Quote:
Originally Posted by rentedmule
you boost the same PSI at altitude, it's just that the air is less dense and contains less O2 hence you make less power.
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Correct.
Maybe a better way to explain it is, that the boost (pressure over ambient) is the same, but the absolute intake manifold pressure is lower because the ambient pressure is lower at altitude.
The % O2 is the same at altitude, just the pressure/quantity of air is less.