In warm temps....

[Big.Z.hummin]

mine does that to when in the 90 to 100 degree range. i lose acceleration and when i step on it my stock air intake screams like a biotch. its kinda annoying but we dont have to many days over 90 here in nashville

[PHATBOYPIMP]

I didn't have this problem until I read this post.....lol

[porschett]

We average temps in the mid-90's, with heat indexes averaging 105 to 110. I've never experienced this.

[kchummer]

u may not know wat its capabilities are....lol

[porschett]

Originally Posted by kchummer

u may not know wat its capabilities are....lol

Let's see, 3 Porsche's, a DB9, 18 years racing, think I may have an idea or two about the capabilities of a truck!

[HummerMann]

Being a Northerner I don't notice this much, BUT when I was down in Langtry, TX last month in the middle of nowhere in 95F temperatures, I DEFINITELY noticed this phenomenon. It reminded me of being in the mountains - I agree that it all has to do with air density.
Hot air is less dense, so you produce less horsepower. When I used to drag race we'd place ice on the intake manifold and in a screen by the air cleaner to make the air more dense. If you use the standard Morton/McFaren horsepower/air density chart - 95 degrees gives you 12% less horsepower than on a standard day which is used by Detroit to measure engine horsepower. A standard day is sea level, 59F and a barometer of 29.92. Yep I have a graduate degree in mechanical engineering. SO 12% is a loss of about 36 horsepower.
Then you can complicate it even more using the Military Standard Hot Day which is used in certifying Humvee/H1 engines.
http://www.eng-tips.com/viewthread.c...=231931&page=2

[kchummer]

Originally Posted by porschett

Let's see, 3 Porsche's, a DB9, 18 years racing, think I may have an idea or two about the capabilities of a truck!

I was bein fececious...(? SP ?)....lol.....

[IRA51]

it is a fact that high underhood temps on a vehicle with an IAT sensor will suffer a loss of power and preformance in high heat. last week I had 165 degrees under hood temp (measured next to the air box ) all my vehicles run stronger in the winter here in Phoenix. If I drive up to Flagstaff in August you can feel the differance in power and preformance . and it is not just the altitude all my baro's are working fine.