Fuel Injector Size Calculator (Other Fuel Injector Calculators have been moved to individual pages, check out the list HERE it's near the bottom of the page)
To use the Fuel Injector Size tool to select the correct size injector for your engine, fill out the above form with the specified data. Here are some hints -
Horsepower - Expected Horsepower of the engine build
BSFC - N/A engines will have a BSFC in the range 0.50, Supercharged and Turbocharged engines will want to be at 0.60 lbs/per plus
Number of Injectors - Number of Injectors used (often 1 per cylinder, but not always true)
Max Duty Cycle - Injector Duty Cycle should normally not be over 80% (0.80)
Fuel Pressue - The fuel pressure in your rails. Commonly set to 43.5 psi
The output graph shows a range of injector sizes vs. horsepower, hit the 'Sample' button to give it a try.
Remember these are ESTIMATES always consult your engine builder or tuner for final sizes and recommendations.