 Recently I've had some time to poke around the car files in GTR2 and was a little disturbed to find that the Corvette C5R that's modeled in the game is not fitted with a proper transmission or engine. For starters the so-called LS1 engine is in fact mislabeled. The performance stats that are available in the file are more indicative of a Chevy LS6 engine in racing configuration. This wasn't a huge problem though as the tech data seemed to match up fairly well.
However when I began looking in the transmission (gear file) I found something rather alarming. The default for this car isn't even close to the actual Corvette (racing, street or otherwise). The file specifies that it's a Hewland DGB LS-200 Gearbox fitted to a Ferrari 550, which is rather ludicrous for a Vette. Sure the car drives fine in game, but the gear settings are nowhere near realistic. For starters the final drive was set to 2.92 in the Hewland, but a quick Google reveals that a Vette final drive is 3.42 regardless of whether you look at a C5.R, a C5 Z06 or even a new C6 model.
So I popped open a text editor and created a new gear file which would contain not just the new final drive setting but all of the missing gear ratios for a proper Vette transmission. The final drive change has a dramatic effect on the overall gearing of the car so to start with I added all of the known gear combinations for a Z06 Vette. I started with a list posted on several websites, which created a good base. The only ratio I discarded was the .57 6th gear which simply creates a massive overdrive and isn't that useful in a close ratio racing transmission.
The next step was to locate the OEM Vette transmission, which is a Tremec T56 for the Z06. Using a gear ratio chart via the website I was able to add a few extra gear ratios to my list so that could better tweak my race setup. Then using some basic calculations via Gear calc I was able to establish a default setup for the new transmission, though I had to allow for the in game tire size which differs slightly from a real world ALMS configured C5/C6.
The result was a Corvette more reminiscent of the version in GTR1 which could have an excessive amount of rear wheel spin if you weren't light on the throttle as well as a better response to the lower revving, high torque LS6 motor. Below is a list of ratios I added to the HewlandLS201 file (for simplicity sake). I then hopped in the car and tweaked out the gear setup, save the setup and then copied the gear settings from the setup file to a duplicate of the C5R.hdc file.
//TREMEC T-56 Gearbox (gear sets forward of Differential)
//Fitted to: Corvette C5R
[GEAR_RATIOS]
Ratio=(12,41) // 3.42
Ratio=(11,37) // 3.36
Ratio=(12,36) // 2.97
Ratio=(12,32) // 2.66
Ratio=(15,31) // 2.07
Ratio=(18,32) // 1.78
Ratio=(21,30) // 1.43
Ratio=(17,23) // 1.35
Ratio=(20,26) // 1.30
Ratio=(24,24) // 1.00
Ratio=(25,21) // 0.84
Ratio=(25,20) // 0.80
Ratio=(23,17) // 0.74
Ratio=(24,17) // 0.71
[FINAL_DRIVE]
bevel=(1, 1) // 1.0
ratio=(12, 41) // 3.42
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