BSFC

Brake Specific Fuel Consumption, the fuel an engine burns per unit of power, used to size injectors.

BSFC (Brake Specific Fuel Consumption) is how much fuel an engine uses to make a given amount of power, typically in lb/hp/hr. A naturally aspirated gas engine sits around 0.45-0.50, while forced-induction builds run higher (~0.55-0.65) because they run richer and less efficiently under boost. BSFC matters mainly for sizing injectors and fuel systems: multiply target horsepower by BSFC and divide by injector count and target duty cycle to find the injector flow you need. Getting this right up front prevents the dangerous situation of running out of injector at peak power. It is a planning and selection figure rather than a table you edit, so it does not appear as a tunable parameter in HP Tuners VCM Editor; instead you use it before tuning to choose hardware, then verify in VCM Scanner that real injector duty cycle and wideband AFR stay safe at your power level. Treat a higher BSFC as the conservative, safer assumption when sizing.