psi boost for horsepower target calculator

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How much boost is required to generate the horsepower that you need? This calculates the boost (psi) to achieve a nominated horsepower target based on your engines specifications and maximum rpm. Great when planning a new turbo kit or intercooler to see if it can achieve your goals.

variabledescription
cubic inchesthe total cubic inches of displacement of the engine
maximum rpmthe maximum rpm of the engine
volumetric efficiencythe volumetric efficiency is a measure of the efficiency of the engine moving the intake charge into the chamber and the exhaust out. Typical values are as follows:

2 valve head – 80%

4 valve head – 88%

it is not unusual however to have VE’s of 95% or more in correctly built race engines
target horsepowerthe required flywheel horsepower of the engine
boostrequired psi of boost to achieve the horsepower target
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