Or, take it to the chassis dyno, and measure its curve of power vs RPM; then take it to the track, and make a few passes; and use both pieces of info to make the choice. Which like everybody says, in most cars you'd want to shift right about the RPM of peak HP, and trap 2-300 RPMs higher. Pick a gear to get the motor RPM correct (a couple hundred RPM past peak HP) for the trap speeds you get at the track, and shift at peak RPM. See how that works and adjust from there. Hopefully it'll be close enough that you won't have to do it twice.
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