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[oldeskewltoy]

NoHachi Wrote:Wheel-hp will vary as much as 20% between dyno's and is as useless as engine hp. Sometimes more (see e.g. Mahle dyno's or dynojet dynopac)

just a random brain journey......

My car has now been on 3 different dynos... the readings have been 140 whp, 145 whp, and 142 whp... respectively

There have been no mechanical changes to the engine, the only changes have been in the engines tune.... and most WOT runs are easy enough to replicate.

My engine: Web cams 577 (264 type) TRD springs, light weight wrist pins - all other internal parts are stock... with carefully targetted machine work and porting.

I know I've been rambling... but my point here is I'm not so sure dynos are 20% different.... I believe it to be other variables like operator error - this is big because it means all the prep too - like tire pressures, and correct fitment to the dyno. Case in point... My All-Trac Corolla planted 40% more power with 28psi, as opposed to 23 psi in the front tires alone