back yard special tuning. *update - 94' Skyline GT-R V.spec II*

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bys

bys

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New Zealand
Germany
bys
5588342747_6ce9a0889f_o.jpg



Introduction
Introducing a fresh virtual tuning garage "Back Yard Special". The honda enthusiasts among you might recognise the "BYS" brand, as the name is lifted from a (not so well known) japanese honda tuning garage. And therein lies my history with cars - I owned a Honda Integra DC2 SiR, I bought it standard, modified it and put it through it's paces on several track days. Through the NZ Honda club, friends and family I have some exposure to (mostly Japanese) performance cars and that will probably bleed over to the cars and type of tuning carried out.​


Tuning Rig & Set up
Hardware & Settings: All tuning will be carried out on a "Logitech Driving Force GT" with manual transmission. Tunes will generally not be tested on the DS3, so you may find the tunes a little touchy without the steering, throttle and brake control that steering wheels and pedals allow.​


Circuits: As you have probably guessed from my banner, I enjoy racing on the Tsukuba circuit. This track is one of many used for "Time Attack" or "Tuner Battles" in Japan. The track itself provides a good mix of low and high speed corners and as it's quite short - allows for quick turn arounds on tunes. Typically, any car capable of lapping Tsukuba under 60 seconds is anything but slow.​

More often than not I will also try my tunes out on other tracks such as the Suzuka or Laguna Seca circuits. Lastly, I will always try to compare my times to those from the real world when available.​

Comments: The layouts of the tunes themselves will be as follows; a brief introduction to the car, parts-list, settings/tune, results (lap times and real world comparisons) and finally some comments & tips on the car & tune. Also each car and tune will receive a [beginner], [intermediate] or [skilled] mark depending on the driver skill required to handle the car & tune.​


The Tunes
[beginner]

[intermediate]




[skilled]



​
 
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"Killer Bee" 97' Civic Type-R
[intermediate]

5591367611_1202d99996.jpg


Introduction:
Improving on the already successful EK4 civic, Honda engineers designed the EK9 with circuit racing in mind. The naturally aspirated B16B engine outputs one of the highest horse power per liter, coming in close to 105 HP/L. The combination of a lightweight hatch and high revving engine make it a fun and nimble car to throw around the bends.

Parts:
  • Chassis Weight Reduction: Stage 3 + Window Weight Reduction + Carbon Bonnet + Rigidity Improvement
    .
  • Engine Tuning: Sports ECU + Stage 3
    .
  • Intake System: Sports Intake Manifold + Racing Air Filter
    .
  • Exhaust: Sport Exhaust Manifold + Catalytic Convertor: Sports + Titanium Racing Exhaust
  • Transmission: Fully Customisable Transmission
    .
  • Drivetrain: Clutch: Twin-Plate + Flywheel: Semi-Racing + Fully Custmisable LSD
    .
  • Suspension: Fully Customisable Kit
    .
  • Tyres: Sports Tyres
    .
  • GT Auto: Championship White + Front Type A + BBS wheels


Settings

Driving Options:
  • Transmission: MT
    .
  • ABS: 1
    .
  • Other Assists: OFF

LSD:
  • Initial Torque: 10
    .
  • Acceleration Sensitivity: 40
    .
  • Braking Sensitivity: 5

Suspension:
  • Ride Height: -17 / -13
    .
  • Spring Rate: 7.8 / 2.5
    .
  • Dampers (Ext.): 8 / 3
    .
  • Dampers (Comp.): 5 / 2
    .
  • Anti-Roll Bars: 3 / 6
    .
  • Camber Angle (-): 2.5 / 4.0
    .
  • Toe Angle: -0.10 / -0.45

Brake Balance:
  • 6 / 7

Performance & Stats:
  • Power: 283 BHP/8900rpm @ 329 km
    .
  • Weight: 888kg
    .
  • Performance Points: 467


Results:
Tsukuba (tuning circuit, lowest overall) - 1'01"686
Here is a BMI video of a hot lap from K.Tsuchiya in a Spoon EK9 - http://www.youtube.com/watch?v=TpqrEDjbhp8. He clocks a time of 1'05"560.

Laguna Seca (post tune circuit, lowest of 3 laps) - 1'40"161
From "Motor Trend" (http://www.motortrend.com/features/laguna_lap/112_0902_2009_nissan_gtr_laguna_lap/index.html) we see a Nissan GTR clocks a time of 1'40"450.. I'm unsure how accurate the GT5 time is in this case!


Comments:
Basically, treat this as any FF car and you will be fine. It goes without saying, but I'll repeat it anyway - with the FF layout you cannot ask the wheels to brake, steer and accelerate at the same time. Adjust speed and brake prior to the corner, turn with slight acceleration, straighten the wheels and punch the throttle. Specific to the EK9 and the BYS tune, it wouldn't hurt to feather the accelerator while exiting corners.

Perhaps with careful driving and a set of Racing Soft's, a sub 60s time on Tsukuba could be possible. A naturally aspirated, 1600 cc, front wheel drive lapping Tsukuba under a minute would be something pretty special.
 
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A few things; it looks like the diff is scaring you a bit. Experiment a bit with IT and accel... I've found that on some FWDs a bit higher accel lock will help lap times very measurably albeit at a slight cost of "push" when you don't get it quite right. That said, on my Volvo C30 I gained about .5s at Eiger from tightening the diff accel into the 50s and about 2 seconds at the 'Ring despite a worse lap. Those who wait for the car to straighten out before accelerating won't notice as large of gains but the car can pull harder out of corners with a stronger diff setting.

Suspension looks good until I come across the alignment... Personally I'd try running slight toe-in on the rear with 0.0 rear camber just because it's found results for me in a few cases and less toe is always good when you're strapped for power. Also, I find there to be diminishing returns with toe in the corners... More doesn't always make the difference you're looking for.
 
Regarding the diff, I did test different settings and of course pumping more power through the wheels should be balanced by turning up (at least) the acceleration sen., but as you know - at the cost of added understeer. I opted for these values as I believe it strikes a good balance between both.

Regarding the suspension, as you know GT5 tuning is not exactly true to life in some regards so after my tuning process and I came up with these settings. Although you are correct, I'm scratching my head on the high rear camber - although it's not detrimental to the handling characteristics so I will leave it as is. Thanks for the input, I will take it into consideration for future FF tunes.
 
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bys
Regarding the diff, I did test different settings and of course pumping more power through the wheels should be balanced by turning up (at least) the acceleration sen., but as you know - at the cost of added understeer. I opted for these values as I believe it strikes a good balance between both.
Click to expand...

Well, given that the FC LSD uses the same values for all cars (10/40/20 always), it's not the case. Depending on more variables than I care to try to list a higher accel value in front can actually decrease understeer on-throttle when already near the limit of grip.

bys
Regarding the suspension, as you know GT5 tuning is not exactly true to life in some regards so after my tuning process and I came up with these settings. Although you are correct, I'm scratching my head on the high rear camber - although it's not detrimental to the handling characteristics so I will leave it as is. Thanks for the input, I will take it into consideration for future FF tunes. 👍
Click to expand...

I reckon the rear camber angle works, it's really a difference of which part of the tire you want to wear out first; 0.0 will bring a slip angle of the outside rear tire sooner than using more I've found while keeping the inside rather well planted... Combined with slight toe-in you can get the same rotation characteristics with slightly more grip when/if it lets go... And possibly better turn-in at high speeds. The setup currently sitting on my Atenza 23Z is possibly a bit extreme of an example; at high speeds it tends to lose the tail before the front washes out despite being a FWD. :scared:
 
Just given your set up a good testing. Overall not too bad. Not great but not bad either. I'm using a DS3 controller so that may make a difference.
Anyway i had a 5 minute fiddle with the set up (Not done a proper tune on this car yet) & found this setting to be around 1.2 - 1.5 seconds quicker.

LSD:
Initial Torque: 18
.
Acceleration Sensitivity: 38
.
Braking Sensitivity: 8

Suspension:
Ride Height: -15 / -15
.
Spring Rate: 8.0 / 3.5
.
Dampers (Ext.): 6 / 5
.
Dampers (Comp.): 5 / 3
.
Anti-Roll Bars: 2 / 4
.
Camber Angle (-): 1.8 / 0.8
.
Toe Angle: -0.20 / -0.20

Brake Balance:
5 / 5

Like i said this is just a quick adjustment. I haven't done a proper tune for this Civic yet. Try it out. I may help you it may not.
 
Thanks for trying out the tune. Having also tried it with the DS3, albiet by chance (in order to get a quick replay for photomode), I found the handling characteristics to be quite different. However I chalked this up to the fact that I am no longer used to the DS3, since i've spent the last few months playing with the DFGT. Anyway, I have made a note of your tune.
 
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bys
I did not realize 10/20/40 was applied to all cars, I was under the impression the values are retained from the stock LSD! Good to know.

And hearing about your Atenza reminds me of this - http://www.youtube.com/watch?v=cUNMWGuduB0 :lol:
Click to expand...

Nonononono, that'd be my old DC5 from GT4. :dopey:

Also, if you want to see the stock diff values you do need to install the FC unit... Then go to drivetrain, reselect stock, and click on the settings button. Voila, stock revealed. Same goes for trans and suspension.
 
"La Scure" 74' Countach LP400
[skilled]


(click for more pics)​


Introduction:
The Countach not only ushered in a new era of super cars upon it's inception in 1974 but continued to spread it's influence over it's 16 year life span. The combination of a tubular space frame design, the instantly recognizable stream lined shape and a 4L V12 power house topped of by a MR layout allows the LP400 to continue to be a thorn in side of the younger, sleeker super cars of today.

Parts:
  • Chassis Weight Reduction: Stage 3 + Window Weight Reduction + Rigidity Improvement
    .
  • Engine Tuning: Sports ECU + Stage 3
    .
  • Intake System: Sports Intake Manifold + Racing Air Filter
    .
  • Exhaust: Sport Exhaust Manifold + Catalytic Convertor: Sports + Titanium Racing Exhaust
  • Transmission: Fully Customisable Transmission
    .
  • Drivetrain: Clutch: Twin-Plate + Flywheel: Semi-Racing + Fully Custmisable LSD
    .
  • Suspension: Fully Customisable Kit
    .
  • Tyres: Racing Soft Tyres
    .
  • GT Auto: ROSSO SIVIGLIA + Wing Type A


Settings

Driving Options:
  • Transmission: MT
    .
  • ABS: 1
    .
  • Other Assists: OFF

LSD:
  • Initial Torque: 10
    .
  • Acceleration Sensitivity: 15
    .
  • Braking Sensitivity: 35

Suspension:
  • Ride Height: -25 / -23
    .
  • Spring Rate: 11 / 9.5
    .
  • Dampers (Ext.): 4 / 4
    .
  • Dampers (Comp.): 4 / 4
    .
  • Anti-Roll Bars: 2 / 4
    .
  • Camber Angle (-): 2.0 / 1.5
    .
  • Toe Angle: +0.20 / +0.15

Brake Balance:
  • 6 / 5

Performance & Stats:
  • Power: 525 BHP/8900rpm @ 852 km
    .
  • Weight: 905kg
    .
  • Performance Points: 579


Results:
Tsukuba (tuning circuit, lowest overall) - 0'54"436
Here is a BMI race including the LP550-2 & LP560-4 on Tsukuba - http://www.youtube.com/watch?v=TQ9pSmft2oU. The LP550-2, which as the name suggest has 550 BHP, clocks a lap time of 1'03"164. The large laptime difference is probably due to the difference in tyres (racing slicks in GT5 vs. sports tyres in BMI).

Laguna Seca (post tune circuit, lowest of 3 laps) - 1'26"241
From "Motor Trend" (here) we see a 2010 Dodge Viper clocks a time of 1'33"920.


Comments:
This tune was crafted out of necessity, the necessity to get the most "bang for buck" in the A-spec, B-spec and Seasonal events series. This car is the work horse of my GT career and continues to punch above it's weight in several series. As such, this tune is suited to my driving style (on the DFGT) and thus requires a similar conservative touch to avoid it biting back. It is a bit squirmy under brakes, so avoid braking late or turning excessively while braking (especially from high speeds) as it locks into a slide. Once you can tame it however, you will have a beast of a car!
 
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"godzilla" 94' Skyline GT-R V.spec II



(click for more pics)​

Introduction:
Produced out of a need for group A racing homologation, the R32 GT-R was born to race on the circuit. The power house - RB26DETT - standing for "Race Breed - 2.6 L - Dual cam - Fuel injected - Twin Turbo" provides a healthy 276 HP in stock form. However, this figure can be increased greatly through tuning of the intake, engine and exhaust components - thus making it a favorite among tuners (the video link below is just one example!).

Parts:
  • Chassis Weight Reduction: Stage 3 + Window Weight Reduction + Carbon Bonnet + Rigidity Improvement
    .
  • Engine Tuning: Sports ECU + Stage 3
    .
  • Intake System: Sports Intake Manifold + Racing Air Filter
    .
  • Exhaust: Sport Exhaust Manifold + Catalytic Convertor: Sports + Titanium Racing Exhaust
    .
  • Turbo Kits: High RPM Range Turbo kit
    .
  • Transmission: Fully Customisable Transmission
    .
  • Drivetrain: Clutch: Twin-Plate + Flywheel: Semi-Racing + Fully Custmisable LSD + Torque Splitter
    .
  • Suspension: Fully Customisable Kit
    .
  • Tyres: Sport Soft Tyres
    .
  • GT Auto: Saddle Tan Metallic + BBS wheels + Front Type A + Extension Type A


Settings

Driving Options:
  • Transmission: MT
    .
  • ABS: 1
    .
  • Other Assists: OFF

LSD:
  • Initial Torque: 5 / 12
    .
  • Acceleration Sensitivity: 10 / 35
    .
  • Braking Sensitivity: 20 / 20

Torque Splitter:
  • F/R Distribution Torque: 30 / 70

Suspension:
  • Ride Height: -12 / -10
    .
  • Spring Rate: 5.8 / 4.2
    .
  • Dampers (Ext.): 3 / 2
    .
  • Dampers (Comp.): 3 / 2
    .
  • Anti-Roll Bars: 1/ 3
  • Camber Angle (-): 1.0 / 0
    .
  • Toe Angle: -0.10 / 0

Brake Balance:
  • 7 / 7

Performance & Stats:
  • Power: 667 BHP/8400rpm @ 302 km
    .
  • Weight: 1245kg
    .
  • Performance Points: 582


Results:
Tsukuba (tuning circuit, lowest overall) - 0'58"059
Here is a time attack of a heavily modified R32 on what I'm assuming to be racing slicks - http://www.youtube.com/watch?v=g46BskVLSUo. The second R32 clocks an amazingly quick time of 0'55"910!

Laguna Seca (post tune circuit, lowest of 3 laps) - 1'30"469
(as above) From "Motor Trend" (here) we see a 2010 Dodge Viper clocks a time of 1'33"920.


Comments:
This tune takes advantage of the raw power of the GTR and as such some cornering ability is sacrificed for straight line speed. Also skewing the torque bias to the rear allows for controllable throttle-on oversteer. If you find the rear end slipping out from you, either slap on some racing semi's or turn up the TCS.
 
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/edit - i used sport softs too. btw, the times I post are for a general indication - not a "time attack".
 
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