This link
http://www.stealth316.com/2-turbotemp.htm
will allow you to imput:
1) Input Air Inlet Temperature to the compressor
2) Input Air Inlet Pressure to the compressor
3) Input Compressor Discharge Pressure from the compressor
4) Input Compressor Efficiency
It will then calculate the Compressor Discharge Temperature, The associated Pressure Ratio from the input data, and the Air Charge Density Ratio.
It will additionally Load the calculated results into the Inter-cooler Calculator portion of the program.
5) You can now input the Inter-cooler Efficiency (Example 8-%)
6) You can change the Inter-cooler Pressure Loss (hopefully less than 1 psi)
7) The last value to be inputted is the Ambient Temperature: Outside Air Temperature
if using an Air to Air Inter-cooler and the water temperature if using a Water to Air Inter-cooler. (Example 32 degree F Ice Water)
I use this program all the time at work. It seems to match reality very well.
Tom Vaught