People should not look at dyno PEAK numbers period. Doesn't matter whether it's flywheel or wheel horsepower, 1 is not necessarily more accurate than the other. In order to compare anything it must be the same dyno anyhoo and then what does it matter. You can make 500whp peak at 4500 and a car that makes 450 peak at 5500 with a cleaner curve might be faster depending on what the rest of the rpm points are like.Originally Posted by ttboost
I don't quite understand why the tuning scene insists on using a different ruler (whp) from what manufacturers quote (bhp) I'm guessing because dynoes that only do whp are vastly cheaper and got to be the standard by the sheer number of them around. The problem with wheel power is that it is influenced by a lot of variables, flywheel power is more of a constant. There are (expensive) dyno's that will be within a few horsepower accurate with flywheel numbers and give you the tire loss while you're at it if you want to see how much made it to the rollers. But anyway like I said peak values are fairly meaningless anyway. What would be useful is getting an average power value within a useful RPM range. That would give a very good idea of performance.
By the way, dynojet "wheel" power numbers are not really exactly what got measured at the wheels. There is a calculation in the DJ software that will add a percentage. It goes back to when it was created, when the numbers rolling out of it were a bit dissapointing to car owners who did not understand the engine power vs wheel power concept very well.
Can't speak for anyone else but mine certainly didn't - euro car. Not stock and not after it was mapped.
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