Use this calculator to determine the turbocharger requirements that best fits your setup.
Target Crank HP
# of Turbos1
Engine Displacement
# of Valves/Cylinder2
Max HP RPM3
Mid Range RPM4
Intercooler Type5
Fuel Type6
City, State or ZIP
Ambient Temp (°F)
Altitude (ft)
Air Pressure (psi)
MAX HP RPM Requirements
Air Flow (lbs/min)
@
Pressure Ratio
or
Boost (psig)
Mid Range RPM Requirements
Air Flow (lbs/min)
@
Pressure Ratio
or
Boost (psig)
So Now What?
You now have enough information to plot the above recommended operating points onto a compressor map. Compressor maps are included on each turbocharger product page as an image or download, if available from the manufacturer.
Click here for an image that overlays Mid Range RPM and Max HP RPM data points onto a sample compressor map.
Click here for an image that identifies the different aspects of a typical compressor map (efficiency islands, surge line, choke line, etc).
If you would like to learn more about compressor maps and turbocharger design and function, please visit the following manufacturer websites:
1 Single or parallel twin turbo setups only (not in series or compounded)
2 Used to determine Volumetric Efficiency (VE) depending on selection
3 RPM at which Peak HP is made; This will be the 2nd operating point on your
Compressor Map
4 RPM at which Peak TQ or Full Boost is made; This will be the 1st
operating point on your Compressor Map
5 Used to determine Intercooler Effectiveness and typical Pressure Drop depending
on selection
6 Used to determine Air Fuel Ratio (AFR) and Brake Specific Fuel Consumption (BSFC)
depending on selection