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Turbos in high altitudes

>> Does a turbo make up for the loss of external air pressure - ie
>> charge
>> 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.