Quote:
Originally Posted by jkennedy293
RWHP, because that is the power that is reaching the ground. You can have a huge flywheel number, but if your suspension is crap, most of the power will literally go up in smoke.
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WHP since it could be RWD, FWD or AWD. Suspension will not take away hp but it can help or hurt making the tires stick which isn't really an issue on a dyno unless you have 1000+hp. The drivetrain loss comes from driveline weight and other mechanical inefficiencies in the drivetrain itself.