Estimate power when adding boost to a given baseline, by pressure ratio.
The naturally aspirated or current power figure.
In bar or psi - the gauge pressure you plan to run.
Intercooling and engine efficiency mean you rarely get the full theoretical gain.
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.
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.
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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