Online Horsepower Calculators

70aarcuda said

fly wheel hp....ok

How does..the calculator know if I am running a 904 or 727?....a 727 takes more HP to turn then a 904.....

I can run almost 2 tenth faster with the 904 which shows more hp....but the engine is making the same hp with either trans...

I would assume the calculator uses a flat % of drivetrain loss regardless,,,,

dynos and calculator should be taken with a grain of salt..

Click to expand...

AGREED!.....perhaps a bit larger than a grain of salt, but yes, they are only a tool not an absolute, and yes, a dyno is just a tuning tool nothing more, its on track numbers that count as your sig says. I ONLY use the calc I gave the link for as it has been reasonably accurate on timeslips actually run by me and fellow racers cars I know the specs of currently. Other wallace calcs that give rwhp are off a long way as they only give 10% drivetrain loss as you mention. Also when trying to calc out the numbers for a Stocker, its miles out, had this discussion on Moparts.

I could give you the specs of my '69 car and what wallace said it should run against the timeslip/fly hp and it was close if your interested?