Join Date: Feb 2001
Location: Atlanta, Georgia
If you're talking about engine RPM, then there's no way or saying for every engine at X RPM, a turbo is producing Y CFM. CFM produced by a turbo relative to engine RPM is based on MANY factors, the most important being engine displacement, compressor size, boost pressure, and to a lesser degree, volumetric efficiency and compressor efficiency.
So to answer your question, no, there is no catch-all way of calculating how much CFM is produced by every turbo for every engine combination across the RPM range.
That being said, if you're looking for a calculation on how much CFM a motor consumes at a given RPM, you can use this equation:
Theoretical CFM = (CID * RPM * VE)/3464
This will give you a THEORETICAL CFM, but it should be close enough for our purposes.
Once you know the answer to the equation above at the desired RPM, then you can use that to calculate how much CFM a turbo will produce at that RPM.