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Originally Posted by MelScrilla  I'm no turbo expert so dont flame me if i'm wrong but it seems like fi cars especially turbo cars use lower gears in the rear than a n/a car. If you look at the na cars most a4 guys run 3.73 and m6 guys run 4.10 atleast. but turbo cars seem like they usaully run a 3.23 or something like that. this could affect the short time on the cars and they make time up on the top end with high trap speeds. | Turbochargers like load. So numerically lower(3.07/3.23/3.42) gears are prefered to stay in boost longer and harder. If your car is a pure 1/4 mile car you will still need to gear it for what rpm you want to running through the traps at. I've got 3.46's in my GTO, but I might need to drop to 3.07's to prevent going to high in the rpm band with my TH400. I will try taller tires first, but I can only fit 28" tall.
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2005 Pontiac GTO, FTI TH400 w/transbrake, FTI 3200/4200rpm stall, ported 243's, Comp 921 springs, C6 manifolds, turbo, forged ironblock 9.3:1 370.
4200lb heifer w/ 3.46 gears and 26" tires
12.21@114.13 1.82 60ft on Street Tires, 2638ft DA
Best 60' 1.78 on Sumitomo HTR Z 255/45r17's at 24 psi |