Injector Flow at Pressure

LIGUORI DRAG RACING

Injector Flow at Pressure

Estimate injector flow at a different differential pressure, with your choice of output units.

A fuel selection fills specific gravity automatically. Specific gravity takes priority over the density override; clear it to use that override. Density is approximated from specific gravity using water ≈ 1 g/mL, without temperature correction.

Density override

ESTIMATED FLOW AT ACTUAL PRESSURE
— lb/hr

Equivalent values

Unit Value

Same-fuel estimate: new injector flow = rated flow × √(actual differential pressure ÷ rated differential pressure). Enter pressure across the injector, meaning rail pressure minus manifold pressure on the same reference basis. This relationship is for injectors, not fuel pumps. Confirm the injector’s operating limits and measured flow data.

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