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CPR Racing Injector Calculator

Estimate injector flow changes based on fuel pressure, convert between CC/min and lb/hr, and calculate injector size for horsepower goals.

Formula:

New Flow = Rated Flow × √(New Pressure ÷ Base Pressure)

Rated Flow: Base Pressure PSI: New Pressure PSI:

Formula: lb/hr = CC/min ÷ 10.5

CC/min:

Formula: CC/min = lb/hr × 10.5

lb/hr:

Formula: Injector Size = HP × BSFC ÷ Injectors ÷ Duty Cycle

Horsepower Goal: BSFC: Number of Injectors: Duty Cycle:

Typical BSFC: Naturally Aspirated 0.45–0.55 | Turbo/Supercharged 0.60–0.75 | Recommended max duty cycle: 80%.

CPR Racing — Total Fuel Systems
Injector Testing • Cleaning • Flow Matching • Full Motorsports Characterization

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