Dyno #s and Ambient Temps

[DrumrBoy]

Clearly you make more power with a cold air charge, but does anyone know what percent HP/TQ difference should be expected on a dyno at 70 degrees F versus 95 degrees F? Oh yeah, assuming no tuning to adjust for temp diff.

Thoughts/guesses welcome though identify WAGs so we can take 'em with a grain of salt.

 

[kwkshift]

All things being equal, every 10-12 degrees is about 1% change in power.

 

[DrumrBoy]

Thx. Anyone know which is worse, tune for 75 and run at 95 or tune at 95 and run at 75?

 

[pdmracing]

your dyno , depending on type, may already be correcting for ambient temp, b pressure ect.

 

[Jack B]

The dif from 70 to 95 degrees represent a 2.8% decrease in hp, but, as offered the dyno correction factor takes care of the difference on paper.