
Subaru Impreza WRX Wagon '94: Corrected engine power and torque to 220PS / 28.5kgm (swapped with WRX '94), corrected weight, fixed the RM being lighter than the saloon equivalent.
Subaru Impreza WRX Wagon '96: Fixed a typo in the 2nd gear ratio, fixed the RM being lighter than the saloon equivalent.
Subaru Impreza WRX Wagon STI Version II '95: Fixed the length stat being copied from the saloon, fixed the RM being lighter than the saloon equivalent.
Subaru Impreza WRX Wagon STI Version III '96: Fixed the RM being lighter than the saloon equivalent.
Subaru Legacy Touring Sport RS '93: Corrected the weight from auto 1370kg to manual 1330kg.
Toyota Castrol Supra GT (Prize): Fixed the engine type not matching the normal version of the car.
Toyota Celica GT-Four: Fixed the AWD torque split being set to 100% front.
Toyota Celica SS-II: Fixed the engine making too much top-end power.
Toyota Celica SS-II (Prize): Fixed the weight and quoted power not matching the normal version of the car.
Toyota Chaser LM Edition: Improved response and shifting by using racecar flywheel and clutch settings rather than values copied from the stock Chaser.
Toyota Chaser Tourer S: Corrected the final drive ratio from the Mark II's 4.100 to the correct 4.300.
Toyota Chaser Tourer V: Corrected the sizes of the upgraded tyres.
Toyota Corolla Levin GT-APEX: Remove the 109% power multiplier to match the quoted power figures.
Toyota Corona Exiv: Fixed the engine making too much top-end power.
Toyota Mark II Tourer V: Fixed the rear tyres being much too wide.
Toyota MR2 G-Limited: Fixed the engine making too little top-end power.
Toyota Soarer 2.5 GT-T '95: Corrected the weight from auto 1570kg to manual 1560kg.
Toyota Sprinter Trueno BZG: Fixed a typo in the 3rd gear ratio.
Toyota Sprinter Trueno GT-APEX: Remove the 109% power multiplier to match the quoted power figures.
Toyota Sprinter Trueno GT-APEX (Prize): Remove the 109% power multiplier to match the quoted power figures.
Toyota Supra RZ '95: Fixed the rear tyres being as narrow as the fronts.
Toyota Supra SZ-R '95: Corrected the transmission from a 1996 6-speed to a 1995 5-speed, and fixed the rear tyres being as narrow as the fronts.

- Events
Arcade Class B: Fixed the missing setup of one of the Eunos Roadster opponents causing it to use all of the parts from the FWD Starlet Glanza V.
GT World Cup: Fixed the broken setup of the Celica GT-Four opponent causing it to use all of the parts from the FWD Corona Exiv.

- Menus
A License: Fixed 'mutliple' typo in UK English, and fixed the test names being in title case unlike the other licenses.
Chevrolet dealership: Added the Corvette '67 to the New Car list, and fixed the black Grand Sport and price typo in French.
Chrysler dealership: Reverted the name and logo from the generic Concept Car back to the original Copperhead.
Honda dealership: Reverted the New Car layout to match the Japanese version, re-adding both 1995 CR-X del Sol models.
Mazda dealership: Added the Roadster RS '98 to the New Car list, using the January 1998 MSRP, and fixed the name of the Lantis in French.
Mazdaspeed tuning shop: Fixed a typo in the header of the Others section in English - Mazdzspeed -> Mazdaspeed, and fixed the Computer page in Italian missing the Mazdaspeed branding.
Toyota dealership: Fixed the names for the Chaser Tourer S and Tourer V being swapped in the New Car list.
TVR dealership: Reverted the 'Griffith 4.0' name back to the accurate Blackpool B340 name from the Japanese version.

- Restored or completed cars
Chevrolet Corvette 427 Coupe '67: Purchasable from the Chevrolet New Car dealership (previously Arcade only).
Honda CR-X del Sol SiR: Purchasable from the Honda New Car dealership (previously unavailable).
Honda CR-X del Sol VGi: Purchasable from the Honda New Car dealership (previously unavailable).
Mazda Roadster RS '98: Purchasable from the Mazda New Car dealership (previously Arcade only).

- Additional fixes (currently as Gameshark codes)
Fixed the displayed power for cars in the GT Mode menus being converted to BHP twice, resulting in figures that were too low.
Fixed the displayed power for cars in the pre-race entry list being converted to BHP twice, resulting in figures that were too low.
Fixed the displayed weight for cars in the pre-race entry list mistakenly including a PS to BHP conversion, resulting in figures that were too low.
Fixed the wrong version of the Eunos Roadster being used in license test B-8.
Fixed events with two prize cars often awarding them in a single colour each, by tweaking the RNG value used so that it is closer to a fair split rather than often matching the RNG value for the prize car choice.

Spoiler: Credits

pez2k - Research, tooling, all data, texture, palette, and menu modifications (unless mentioned below)
Leo2236 - Research (model formats), tooling (GT2CarViewer)
Submaniac93 - Research (many areas), QA
Silent - Tooling (mkpsxiso updates)
LameGuy64 - Tooling (mkpsxiso)

Special thanks to TeaKanji, FMecha, commongear, and everyone who mentioned or discovered any issues in GT1 that this mod addresses.

What - a - list. Very impressive. Great great great work.
Massive thanks to all for this!

 

[m2595]

As I mentioned in the GT2 Plus thread, I'm glad that you gave the GT1 the same treatment as well, it deserves it. So thank you!
BTW I didn't expect GT1 to have that much stuff, even if it's mostly little things, that weren't done properly by Polyphony. Still, it's a much more polished game than GT2, no doubt about that.
On another note - is there any kind of missing or not finished stuff that could be added back to GT1 like missing cars, etc.? I really don't know and couldn't find any info about that.

P.S: Can't wait for the NTSC-J version, it's my favourite one and dearest to my heart, I started my Gran Turismo "career" with it back in '98.

 

[pez2k]

On another note - is there any kind of missing or not finished stuff that could be added back to GT1 like missing cars, etc.? I really don't know and couldn't find any info about that.

Other than the NSX-R GT1 Turbo from the JP version (that was replaced by the GT2 car with the same physics but less top-end power) and the Copperhead RM, as far as I'm aware there are just the two non-turbo Skylines that exist only as a snippet of physics data, the same two that I've previously shown recreations of for GT2+. It's not possible to add any of that stuff to GT1 currently though, which is why alpha 1 includes everything unused on the disc and not any other restored / recreated content.

I don't expect this mod to ever have as wide a scope as GT2+ to be honest - GT1 is much less moddable. The main focus was on making the C2 and NB usable in GT mode, fixing the inaccessible del Sols, and fixing the most detrimental physics issues like the FWD Evo 3 and the crippling slowdown on the tuned GTOs. Everything else was spotted along the way or found in antique bug report threads.

 

[Indigo Mizumi]

Other than the NSX-R GT1 Turbo from the JP version (that was replaced by the GT2 car with the same physics but less top-end power) and the Copperhead RM, as far as I'm aware there are just the two non-turbo Skylines that exist only as a snippet of physics data, the same two that I've previously shown recreations of for GT2+. It's not possible to add any of that stuff to GT1 currently though, which is why alpha 1 includes everything unused on the disc and not any other restored / recreated content.

I don't expect this mod to ever have as wide a scope as GT2+ to be honest - GT1 is much less moddable. The main focus was on making the C2 and NB usable in GT mode, fixing the inaccessible del Sols, and fixing the most detrimental physics issues like the FWD Evo 3 and the crippling slowdown on the tuned GTOs. Everything else was spotted along the way or found in antique bug report threads.

Even if the first game was more moddable I wouldn't expect this mod to have as wide of a scope as mods for later games anyway, simply because there's less content in the game. There are a few other ideas I have but there wouldn't be much.

Is it possible to make the special color cars eligible for the Lightweight Cup? Cause the game counts them as separate vehicles. Also, is it possible to fix the "global parts" glitch where buying two of the same car makes the tuning parts on one accessible on both?

 

[mistamontiel]

Any hopes of patch/selector to 60hz? Playing with original hardware

 

[pez2k]

Is it possible to make the special color cars eligible for the Lightweight Cup? Cause the game counts them as separate vehicles. Also, is it possible to fix the "global parts" glitch where buying two of the same car makes the tuning parts on one accessible on both?

Entry lists are hardcoded, so not currently possible to change. The shared parts pool is by design so I won't be changing it, but either way it'd be a code change so not currently possible.

Any hopes of patch/selector to 60hz? Playing with original hardware

The game will generally not run at 60fps on original hardware - see the FAQ in the first post. It'd also be a code change, so not currently possible.

 

[Sal_89]

Made a quick preview about the added cars in GT Mode

 

[m2595]

There's two more bugs in vanilla that I know of - the R33 GTS25t Type M has incorrect NISMO license plates and the Integra Type R has issues with its rear light textures when the brake lights are on and/or on night courses: small white lines appear above the rear indicators, they are not there when the brake lights are off and/or on daylight courses.

 

[Mouc]

What's really cool about the "new" '67 Corvette & all optional parts is that we can now tackle the Megaspeed, the Tuned Car Cup, & maybe some endurance events

 

[mistamontiel]

Oh but to be certain I mean hz not framerate. I can't hang with 50

 

[Indigo Mizumi]

What's really cool about the "new" '67 Corvette & all optional parts is that we can now tackle the Megaspeed, the Tuned Car Cup, & maybe some endurance events

I wonder how it would do in the Normal Car Cup. It's powerful but wouldn't handle as well as a Viper.

Oh but to be certain I mean hz not framerate. I can't hang with 50

In this case hertz is the frame rate.

 

[Mouc]

I wonder how it would do in the Normal Car Cup. It's powerful but wouldn't handle as well as a Viper.

Hi,
The old Corvette is really overpowered compared to the other AI cars, so it's quite easy to win the championship despite "poor" handling

 

[submaniac93]

The question is more along the lines of would it beat the Viper or the TVRs in how quickly it can beat the Normal Cup lol

 

[pez2k]

There's two more bugs in vanilla that I know of - the R33 GTS25t Type M has incorrect NISMO license plates and the Integra Type R has issues with its rear light textures when the brake lights are on and/or on night courses: small white lines appear above the rear indicators, they are not there when the brake lights are off and/or on daylight courses.

I'm not that bothered about the plates on the R33 as they're so low-res as to be barely readable and the car that PD modelled does seem to have a handful of optional parts on it from Nismo press photos. Good spot on the Integra though, I suspect it's just a simple mistake in the palette.

What's really cool about the "new" '67 Corvette & all optional parts is that we can now tackle the Megaspeed, the Tuned Car Cup, & maybe some endurance events

Definitely - I've already seen some cool feats pulled off with the Roadster too despite its relatively low power output and lack of a RM. The tuned Corvette is intentionally a car for experts too - keeping to the game' unwritten rules about tyre size upgrades means that it only gets 205mm wide race tyres, and upgraded but not tuned it still has short gearing and tall suspension like the unmodified car. With enough tweaking though, it should be fun!

Oh but to be certain I mean hz not framerate. I can't hang with 50

If you mean a PAL to NTSC conversion, then no - wait for a NTSC version of the mod in the future. If you mean PAL 60Hz, I don't know if an unmodified PS1 can even output that, and I suspect it would break a massive number of assumptions about frame times in the game's code. Very much not feasible.

Hi,
The old Corvette is really overpowered compared to the other AI cars, so it's quite easy to win the championship despite "poor" handling

I did wonder whether I should tone back the high grip multiplier it carries over from Arcade mode (even higher than the Vipers), but I think for players without your skill level it's probably needed. Either way, it's deliberately priced higher than any road car other than the Astons to incentivise more casual players to buy something that's easier to drive fast, but also not too expensive so that someone who really wants to have a go with it can still afford it.

Unlike the Roadster which simply uses the advertised January 1998 price for the car to match the other new cars, there wasn't much context for what a 7-litre classic Corvette would be worth in late 90s Japan!

 

[Mouc]

[...]
Definitely - I've already seen some cool feats pulled off with the Roadster too despite its relatively low power output and lack of a RM. The tuned Corvette is intentionally a car for experts too - keeping to the game' unwritten rules about tyre size upgrades means that it only gets 205mm wide race tyres, and upgraded but not tuned it still has short gearing and tall suspension like the unmodified car. With enough tweaking though, it should be fun! [...]

About the Roadster RS I agree, this car works really well. Could it be relied to the "grip multiplier" you describe below?
Agreed also 'bout the Vette, I think one can "master" it after multiple hours of game only.

[...]
I did wonder whether I should tone back the high grip multiplier it carries over from Arcade mode (even higher than the Vipers), but I think for players without your skill level it's probably needed. Either way, it's deliberately priced higher than any road car other than the Astons to incentivise more casual players to buy something that's easier to drive fast, but also not too expensive so that someone who really wants to have a go with it can still afford it.

Unlike the Roadster which simply uses the advertised January 1998 price for the car to match the other new cars, there wasn't much context for what a 7-litre classic Corvette would be worth in late 90s Japan!

Good choice I think. By the way it makes me think that the Viper should be a bit harder to drive... It's clearly a game killer, those Dodges .
And thanks for your kind words, but I use more the A.I.'s mistakes than my "skills" in this game!

The question is more along the lines of would it beat the Viper or the TVRs in how quickly it can beat the Normal Cup lol

Ok, my bad. With clean driving like YOU do, it deserves to be tested... I guess the Vette could be something as fast as the TVRs?

 

[pez2k]

About the Roadster RS I agree, this car works really well. Could it be relied to the "grip multiplier" you describe below?

The RS has the same grip level as most other cars (a value of 135, no idea what the units are). The Vipers have a value of 140, and the C2 Vette has 167 - I assume this is to make their level of power a bit easier to control when they have normal road tyres.

I think what makes the RS quick is probably that it has the the wider tyres of the fastest NA Roadsters, but also a bit more power and an extra gear (7 of them with a semi-racing transmission). It's a bit heavier, but I don't know if it's enough to matter.

 

[EncounterGTR]

Will you fix the incorrect price of the Lancer Evo 4?
It should be around 30k, but in the game is around 24k.
Also there is a bug with the NSX (3.2), for some reason when you equip it with differents tyres rather the stock, they will get longer gear ratios.

 

[pez2k]

Will you fix the incorrect price of the Lancer Evo 4?
It should be around 30k, but in the game is around 24k.
Also there is a bug with the NSX (3.2), for some reason when you equip it with differents tyres rather the stock, they will get longer gear ratios.

Yeah, looks like a mistake with the price of the Evo, I'll add it to the to-do list.

Tyres can't affect the gear ratios of a car in GT1 directly, but upgraded tyres are often a larger diameter and the 3.2-litre NSXes have that worse than anything else due to the massive size increase of the rears. Not really much I can do about it other than give it smaller tyres, but that would hurt its performance.

 

[m2595]

The Corvette is definitely faster than both TVR Griffiths, probably the Cerbera too - for example, I'm lapping the Autumn ring-Mini roughly 1 - 1.5 seconds faster in the Corvette. I just tested that out in the Normal Cup. The Viper is just slightly faster than it, though.
BTW, the Corvette drives nice, I like it, the only issue I have with it is that the rear breaks loose during hard braking - I have to turn on my "human" ABS by rapidly tapping the brakes in order to control it lol

P.S: That 427 is way faster in-game than the real-life car - I'm consistenly clocking 11.8s quarter-mile times, the real 427 did it in 13.8. I also checked out a few other cars like the R33GT-R to see if there is such a big difference as well, but they all posted basically the same quarter-mile times as their real-life counterparts (13.1s for the GT-R in-game). Probably has something to do with the increased grip levels, but it's still a big difference.

 

[m2595]

Evo IV price is the same across all versions of GT1. After searching in some ancient Japanese car sites I found out a 2,998,000 yen (which would equal 29,998 credits in NTSC-U/PAL versions) listing price for a new car back in 1996. It's not mentioned if that price is for a full-specced or base GSR, though. So it is indeed wrong. The real-life RS is the one that costs around 2,400,000 yen, I guess Polyphony mistakenly took that one and used it for the GSR in-game.

 

[matherto]

So I can't get past the menu screen. Pressing Gran Turismo mode just results in nothing happening?

 

[pez2k]

So I can't get past the menu screen. Pressing Gran Turismo mode just results in nothing happening?

Going to need a bit more detail than that I'm afraid - did the patch apply properly (verify the patched image against the CRC in the readme file)? Does the unpatched game work correctly? What platform are you running the game on?