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Originally Posted by Ramega
Why would moist air make more power? You can't burn the water in the air. I would think cold, dry air (more densely packed oxygen molecules) would be ideal.
I can definitely tell the difference in my current car ('96 Mustang Cobra) and I remember being able to tell in my old '85 200SX.
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Well you seem to be correct. I'm sure there are plenty of these calculators around but I found this interesting little page and if I put in higher relative humidity, the relative power goes down slightly
http://wahiduddin.net/calc/calc_hp_abs.htm
Maybe ....I'm thinking that in my case being turbocharged and running boost near the limit or even above the efficiency range of my turbos, the moisture in the air is like water injection and the cooling effect of the latent heat of evaporation of water allows me to boost higher at the same outside air temperature or make more power at the same boost without the ECU pulling timing to retard knocking etc. But I'm not 100% sure that's right, I'm just sort of fantasizing that.