Boost Pressure

The intake manifold pressure above atmospheric created by a turbo or supercharger, usually measured in psi.

Boost pressure is the amount of intake air pressure a turbocharger or supercharger produces above atmospheric (0 psi at sea level), measured in psi, bar, or kPa absolute. It is the single biggest lever on power output, but also on cylinder pressure and detonation risk. More boost packs more air into each cylinder, so fueling and timing must scale with it. Critically, commanded boost is not delivered boost: a wastegate duty or boost target you set in the tune is a request, and the actual MAP sensor reading is what the engine sees. Always log delivered boost and verify with a wideband before adding more. In VCM Scanner, monitor channels like MAP, Boost (psi), and Boost Target. In VCM Editor, boost-related limits and target tables live under the forced-induction or airflow sections of supported platforms. Raise boost in small steps, watching knock and AFR each pass.