How to Use the Injector Size Calculator

• Enter your target horsepower (crank HP, not wheel HP).
• Enter your engine's cylinder count — this assumes one injector per cylinder.
• Select your fuel and induction type; this sets the BSFC used in the formula.
• Choose a max duty cycle. 80% is the industry-standard safe ceiling — pick a lower value to leave more headroom.

💡 Tip: Always round up to the nearest common injector size, and check with a tuner before installing injectors sized far beyond your current fuel system's capacity.