Allout

I hope this isn't a stupid question but with temperature neutral, is high humidity negative or positive on HP? I know what affect temperature has but not sure if I understand humidity. Does humidity create a more dense mixture?

Chopsie

at the track, Humidity is not a cars friend, nor is high temps, adn the combination just really sucks

darrinb

^^^

exactly, i swear it can change 3-5 tenths from your time

pimpscls

yea omg semptember in cali is hot as fuck, the rpms climb up so much slower. Wow i hate it. It seriously feels like 15.4 1/4 mile car the last two days

Chopsie

with the humid ass summer nights we have I swear it changed mine by whole seconds

Jimmbbo

Increased humidity does decrease performance, but high temps and high altitiudes are more of a worry....

I fly airplanes for a living, and we have correction tables that we use to determine the effects of elevation and temperature, but humidity is ignored altogether, so my read on this is that if the FAA doesn't take it into account for flying paying passengers, then it's gotta be a minor problem...

Cheers!

Jim

bigman

humidity does play a factor in a car, especially running on the track. I have ran strong on hot days with low humidity, but ran like shit on cooler days with high humidity. Humid air has more h2o in it, nuff said. cooler air is denser. Hot and humid days are even worse. When my acura was driven on hot humid days, i swore that an 89 civic would dust me. Then when winter time came, i couldnt eep the tires planted if i launched.

Pure Adrenaline

iTrader: (2)

Also has to do with the minor factor that tires are cold in winter time and can't get traction.

That's why I love Michigan fall. When it drops into high 50-s, low 60's, you can get just the right mount of traction, and car runs like a raped ape.

scalbert

http://www.acura-cl.com/forums/showthread.php?t=114733

Or just the single post:

http://www.acura-cl.com/forums/showp...49&postcount=6

Search is your friend.

dfreder371

Jimmbbo has it correct. (jimmbbo, what do you fly? I instruct.)

We have the 5 Hs' in flying.
[B]High, Hot, Humid and Heavy Hurt performance.

Jimmbbo

I fly as Captain on MD80s out of LAS...

Cheers!

Jim

dfreder371

Jimmbbo: Very cool! I was out in your area circa 1987. Went down the Colorado river for five days. Never forget the flight back to vegas on a Twin Otter (DHC-6, I think.) From where I was sitting, I could see the altimeter, we were 6,000 AGL, and in the midst of a big sandstorm. I didn't know sand could be lifted that high. Freaked me out. Also, the winds were blowing a mighty when we landed. Nearly F1 strength at Mckerron.

Back on topic. Air is made up primarilly of oxygen and nitrogen. When it is very humid out, the air is displaced by mostly hydrogen and oxygen. Take a look at any atomic chart and look at the atomic weights of the three elements involved. You will soon figure out that humid air is thin, not thick.

darrinb

ok just for reference, i was at the track 4 days ago, i went 14.5 on a 2.20 60' @97mph it was 85 degrees

today it was like 72 degrees and on another 2.20 60' i went 14.32 @ 98 mph, so from like 15 deg o gained 2 tenths and 1 mph