I can tell a huge difference in the amount of power I have on tap depending on the temp of the intercooler. I can see how a nice IC sprayer/nitrous sprayer would be a great help at the 1/4 mile.
I know that the new(2004?) F150 Lightenings are using an a/c based system to cool the IC down, and on that engine its good for a 50 hp boost, "transient" as the ford engineers put it.
Heat and humidity really do screw with FI engines alot. Tho, I don't quite grasp why humidity would play such a factor. Seems like air with a higher percentage of moisture would HELP remove heat from a IC or radiator ya know? Is the moisture displacing combustible components in the combustion chamber or something?