UdnUdnGTO said:Used to live in Wyoming. Figure that you will loose about 20% horsepower unless you have forced induction, That is a different story
fergyflyer said:I read an article somewhere, and these 2 numbers stuck. At 5,280 ft (one mile up) an average piston engine without forced induction loses about 25% of its hp. That means the guys in Denver really only get 300hp in their LS2's. You don't notice it so much unless you try to run a WRX or an EVO. The second part was at 10,000 ft the same piston engine loses about 60% due to the air thinning more rapidily as you go up in altitude. That means when you cross the Rockies coming out of Denver you have a 180hp GTO.
I'd bet Groucho would know the exact numbers.