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Dyno correction factors

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Does anyone have info on the SAE correction factors used on the dyno? How does it work ? Supposedly gearbox/drivetrain losses, temperature and altitude.

My scenario same car on different dynos , but getting a big difference in power . My understanding it should be very similar in power with the same correction factor.

Some dynos are more accurate than others. It's more important to be repeatable, and do your testing at the same dyno.

You might find this article about SAE correction for standard condtions useful:

https://www.motortrend.com/how-to/ghtp-1109-fact-and-fiction-of-dyno-correction-real-wheel-horsepower/