how much does humidity hurt out engine's performance

[Only4U]

can really high humidity cause as much as a .5 sec difference in quarter mile compared to really low humidity? i've heard our cars just don't deal with humidity very well, true?

[MustangEater8251]

all cars don't deal with humidity well.

you are sucking "water" into the intake and to the cylinders so the air is damper, allowing for less of an explosion in the motor.

.5, i guess its possible, but seems kind high to me, my experience has been myab .2, sometimes .3 and my track is about 5 miles form a swamp, so i doubt it gets much more humid then that.

[99Camaro99]

well last night I went from 15.3s on average to 15.8 and it was humid as f*ck at Moroso. Rain just cleared...

[TTA 1387]

Very possible. I used to loose .5 and 4mph with my 96 WS6. At the track this last Friday, the TA lost .7 and 7mph. That's a little different being that its a turbo.

[W68Firebird97]

I saw a .6 and 5mph differnce when i went about a month ago. So now i dont even bother racing in the summer time i just wait for fall and early spring.