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^^^ Once I run the car in Phoenix that will clear all the speculations. If the BMW ECU really compensate for altitude differences then I shouldn't run faster in Phoenix (Firebird,1900ft lower than the track in Tucson,SIR). But then that is what also they use to say on the Subaru WRX that its ECU compensates for altitude.
Again, I rather take it to the track and find out myself. I am though inclined to say that the car will run faster in Phoenix for the simple fact that even though the ECU compensate to raise the boost you still make the engine run smoother and not that hard at lower altitudes.
my .2c
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