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Originally Posted by ProdigyCustoms
James, since I do not come from a top speed enviroment, I always wondered if a overdrive and rear gear set up that equals a the final drive of a 1:1 drive ratio would pull the same. For example the final drive with a .064 overdrive on a 3.90 ratio would be equal to a 2.50 ratio 1:1 trans high gear. Would the overdrive 3.90 run the same as the 2.50 ratio 1:1? Would it take more horsepower to pull the overdrive 3.90?
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At the same engine rpm,the OD trans would be spinning the ring & pinion(also driveshaft) alot faster = more friction & drag.
It takes approximately 450rwhp and the right gearing to push a C4 Corvette to 200mph. The aero characteristics become a little scary above 175,though.
My 90 ZR-1 with 420rwhp and a 3.45 rear cog would run 192mph in 5th gear (ZF6 trans). Doug Rippie was driving and I was in the passenger seat (with Simpson harnesses as tight as possible
).