TUNING
Boost — pressure
Definition
The above-atmospheric pressure produced by a turbocharger or supercharger, measured in bar (gauge) or psi. Stock turbos typically peak at 0.8-1.4 bar (12-20 psi).
Why workshops care
Boost is the single biggest power lever on a turbo engine. Stage 1 software-only tunes add 0.1-0.3 bar over stock. Stage 3 hardware builds can run 2.0+ bar with the matching fuel system + intercooler.