How much does temperature affect H.P?
09-29-2003, 08:38 PM
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St. Jude Donor '06
How much does temperature affect H.P?
It's starting to cool off up here and my car feels like it's just ripping lately! :steering: Feels like an extra 20 horse. :reddevil I love it! Traction's a problem on the cold asphalt though.
:p:
:p:
09-29-2003, 08:44 PM
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Re: How much does temperature affect H.P? (lager99)
You are probably correct. On a car like our C5's the ambient temperature can pretty easily swing the rwhp by 30. I have personally seen a 2 MPH difference in the quarter mile and hour trap speed just from 90 degrees to 60 degrees.
09-29-2003, 08:53 PM
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Re: How much does temperature affect H.P? (jschindler)
Wow!! :eek: That's huge! I'd like to dyno it at these temps. :thumbs:
09-29-2003, 09:00 PM
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Re: How much does temperature affect H.P? (lager99)
There is a member on this forum who is in Alaska and drove his Vette in something like -20 degree temperatures! He said it was like his stock C5 was like a Z06! I have driven my modded Vette in 20 degree clear cold temperatures, and it was like a different car!
09-29-2003, 09:11 PM
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Re: How much does temperature affect H.P? (lager99)
you get a 1% increase in HP for every 10 degrees you lower the intake air temp. :chevy
09-29-2003, 10:09 PM
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Re: How much does temperature affect H.P? (lager99)
10 degrees cooler (intake temp) will gain you about 1% horse power
[Modified by Evil-Twin, 8:46 AM 9/30/2003]
[Modified by Evil-Twin, 8:46 AM 9/30/2003]
09-29-2003, 10:17 PM
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Re: How much does temperature affect H.P? (clem zahrobsky)
you get a 1% increase in HP for every 10 degrees you lower the intake air temp. :chevy
09-29-2003, 10:42 PM
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Re: How much does temperature affect H.P? (BLU-BY-U)
Those #'s conflict each other. :skep:
09-29-2003, 10:48 PM
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Re: How much does temperature affect H.P? (lager99)
I've heard that every ten degree drop is a 3% dain in horsepower. If you do the math this turns out to just over a 1 horsepower gain for every 1 degree drop in temperature on a stock ls1.
09-29-2003, 11:17 PM
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Re: How much does temperature affect H.P? (lager99)
Assuming the pressure stays the same...
Correction factor (Cf)
Temperute in Celsius(Tc)
Cf=1.18((Tc+273/298)^0.5)-0.18
So at 25 degrees C, the CF is 1 (STP or around room temp)
http://wahiduddin.net/calc/cf.htm
So its ~1.11% hp per 10degrees F temp change (no humidity or pressure changes)
[Modified by Midwayman, 4:24 AM 9/30/2003]
Correction factor (Cf)
Temperute in Celsius(Tc)
Cf=1.18((Tc+273/298)^0.5)-0.18
So at 25 degrees C, the CF is 1 (STP or around room temp)
http://wahiduddin.net/calc/cf.htm
So its ~1.11% hp per 10degrees F temp change (no humidity or pressure changes)
[Modified by Midwayman, 4:24 AM 9/30/2003]
09-30-2003, 10:42 AM
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Re: How much does temperature affect H.P? (Midwayman)
Assuming the pressure stays the same...
Correction factor (Cf)
Temperute in Celsius(Tc)
Cf=1.18((Tc+273/298)^0.5)-0.18
So at 25 degrees C, the CF is 1 (STP or around room temp)
http://wahiduddin.net/calc/cf.htm
So its ~1.11% hp per 10degrees F temp change (no humidity or pressure changes)
[Modified by Midwayman, 4:24 AM 9/30/2003]
Correction factor (Cf)
Temperute in Celsius(Tc)
Cf=1.18((Tc+273/298)^0.5)-0.18
So at 25 degrees C, the CF is 1 (STP or around room temp)
http://wahiduddin.net/calc/cf.htm
So its ~1.11% hp per 10degrees F temp change (no humidity or pressure changes)
[Modified by Midwayman, 4:24 AM 9/30/2003]
09-30-2003, 11:01 AM
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St. Jude Donor '03-'04
Re: How much does temperature affect H.P? (lager99)
My old vert would turn 13 flat in the middle of the FL summer and on a nice cold day this past Jan at Gainesville Raceway she turnd a 12.47 :eek: :D
So my answer is about 1/2 second depending on the temp swing :)
So my answer is about 1/2 second depending on the temp swing :)
09-30-2003, 06:56 PM
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Re: How much does temperature affect H.P? (Midwayman)
A couple of years ago when tuners were working on the 160 degree stats etc one of them found that a stock ls1 produced max power at 178 degrees on the dyno, he also stated that at 200 degrees it cost about 15 rwhp. FWIW
