Tranny and rear diff gear ratio for TT Vette??
Thread Starter
Joined: Nov 2001
Posts: 8,259
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From: Valrico, Florida
Tranny and rear diff gear ratio for TT Vette?? If you had a 6 speed setup like the one I have in my signature what tranny/gear ratio would you run to optimize zero to 200mph sprints?
FRC Tom(his name on Z06vette) uses a 2.73 rear gear with a 402 & STS with upgraded turbos and alot of boost. You'd only shift 2 or 3 times before 200 lol. He's also used 3.15s which he said made a difference. A local here in Houston is putting 3.15s on his 408 STS TT
FRCs come with an M6 tranny which is a .74 5th gear. With a 3.42 final drive you would be going 206 mph at 6750 RPM (assuming a 26" tall tire).
If you had an M12 (which has a .84 5th gear), you would want a 3.15 final drive which would put 204 mph at 7k RPM in 5th (assuming a 26" tall tire).
If you had an M12 (which has a .84 5th gear), you would want a 3.15 final drive which would put 204 mph at 7k RPM in 5th (assuming a 26" tall tire).
Thread Starter
Joined: Nov 2001
Posts: 8,259
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From: Valrico, Florida
Originally Posted by pianoprodigy
FRCs come with an M6 tranny which is a .74 5th gear. With a 3.42 final drive you would be going 206 mph at 6750 RPM (assuming a 26" tall tire).
If you had an M12 (which has a .84 5th gear), you would want a 3.15 final drive which would put 204 mph at 7k RPM in 5th (assuming a 26" tall tire).
If you had an M12 (which has a .84 5th gear), you would want a 3.15 final drive which would put 204 mph at 7k RPM in 5th (assuming a 26" tall tire).
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From: Norn Iron
How much power/torque do you have, and where is it created. Do you anticipate 200 in 5th or 6th gear ?
Punch a few ratios into this, and see where 200mph will fall to tie in with your max power/torque.
http://www.geocities.com/z_design_st...ion_z28_6.html
Punch a few ratios into this, and see where 200mph will fall to tie in with your max power/torque.
http://www.geocities.com/z_design_st...ion_z28_6.html
Originally Posted by VINCE
So are you suggesting I leave my current setup alone since I have the M6 transmission with my current setup?
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9 Second Club
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From: Norn Iron
then check your current speeds, versus rpm's and play with them in the calculator to see what may work best.
If you could be pulling 200+ just around max power/torque, or perhaps a little over 200mph, then you should be fine.
If you could be pulling 200+ just around max power/torque, or perhaps a little over 200mph, then you should be fine.
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Verdad Gallardo Thread Starter
Joined: Nov 2001
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From: Valrico, Florida
Originally Posted by stevieturbo
then check your current speeds, versus rpm's and play with them in the calculator to see what may work best.
If you could be pulling 200+ just around max power/torque, or perhaps a little over 200mph, then you should be fine.
If you could be pulling 200+ just around max power/torque, or perhaps a little over 200mph, then you should be fine.
