Should shift at peak HP or slightly past it depending on your power curve.
You basically want the engine to spend as much time as possible in the best part of it's power curve.
If you make say a peak of 500 RWHP, you'd want to spend time where you make the most power... peak. Shift to early and too low, you could be shifting where the car is only making 450 rwhp, and on your shift, the RPMs will drop even lower.
Hope that helps.
Some folks in pro classes will shift past peak HP because the drop-off is not that bad and they are trying to keep the RPMs up.
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Last edited by Pro Stock John; 07-17-2014 at 02:14 PM.