I did tag you.
@ERAZER
Is the a Formula to setting up the gear box or just trail and error.
Oh, I see you did, strange I did'nt get the notification... Oh well.
A generic flp will always be a very good start, and for most cars, nothing else is needed.
1: reset to default
2: set final gear to maximum
3: set max speed to minimum
4: set 1'st and 2'nd to minimum (as tall gearing as possible)
5: set 5'th and 6'th to maximum (as short gearing as possible)
6: set 4'th in a way so that the spacing from 3'rd to 4'th is slightly longer than it is from 2'nd to 3'rd, but shorter than it is from 4'th to 5'th. You dont have to touch 3'rd. the spacing between the gears should be even from 2'nd to 6'th, increasing ever so slightly between each gear.
7: set final gear so that your top speed is slightly above what you reach on the longest straight (trial and error) if you got about 1000 rpm to go to rev limiter when you hit the brakes at the main straight, its good.
Furthermore:
for almost all cars I just drop springrate and dampers all the way to minimum value, some negative rake because GT6 settings is messed up (RH about 115/90 is good for most cars)
Then reset camber and toe to 0.0 (FWD cars I usually use -0.60 rear toe out)
Leave the brakes alone, and put LSD to 5/12/5 for RWD, and 5/40/5 for FWD
Also, make sure powerparts are used properly, too much and you get a flat powercurve and you loose BHP, too little and you get a engine that is too peaky and you never get to use the full power.
when it comes to weight, then
less is more, always. Unless youre in the LLC rocket or the GSX-R/4 or similar lightweighters.
And make sure you get the powerparts/weightreduction done first, or you'll mess the gearbox up.
I did a guide for this, quite a long time ago, and its mainly for race cars, and only focuses on suspension and LSD, but might still be usefull:
GENERAL GUIDE
if its too loose for you, increase rear down force a bit
If its still too loose under acceleration, decrease LSD acceleration sensitivity
If its still too loose under braking, increase LSD deceleration
If its still too loose, increase initial LSD (I do not recommend this, as it kills rotation)
RIDE HEIGHT
Max ride height: more grip and traction, but slow top speed and acceleration.
Min ride height: less grip, but better top speed and acceleration.
This means that max front and min rear gives more rotation.
SPRING
Max spring rate: less grip, but reacts to steering input faster, thus giving you more turn in and control.
Min spring rate: more grip, but reacts to steering input slower, thus giving you less turn in and control.
This means that min front and max rear gives more rotation.
DAMPERS
dampers react the same way as spring rate, but its much better to keep dampers at 1 and adjust spring rate instead. as long as you don't go to extreme values, don't bother with the game's instructions that dampers should be adjusted accordingly to spring rate. (it is very true in real life, but in GT6 its not needed).
ROLL BARS
Max Anti Roll Bar gives more grip.
Min Anti Roll Bar gives less grip.
Anti Roll Bar is interesting though, because if lowering a Anti Roll Bar, the grip increases on that axle, but if you lower both axles, the total grip is lower, not higher...
CAMBER
Camber delays the grip, just as in real life, but in contrast to real life, it does not get better when under load.
So 0/0 is pretty much always preferred, only exception is heavily under steering cars, then you can use rear camber to make the rear step out to get it to slide a little, but its a last resort, if everything else fails.
TOE
Toe is great for adjusting car behavior.
negative front toe increases rotation, but can make the car behave weird on turn in
positive front toe reduces rotation, but makes it smoother on entry.
negative rear toe increases rotation (heavily), a huge benefit on entry and mid turn, but it can kill traction out of corners.
Positive rear toe kills rotation, but helps with stability
SPECIFIC CARS
All FWD cars will benefit from this as they don't need rear traction.
4WD will also benefit from this because of their great traction capabilities.
The Chaparral 2J is another car that needs huge amount of negative rear toe,
due to its fan system giving it traction.
GUIDE TO CAR TOE
Short rear toe guide:
FWD: -1.00
4WD -1.00 - -0.60
Stable RWD cars: -0.60 - 0.00
unstable RWD cars 0.00 - +0.30