// Performance Calculator

Fuel Injector Sizing Calculator

Estimate injector size based on horsepower target, fuel pressure, aspiration, and fuel type. Modeled after common injector sizing logic.

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Number of Injectors

Base Fuel Pressure (psi)

Your base/idle fuel pressure — default 43.5 psi (reference pressure)

Engine Aspiration

Turbocharged and supercharged engines use higher BSFC assumptions

Horsepower Desired

Horsepower Type

Crank HP used directly

Fuel Type

Duty Cycle (%)

85% is the commonly recommended maximum for most street/race applications

Enter a horsepower target above to see recommended injector sizing.