Power Enrichment (PE)

The open-loop mode that commands a richer AFR under high load to make power and protect the engine.

Power Enrichment is the strategy that abandons the stoich cruise target and commands a richer mixture when the driver asks for power. It is triggered by throttle position, load, or RPM thresholds and pulls a commanded AFR (or lambda) from a PE table, typically in the high-12s for naturally aspirated gas and richer under boost. PE matters for safety: the extra fuel cools the combustion charge and reduces detonation risk exactly when cylinder pressure and heat peak, so a poorly set PE table is a fast route to a melted piston. In HP Tuners VCM Editor, PE lives under the fuel/Power Enrichment tables where you set the enable conditions and the commanded AFR by RPM. In VCM Scanner, log the PE-active flag plus wideband AFR to confirm PE engages when expected and that delivered AFR matches the command. Tune PE before adding boost or timing, with the wideband connected.