Obviously rpm on it's own is not a good indicator (you could be at 4Krpm and half throttle, which is not the same as 4Krpm and full throttle!)
Airflow is more promising though, because it is what we are running out of and we'd like to enhance.
Boost (well, absolute pressure) and airflow are the two axis in the compressor maps.
If we were to use one instead of the other, can you think of any pros or cons?
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