Altitude = lost HP & Trq????

[tm06r1]

I am a believer, coming from sea level...Does anyone know the avg lost horsepower and/or torque due to altitude....Sorry if it's been posted before...I haven't seen it. Thanks

[Bueller]

Go ride Mount Evans or over Trail Ridge, then you will know true loss of power :(

[Mel]

I could be wrong, but I believe mathmatically, it is something like 3 or 3.5% per 1000ft of elevation over 1000ft.

Power (or loss of power) is a factor of atmospheric pressure....the higher the pressure, the more oxygen is available for combustion, and the better the power output. As you go higher in altitude, your atmospheric pressure goes down and there is less oxygen forced into your motor for combustion. That is why things like NOS or pure oxygen boosters on a vehicle makes such a difference (forces additional oxygen straight into combustion chamber).

Wickipedia Definition of Atmospheric Pressure (and calculations): http://en.wikipedia.org/wiki/Atmospheric_pressure

[The Joker]

Horsepower loss at altitude:
Note: elevation in feet. hp loss = elevation x 0.03 x hp @ sea level
1000

[Clarkie]

I know on my GSXR1000 race bike the 'corrected' hp (to seas level) is around 180hp, uncorrected is around 145-150hp. the pucker factor would be a lot bigger at sea level racing my bike, although we go to Hastings next weekend which is around 1000 feet so it could be high-side city for a few people :banghead:

[tm06r1]

http://www.slowgt.com/Calc2.htm#BasAltCal

Thanks for your replies...very helpful.

I found this as well. It is a HP converter. From sea level (863 ft) to Denver (5280 ft) a 155 hp ride will do 131 hp. That is a crazy loss...Thanks again.......:turtle: