What is the difference between FPD-R and FPD-XR? This becomes essential for boosted systems that use a 1:1 rising rate fuel pressure regulator. NOT TO BE USED ON THE LOW PRESSURE SIDE OF MECHANICAL FUEL PUMPS (INCLUDING DIRECT INJECTION ENGINES).Īlong with having the flexibilty of using common fittings, Radium Engineering FPD's use a vacuum/boost reference port which allows for proper fuel pulse damper performance even at elevated fuel pressures. There are also other times when the fuel system benefits with a fuel pulse damper on the return line. For instance, there are cases where multiple dampers are necessary. There are many variables that dictate if a fuel system requires fuel pulse dampers. Furthermore, a fuel pulse damper can help solve erratic lean air/fuel ratio spikes, commonly experienced as "stumbling", that are difficult to tune out.įuel pulse dampers can be mounted at any angle, including upside down. This correction can be measured throughout the RPM range and can often help idle surge, especially with high flow injectors. The FPD's internal diaphragm will absorb oscillating pulses and stabilize fuel pressure. This product is safe for use with all fuel types including alcohol blends such as E85. Download the installation instructions for more info.The opening and closing of fuel injectors creates pressure pulses in the fuel rail this can lead to unstable fuel pressure. In order to achieve a safe and consistent rail pressure, a fuel pulse damper (FPD) is often necessary. For best results, the damper should be mounted directly onto the fuel rail(s). The FPDs can be mounted at any possible angle including upside down. The 8AN ORB (3/4″-16 UNF threads) version seals using a Viton O-ring while the 3/8″ NPT variation seals with the tapered pipe threads. The anodized aluminum housing features two selectable threaded male fittings. Vacuum/boost reference line must be hooked up to the FPD. The FPD-R cannot be used in this scenario.
#Radium fuel pulse damper install full
Notes: Even though fuel pressure is 92.5psi at full boost, the FPD-XR will work in this example because the base static pressure was set within the requirements.
No vacuum/boost reference hooked to FPD, port left open. Notes: The FPD-XR will work in this example because the base static pressure was set within the requirements. Notes: Even though fuel pressure is 63.5psi at full boost, either FPD-R or FPD-XR can work in this example because the base static pressure was set within the requirements. Any dynamic fuel pressure created by a rising-rate FPR outside of this range is acceptable, but only when the base “static” fuel pressure is set within these ranges and the vacuum/boost reference line is connected. IMPORTANT: The ranges above are base static fuel pressures only. The FPD- R (Fuel Pulse Damper- Range) and FPD- XR (Fuel Pulse Damper- Extra Range) both have unique base “static” fuel pressure requirements:įPD-R base pressure requirement = 40 – 45psi (static)įPD-XR base pressure requirement = 43 – 78psi (static)īase pressure is the fuel pressure measured when the fuel pump is running WITHOUT a vacuum line connected to the regulator. The FPD-R (green top) is slightly shorter than the FPD-XR (black top) allowing it to be used in space-contrained applications.
Furthermore, a fuel pulse damper can help solve erratic lean air/fuel ratio spikes, commonly experienced as “stumbling”, that are difficult to tune out.įor more in-depth information on the function of fuel pulse dampers, read the Radium blog HERE.Īlong with having the flexibilty of using common fittings, Radium Engineering FPD’s use a vacuum/boost reference port which allows for proper fuel pulse damper performance even at elevated fuel pressures. The FPD’s internal diaphragm will absorb oscillating pulses and stabilize fuel pressure. The opening and closing of fuel injectors creates pressure pulses in the fuel rail which can lead to unstable fuel pressure. In order to achieve a safe and consistent rail pressure, a fuel pulse damper (FPD) is often necessary.
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