Fuel Injectors/Fuel Pumps/Regulators

RSR Fuel Injection Systems and RSR AIC400 Additional Injector Controllers are designed to run high impedance (12 to 16 Ohm) fuel injectors. We use RC Racing Fuel Injectors exclusively because Russ Collins (The "RC" in RC Racing / RC Engineering) has the most sophisticated fuel injector testing and calibration facility in the industry...Russ has dynamic computerized flow benches that can test injectors from 50 to 50,000 rpm and measure flow rates accurate to the tenth of a cc per minute! We have seen too much variance in fuel injectors delivery to supply injectors that have not been "dynoed" to insure their accuracy.

Russ Collins is in the Motorcycle Hall of Fame for his drag racing innovations and exploits. We met Russ back in 1974 and he was one the sponsors of our Bol D'Or Endurance racing bikes back in 1977. He always aims high and that's why we use his fuel injectors. Russ has the most sophisticated flow benches in the industry and supplies top tier racing teams around the world.

RSR Closed Loop Fuel Injection ECUs can support both low and high impedance injectors. Up to 8 low impedance or up to 32 high impedance injectors.

RSR AIC 400 Additional Injector Controllers can support up to four (4) high impedance injectors. The RSR AIC 400 will support one (1) low impedance injector without a ballast resistor or up to two low impedance injectors with external ballast resistors.

Ballast resistors are commonly used on Toyota and Honda cars (early) and are a form of heat sink with a resistance value of around 7 ohms per injector. The ballast resistor is installed between the 12VDc battery positive and the fuel injector's 12VDc lead wire. The fuel injectors "ground" in the ECU to "fire" and the ballast resistor prevents the injector or ECU from overheating. Typically we never use the ballast resistors and stay exclusively with the below listed high impedance (12 to 16 Ohm) RC Racing Fuel Injectors...for a simple reason, they use less current.

Voltage / Resistance in Ohms = Current in Amps. Example: 13.8VDc / 16 Ohm = .8625 Amps; 13.8VDc / 2.5 Ohms = 5.52 Amps. As you can see the electrical amperage load increase rapidly with low impedance injectors.

RB Racing stocks the full range of RC Fuel Injectors, both high (12-16 Ohm) and low impedance (2-3 Ohm) styles.

High Impedance RC Racing Injectors are available in the below listed sizes, all rated at the industry standard of 3 BAR (43.5 psi). In as much as RSR Fuel Injection Systems typically run at 55psi, we have supplied both figures for each injector.

Low impedance injectors require special injector drivers and cannot be used in a system designed for high impedance injectors. Ohm's Law: 12V/2 Ohms = 6 Amps; 12V/14 Ohms = .857 Amps. Low impedance injectors open quicker than high impedance varieties...this is useful when using very large injectors with small opening times in the idle region and in very high speed operation (14,000 to 20,000 rpm) situations.

Static Flow and Pulsed Flow

For your information the flow rates are based on static flow i.e. the injector is shorted open by grounding one of the leads. However, when your vehicle is operating, the flow never acts this way. It is pulsed, not static. Pulsed flow, when the injector is pulsed to a 100% duty cycle, is about 90% of the figures shown. The rapid switching on and off of the solenoid does not hold the internal pintle or solenoid completely open as in the case of "shorting" it open.