Correction for humidity?

[BoostMasterK]

I know the rule of thumb for turbo buick ET/HP temp correction is about 10HP=one tenth=10 degrees temp, but is there a rule of thumb for humidity?

Mike

 

[BoostMasterK]

ttt

There's gotta be some bracket racers or someone with a consistent car that has an idea how bad it affects...

TIA

Mike

 

[Terry_H]

I'm not an expert, but my understanding is humidity plays a role, but how much a role is based on temperature also. For instance, if it's 90 degrees and there's 70% humidity, that humidity will have a greater impact than if it's 70 degrees and 70% humidity.

Humidity displaces oxygen molecules with water vapor, so humidity alone hinders horsepower, but not to the effect that temperature alone does.

I believe the correction is a WAG (Wild Ass Guess)!

 

[Jerryl]

.............. Humidity displaces oxygen molecules with water vapor, so humidity alone hinders horsepower, but not to the effect that temperature alone does.........

I am not an expert either but play around with this. As Terry_H stated, higher humidity decreases relative HP (Makes sense). This link gives an idea "how much" and also a good idea on the effect of temperature.