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Haltech altitude and air temp hp correction?

Old 11-18-04, 01:19 PM
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altitude and air temp hp correction?

anyone know how much hp is lost per 1000 ft or so eleation?

and a reasonably accurate idea of hp vs air temp. i've been told it's roughly 1% for every 10 degrees, but does anyone have a better idea?

thanks
Old 11-18-04, 05:16 PM
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SAE J1349
Old 11-18-04, 11:25 PM
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gracias...now i gotta find my damn calculator
Old 11-19-04, 03:24 AM
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Originally Posted by GUITARJUNKIE28
gracias...now i gotta find my damn calculator
This online calculator is probably somewhat accurate for most calculations:
http://www.wahiduddin.net/calc/calc_hp_dp.htm

There is also this one for force-inducted engines. I have only briefly looked at the calculations, but it seems like the guy has a good point.
http://home.austin.rr.com/turbolexus..._Dyno_Calc.htm
Old 11-19-04, 12:17 PM
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those are both great, but i don't have all the necessary info to plug in.
thanks for the help though, i'll make sure to pay attention to all those parameters next time.
Old 11-20-04, 03:41 AM
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Sea level is 29.92 inches of mercury. Divide outside air pressure in inches of mercy by 29.92 and that should be about your hp loss.

this chart was meant for airplanes. But pressure loss is linear up to 35,000 feet or so.
Attached Thumbnails altitude and air temp hp correction?-temp-altitude.gif  

Last edited by dustind; 11-20-04 at 03:44 AM.
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