Consider rpm drops more than peak. I know, we all refer to peak rpm with engines in oval karting, but your drop rpm and power curves are what determines the peak rpm you are aiming for. Your engine builder is simply offering you a peak target to aim for.
Big momentum tracks have lower rpm drops, therefor you will need to over-rev the peak of your HP curve less.
Tighter tracks with higher rpm drops require turning the engine more rpm to keep the engine in the meat of it's powerband at corner exit.
Keep in mind that dynos cannot simulate track conditions or rpm scrub.
Short answer = a stop watch never lies.
If it's faster on your mychron, then it's faster on the track.
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Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cut
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www.CarlsonMotorsports.com
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33 years of service to the karting industry ~ 1Cor 9:24
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bcarlson@CarlsonMotorsports.com