Injector Sizing Calculator

FUEL INJECTOR SIZING CALCULATOR

Target Wheel Horsepower

400 WHP

Number of Cylinders

Fuel Type

Gasoline E85 Methanol

Max Duty Cycle

80%

Flow (cc/min) = (WHP × BSFC × 10.5) ÷ (cylinders × duty cycle)

BSFC (lb/HP/hr) —

Required Flow Rate —

INJECTOR RECOMMENDATIONS

Status	Injector	Size (cc)	Size (lb/hr)	Headroom

BSFC values: Gasoline ~0.50 lb/HP/hr, E85 ~0.65 lb/HP/hr, Methanol ~0.90 lb/HP/hr. Calculations assume standard fuel pressure (43.5 PSI for port, 200+ bar for DI). Always verify with your tuner.