I have noticed a lot of HP claims are made at 5000 feet of elevation

[14mins]

I was thumbing thru a few diesel mags and a lot of the claims made by programmers are made at high elevations. Some are over 5000 feet. I was told that the best HP is always made at or close to sea level, in fact a lot of dyno will self correct to sea level. What is the deal with these claims? Do turbo;s make more power at higher elevations or is it just the companies that are making these products located in higher elevations?

A few years back my partner and i did extensive dyno testing for the owner of MBRP when he was working on building his line of ATV exhaust. We were dynoing at 800 feet elevation. The owner of MBRP made me some one of a kind atv stuff, it was a shame i did not have a diesel truck at the time.

[AFBLUE]

I think its becuase Turbo engines loose less performance with altitude. Yes an engine will make the most amount of Hp at sea level. But if its a parts comparison they can say, oh look we added 120hp, when becuase of the altitude the hp was down 10% to start, which at sea level would only add 108hp.

[wingnut]

the only way a turbo will make more at altitude vs. a gasser is if you can turn the boost up as you go up.

in other words, the losses will be the same percentage-wise turbo to non-turbo as altitude increases with a non-adjustable turbo setup.

id say its just because of where their shop is...