Boost Horsepower Gain

Estimate power when adding boost to a given baseline, by pressure ratio.

How it works

1

Enter baseline power

The naturally aspirated or current power figure.

2

Set target boost

In bar or psi - the gauge pressure you plan to run.

3

Add an efficiency factor

Intercooling and engine efficiency mean you rarely get the full theoretical gain.

Frequently asked questions

How much power does boost add?

Power scales roughly with the absolute pressure ratio: new power = baseline x (atmospheric + boost) / atmospheric x an efficiency factor. So about 1 bar of boost can nearly double power before losses.

Is the gain really proportional to boost?

Closely, because power follows air mass and air mass follows absolute pressure. The efficiency factor accounts for charge heating, intercooler losses and the engine not being optimised for boost.

Does the engine need other changes?

Yes - adding boost demands supporting fuelling, a safe compression ratio, good cooling and a proper tune. The number here is a planning estimate, not a guarantee.

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