ok I hate resurrecting dead threads but what MSU is saying goes against what i understand about turbo engines. I agree with his OP in regards to N/A engines.
My understanding of turbos says that the boost sensor reads the pressure inside the intake, (maybe thru the vacuum system, i'm not real clear on that) and regulates, using the waste gate, the boost at that point? I thought that was one of the advantages of boosted engines no matter what the outside atm pressure was the turbo maintained the correct pressure inside the engine. This is of course as long as the turbo doesn't reach it's "surge" line.
What am I missing?