Best dyno numbers are achieved in cold dry conditions.
Temp and humidity impact dyno numbers. My car is dyno'd a lot as we are always working on it.
I have personally seen numbers change as much as 10hp on a same day morning/afternoon Dyno without changes to the tune.
A few tuners and most engine builders dyno cars in a controlled environment to minimize environmental impact on the results.
Thanks I was just asking. I know there are correction factors involved but was just wondering about how accurate those factors are. I know nothing is perfect have heard the same thing. Cool dry air it the best. So if I have cool wet air how much could the numbers change even after the correction factor if at all.
Thanks for your help. I just dynoed the new 417 with a small cam yesterday. Numbers and chart to come only after I get all the details wrote up and ready!:cheers: