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Different gearing changes the torque-rpm curve but NOT the power. By changing your gear ratio you can increase your torque but will decrease the amount of time you can maintain that torque (i.e., you'll hit engine's redline sooner). So you can get your car out of the blocks sooner than the other guy -assuming no problems with traction- but he will catch up to you when you run out of RPMs and have to upshift sooner than he does.
There is no free meal in gearing (unless you racing somebody over a very short distance.)
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