Quote:
Originally Posted by chbrules
Forced induction works worse at higher elevations (unless they're some new special setup BMW has to variable adjust them). The reason being that the air molecules are more spaced out, less pressure, which means it's harder to get the same amount of pressure into the combustion chamber. You will most likely see a visible decrease in performance if you go 4000ft+ above sea level.
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Lots of wrong information above. The 335i can boost something like an additional 3psi of manifold boost to help compensate for elevation. At 4,500 ft you are losing about 2.2 psi of air pressure. So the 335i will have no problem compensating at that elevation. In other word, at 4,500 ft a normally aspirated car will lose 15% of its power, the 335i only a few percent.