On a street car, you have to optimize for a number of different things. Sometimes power, sometimes torque, sometimes fuel economy, sometimes noise, and so on. Depending on how you control the CVT, you can run the engine somewhere near its peak of one of those things.
For a race car, you basically just want peak power. Which basically means running the engine at its peak power RPM, at least for a given throttle setting. A much simpler optimization problem, but at power levels that are almost certain to be pretty punishing for the hardware.
-soD
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