So I think I got it. I used the T04z compressor map because after some research( I could be wrong) I think this is the closest I could find to the S25g....any who here are my plots, the two red dots on the map. I used Dave's IAT's, pressure loss on intake and compressor outlet, and VE. This is also based off my 2.0 motor so its a 122.04 CI instead of Daves 2.4.



Pressure Ratio
(18+14.7)/13.7=2.387

Airflow
420*12*(.55/60)=46.2 lbs/min

Calculated Manifold Pressure
(46.2*639.6*590)/(.98*4000*122.04)= 36.443-14.7=21.74psig boost @ 8k RPM

Compressor Discharge PSI
36.443+2=38.443 psia

Compressor Inlet PSI
14.7-1=13.7 psia

Pressure Ratio
38.443/13.7=2.806

Airflow Actual
(38.443*.98*2250*122.04)/(639.6*590)=27.41 lbs/min @4500 RPMS

Something just doesn't seem right though. Maybe someone will correct me :P