Loss of Power / Torque / Boost as Temp rise
27 April 2002, 09:54 PM
#2
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J,
I saw on another thread that Stephen Done reckoned he had lost 13BHP during the last week due to a 10degree celcius temperature rise
Might be an idea to pop back to PE for an RR when the temps higher ... would be good to know.
Steve
I saw on another thread that Stephen Done reckoned he had lost 13BHP during the last week due to a 10degree celcius temperature rise
Might be an idea to pop back to PE for an RR when the temps higher ... would be good to know.
Steve
29 April 2002, 03:56 PM
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You can work out the density change by some simple maths but there is a bit more to it than that 
every engine reacts slightly differently too, depending on a number of factors including the type of control system used ie MAF and/or MAP.
1% loss for every 10 deg F rise is a common yardstick used in the USA.
Andy
every engine reacts slightly differently too, depending on a number of factors including the type of control system used ie MAF and/or MAP.1% loss for every 10 deg F rise is a common yardstick used in the USA.
Andy
29 April 2002, 04:31 PM
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So this would roughly mean that for every 1.8 degrees that temperature changes on the Fahrenheit scale, temperature will change 1 degree on the Celsius scale.
Therefore 1 degree C means power goes down 0.556% i.e
Standard UK MY00 (218BHP) would loose 1.21BHP per degree C increase....
Ping you were right........
J
Therefore 1 degree C means power goes down 0.556% i.e
Standard UK MY00 (218BHP) would loose 1.21BHP per degree C increase....
Ping you were right........
J
29 April 2002, 07:29 PM
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Ooops
Your math's a bit out !
10 deg F = 6.25 deg C
1%/6.25 = 0.16% power loss per deg C
Therefore to calc power loss from 5C day to 20C day on say 280 bhp.
280 x (20-5) x 0.16/100 = 6.72 bhp loss = 273.28
Andy
Your math's a bit out !
10 deg F = 6.25 deg C
1%/6.25 = 0.16% power loss per deg C
Therefore to calc power loss from 5C day to 20C day on say 280 bhp.
280 x (20-5) x 0.16/100 = 6.72 bhp loss = 273.28
Andy
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30 April 2002, 04:16 PM
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Hi Cosie,
Looked at it your way and would say you were more correct than me , but then would slighty disagree as the scale is a shifted constant...
I.e.
http://www.memphis-schools.k12.tn.us...apages/F2C.htm
So for every change in degree F this is 0.5556 degrees C. Therefore 10degrees F (1% power change) would equal 5.56 degrees C
or for every degree C, 0.0018% approx = half a bhp on my 270bhp Car
...
Oh well whatever................
It a bu**ger
J
Looked at it your way and would say you were more correct than me , but then would slighty disagree as the scale is a shifted constant...
I.e.
http://www.memphis-schools.k12.tn.us...apages/F2C.htm
So for every change in degree F this is 0.5556 degrees C. Therefore 10degrees F (1% power change) would equal 5.56 degrees C
or for every degree C, 0.0018% approx = half a bhp on my 270bhp Car
...
Oh well whatever................
It a bu**ger
J
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