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Turbos in high altitudes
>> Does a turbo make up for the loss of external air pressure - ie
>> pressurization is the same regardless of altitude? Would the knock
>Depends on how they program the wastegate in the computer. Most likely they
>allow a maximum Absolute pressure which would mean that there would be
>no loss in power.
I'd make that a maybe. There will be loss if the turbo as sized can't manage
the additional volume (not mass, which is volume x density) of airflow needed
to fully pressurize the engine at high rpms. That's always a trade-off; small turbos
result in reduced lag but can only move "X" ft^2 of air. Larger ones can move
more air, but lag more.