Drivers and crew chiefs unite!!!!!

[GT_Beat]

This thread is meant to be a sharing of skills.... some of us are great drivers, but don't necessarily have the best tuning abilities ( or at least the patience for endless testing).... then there are some of us who thrive on endless comparison tests and tuning setups, but don't have the best of driving skills.

What I propose is this: we the drivers will post a setup issue... include all pertinent info , like track, full list of equipped mods, current race times/laptimes, and a breif description of what handling problems one is having.... I think it best that drivers first attempt be driven with default setup, except for maybe simple things like auto gear setup.

After driver posts, then one of our great testing engineers (crew chief) would then suggest one or two setup changes at a time, with the driver then using that info to re-test the race run, and report back to the crew chief any additional data, and so on until the driver is satisfied that no better setup is possible.

In return, the drivers would be able to provide tips for improving driving skills, or ideally replay files that could be reviewed by crew chiefs to improve their driving abilities.

We could possibly team up a certain driver with a certain crew chief to create competitons... any additional input on this will be gladly accepted.

 

[Parnelli Bone]

Well as Sucahyo and Mac know, I do most of my racing against the low-talent sim disc cars, and for the most part I find myself not needing any help...in fact, 90% of the time I tend to downplay my car's tires, power, and drivetrain parts in order to get a truly challenging race. But if I ever need any help, I'll give a holler on this thread.

 

[sucahyo]

Maybe you can start by choosing the car and the track.

 

[GT_Beat]

Let's start with an easy one... although it took quite a few tries, I DID finally beat this race. This weeks driver/crew chief challenge is to beat GT All-Stars Super Speedway in an '83 RX-7 turbo. Without racing mod. Trust me , this one was not easy. one small hint... you neea a setup for slight drifting.

Ok, suchyo, lets see what you've got...I'lll post my car mods/settings next.

 

[GT_Beat]

ok, here are my times for the race

Total= 3:08.179

lap 1= 44.012
lap 2= 36.400
lap 3= 35.432
lap 4= 36.679
lap 5= 35.656

Other car's times as follows:

1. Mazda RX-7 GT-Turbo '83 3:08.179
2.Lotus Elise GT1 +1.190
3.[R] Jaguar XJ220 GT Race Car +2.022
4.[R] Opel Calibra Touring Car +2.187
5.[R] Alfa 155 Touring Car +2.208
6,[R] Lister Storm V-12 +3.059

My car had max mods with exception of LSD, TCS, YCS, and ASC. This is also witout Race Mod... car DOES have stage 3 Weight Rediction though.

Suspension:
Spring rate= 9.3/9.3
Ride Height= 109/109
Bound= 7/7
Rebound=4/4
Camber= 2.0/1.0 (same as default)
Toe= 0.00/0.00
Stabilizer=5/4
Trans.

Auto-gear @12, changed final drive ratio to 3.735

My times here on super-soft tires... tried soft, could not get same times. I am thinking maybe should try a LSD but don't know which one. The car is tricky to keep from oversteer in high-speed cornering. My best cornering speed is about 130-135 for small end, 150-155 for wide.

 

[Parnelli Bone]

Oh I get it now..you're saying name a track & car and then ....never mind.

Anyways, I was surprised I won here...I almost lost to the GT40 as I braked too late a couple times, but I managed to beat it right in the last few seconds. The Ai in this race (really, in any race at Super Speedway) uses too much brakes in to turn one and two...really, they're only necessary in turn 2...that's why it's possible to win here in such an underpowered machine.

Springs: 10.8 / 8.8
Ride: ```112 / 105mm
B. Damps: 5/5
R. Damps: 4/3
Camber: 1.9°/1.2°
Toe: 0.0/0.0
Stabl: 4/3

Braxe: 17/10

Tranny on Auto 13 with twin clutch, semi-racing fly & carbon shaft
1st: Minimum
2nd: 1.600
3rd: 1.150
4th: 0.880
5th: 0.700
Final: 3.775

LSD: 45/40/45
Tires: super soft
NO traction controls.

Yeah, limited slip helps a bit, but lack of downforce is really why the RX-7 wants to get sideways.

 

[GT_Beat]

Thanx Parnelli..... could you post times too, next time??? That way any of us who want can try your setup and be able to compare laps as a baseline. I'll let you know how the race turns out with some setup tweaks... maybe I can try to beat it running against the Toyota GT-One

 

[sucahyo]

The first thing I notice with GT_Beat setup is hard suspension, try using 1/1 1/1 damper, and 1/1 stabilizer as starting point. At least it will reduce snappy oversteer.
For reducing oversteer more, try using 2.0/20.0 spring rate as start, very low for front and very hard for rear. On my test I find using hard spring rate increase traction, but thats just based on my conclusion. Using hard rear will not make the car jump as much as hard front.

 

[Parnelli Bone]

Thanx Parnelli..... could you post times too, next time??? That way any of us who want can try your setup and be able to compare laps as a baseline. I'll let you know how the race turns out with some setup tweaks... maybe I can try to beat it running against the Toyota GT-One

My best lap time was in the final lap...34.xxx sorry I can't remember exactly. I'm sure I coulda knocked an extra second off my game had I done a second race. And I was up against a GT-One Toyota...it came in 3rd place, believe it or not.

My main b!tch here was the bumpiness described also by GT-Beat. The car starts to bump, tries to get sideways--so I'd have to countersteer which dangerously can ruin the race...it takes quick blips of the steering to get back into the proper path. As you can see, I found that using a lower ride height in the rear helped a bit but couldn't cure the problem. Also, the limited slip device would work initially, but when the going got rough it just seemed to give out.

 

[sucahyo]

My main b!tch here was the bumpiness described also by GT-Beat. The car starts to bump, tries to get sideways--so i'd have to countersteer which dangerously can ruin the race...it takes quick blips of the steering to get back into the proper path. As you can see, i found that using a lower ride height in the rear helped a bit but couldn't cure the problem. Also, the limited slip device would work initially, but when the going got rough it just seemed to give out.

I usually avoid using lower rear to reduce oversteer as it can reduce acceleration. Why you use high spring rate for this race, isn't you usually use low spring rate? And I think high spring rate make the car more sensitive.

 

[Parnelli Bone]

I usually avoid using lower rear to reduce oversteer as it can reduce acceleration. Why you use high spring rate for this race, isn't you usually use low spring rate? And I think high spring rate make the car more sensitive.

Good questions. Acceleration isn't so important in this race to me...no matter what, the RX-7 is gonna fall far behind on that first lap anyways. And you're right--you wouldn't think I would use a higher spring rate at Super Speedway, but I do it because most of the track is mirror-smooth. There are only a few rough patches, and I just deal with them rather than make my car handle softly into those turns & out of them.

 

[GT_Beat]

Ok, new setups help me shave total time to 3:05.639 with laps from 35.901 to 35.057... also shaved 1st lap to 43.314. Here is my setup:

SUSP
SPRING 2.7/19.9
RIDE HT 101/139
BOUND 3/3
REBOUND 2/2
CAMBER 2.0/1.3
TOE 0.00/0.00
STABIL. 1/2
TRANNY
AUTO SLIDER AT 12, FINAL GEAR AT 3.735

I also tried it on tuned turbo test track.... still handles good enough to keep 195+ on turns, with trans opened up a bit ( 21?) also got a drafting top speed of 231.58

Tried same setup on Deep Forest===DISASTROUS!!! The rear end actually bounced so high in one spot that IRL the veh should have flipped end for end.... still driveable, but like on razor edge. WAAAAAAYYYYY to tight on rear susp; spun out 4 times on 1st lap.

 

[sucahyo]

Ok, new setups help me shave total time to 3:05.639 with laps from 35.901 to 35.057... also shaved 1st lap to 43.314.
Tried same setup on Deep Forest===DISASTROUS!!! The rear end actually bounced so high in one spot that IRL the veh should have flipped end for end.... still driveable, but like on razor edge. WAAAAAAYYYYY to tight on rear susp; spun out 4 times on 1st lap.

To get faster lap time try using auto 13 at 2.500 final drive.
To drive it in bumpy corner you should at least reduce the bound damper and rear spring rate. Reducing bound damper will reduce the jump effect of bump. If reducing bound damper is not enough, reduce the spring rate. To prevent spin, release the throttle when counter steering.