PSI and CFM are two different things. You can have the same boost on any turbo/supercharger, but the CFM is going to be different. In order for that to be accurate, Volumetric Efficiency in terms of CFM would have to be supplied into the equation.
For example, 20psi on a eaton M90 supercharger is around 600cfm and 20 psi on a 2.2 kenne belle twin screw blower is about 1500cfm at 20psi. The change in volumetric efficiency changes dramatically between those two blowers, therefore, the cylinder pressure would be lower for the M90 than the 2.2 kenne belle blower's cylinder pressure is.....
Thank you for the reply.