letS4nicate

I was always under the impression that high heat and humidity adversely affected performance in turbos. I have found this to be true in my experience and thought that the less dense, moisture filled air did not lend itself to turbo engines. I know my performance drastically increases in the fall on cold and dry days.
Someone is telling me that it is the opposite- that heat and humidity are better for turbos.
What gives?

FAS4T

BAD! Colder air is more dense which will enable your engine to perform better

Ron_C

Cold air is better for perfomance because it is more dense.

bageldog

IIRC, for every ~11 &deg cooler the intake charge = a ~1% HP increase (ie. Heat = Bad)

Ron_C

I shouldn't have changed my wording!

Hoenle

Isn't humid better than dry though? (perhaps in hot weather only?)

letS4nicate

That's what I thought but what about the humidity part?

System_S4k

Then our ECU cuts back the boost.

letS4nicate

I thought dry air was better than moist. What is the benefit of moisture?

Hoenle

I remember reading an article by some guy in AZ that said it kept temps down?? Better for turbos??