You can alter all the settings, but you can't run anything but Racing Medium tires, and there are no engine upgrades.
The good news is that it never ages or slows down in any way. Think of it as indestructible and immortal.
Try this slightly-modified-from-stock setup. (Thanks to "R32GTST/M", "stigie", "Awajie Islander", and "Duck7892" for their input, which led me to it.) It works extremely well, and greatly improves tire life to boot:
SR 17.4 / 17.5
RH 45 / 45
SB 6 / 6
SR 8 / 8
Camb 2.0 / 1.0
Toe 0 / -2
BB 4 / 1
LSDI 15
LSDA 45
LSDD 55
ASM 10 / 10
TCS 5
DF Max
To use the transmission final drive settings below, first do the old "tranny trick":
1. Slide Final all the way to the right to 5.500.
2. Slide Autoset full right to 25, then full left to 1 and leave it there. You now have a very close set of evenly-spaced gears without having to tediously set each one.
3. Then slide Final to the ratio for the track you are going to race on. Here are the actual Final settings for each track in the Formula GT series:
Tokyo Route 246 - 3.220
Twin Ring Motegi-Super Speedway - 3.220
New York - 3.220
High Speed Ring - 3.220
Grand Valley Speedway - 3.220
Circuit de la Sarthe I - 3.220
Cote d' Azur - 3.750
Seoul Central - 3.220
Infineon Raceway-Sports Car Course - 3.700
Laguna Seca Raceway - 3.700
Twin Ring Motegi-Road Course - 3.500
Nurburgring - 3.220
El Captain - 3.400
Fuji Speedway 2005 - 3.220
Suzuka Circuit - 3.500
(Lots of tracks with the same Final, but why bother to make slight little changes when the 3.22 is almost perfect? Its certainly close enough on all of the nine tracks.)
Its just a subtle change from stock, as you can see, but the difference it makes is, to me at least, drastic. I find it to be a real improvement over stock. The tire wear problem is greatly reduced. This is not a "qualifying" setup or a tire-wear-off-lap-record setup. This is for use in the long races of the Formula GT series.
Many will scream at the 10/10 ASM setting. Let 'em shriek. ASM works differently on the F1 car than it does on everything else in the game.
(Here's a tip: On most tracks the fuel will last over twice as long as the tires. Opting to not take on a full load of fuel on every stop not only saves time in the pits, you'll go faster with the lighter fuel load. Just press "X" to stop the fueling at about 40 liters.)
