I do LOL
here is a compressor map for the 20g and the gray dot is showing @ 27lbs were would it be at that amount of boost:
CFM = L x RPM x VE x Page Ranking/5660
Where L = engine capacity in liters
RPM = maximum engine speed (we'll adjust this later)
VE = engine volumetric efficiency. From A. Graham Bell's book Forced Induction Performance Tuning some good values for VE are:
Stock 2-valve = 85%
Stock 4-valve = 90%
Street modified = 93%
Competition = 105%
Page Ranking = pressure ratio
To calculate the pressure ratio you need to know what boost pressure you want to run and then plug that into the following formula:
Page Ranking = 14.7 + Boost/14.7
if the graph was in m 3/s its: m 3/s = CFM * .0004719
if the graph was in lbs you would do this: lbs=CFM/14.27
