I know that because there is less oxygen density in the air at higher altitudes, the same engine will produce less hp and tq at, say, 5000 ft. above sea level than it will at sea level. Does a dyno factor altitude into its measurements so that altitude is compensated for? I think that the SAE standardization takes into account air temperature, humidity, and barometric pressure, so I don't think SAE standardization will account for the altitude, or does it?

Thanks.

 

The ECM and the associated sensors do compensate for altitude. One reason I went with a EFI bike.

 

Actual barometric pressure IS altitude. Haven't looked up how they define "standardization", but unless they're using a baro setting corrected to sea level, the elevation should be accounted for.

 

Right on.. The barometric is not the corrected to sea level pressure but absolute.