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T77911S T77911S is offline
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Join Date: Oct 2006
Location: MYR S.C.
Posts: 10,197
winrice you got me to thinking. i found the site. 7k ft has a pressure of 11.3psi vs 14.7 here at sea level. i have a mech RUF gauge and it reads 0 witht he engine off. i may be wrong on this but his may read -.2bar down from 0.

i dont think that is right when you say .6bar would =.8 bar of boost, if you are talking about when the turbo is actually making pressure. i say that because the boost gauge is measuring pressure inside the intake system. think of the intake as being sealed and the turbo os pressurizing it. duuuuh i just realized why he is only getting .6 bar thanks to you.

here at sea level i have 14.7 psi HELPING the spring close the waste gate. at 7k ft, he has .2bar LESS pressure (or only 11.3 psi) trying to close the wastegate. with .2bar less pressure keeping the WG closed, it is now opening at .6 bar instead of .8.

the exhaust gas also helps to open the WG but i dont know how much it would help.

Air Pressure and Altitude above Sea Level
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Old 05-30-2014, 08:46 AM
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