How Much Horsepower Will Your Fuel System Support?
| HP*lb/hr||This is your Brake Specific Fuel Consumption. Choose between NA/Turbo and Piston/Rotary. Most turbo rotaries will use 0.62. You may also designate your own value.|
| psi||This is your base fuel pressure measured at the FPR or fuel rail. (No vacuum or boost)|
Input how many injectors you have, and how much fuel they flow at 43.5 psi (standard pressure) Enter values in cc/min or lbs/hr.
|Max Duty Cycle:|
| %||This is the maximum duty cycle that the injectors will see. The stock 3rd gen RX-7 ECU maxes out around 63%. The recommended maximum value for programmable ECU's is 85%. Anything above that can result in overheating and cause damage to the injector.|
| %||This is an approximation of the power lost in the transmission, differential, etc. Generally loss is between 15-20%|
| HP||With the above components, your fuel system should be capable of providing enough fuel for this amount of flywheel HP. This is comparable to manufacturers' HP ratings.|
| WHP||With the above components, your fuel system should supply enough fuel for this amount of HP at the wheels. This is the power that is measured on a chassis dynamometer.|
What Size Fuel Pump Do you require?
| psi||For normally-aspirated engines, enter zero. For turbocharged engines enter your max boost pressure|
|Fuel System Pressure Drop:|
| psi||All fuel systems will have a pressure drop from the pump to the rails, due to the lines, filter and other restrictive fuel system components. Enter this value here, if unknown use the default 15 psi.|
|Fuel Pump Requirements:|
|You need a pump that will flow:||Based on the above given parameters, you will need a fuel pump with these minimum requirements.|