This $85 part seriously just cured a $h!tload of hassle I've had my tuner has tuned it all and couldn't tune these spots out. The FPD-XR fuel pulse damper is designed for vehicles with base fuel pressure between 43-78 PSI. I even installed it on the return side of the rail near the regulator, and it didn't make a difference as you stated. This $85 part seriously just cured a $h!tload of hassle I've had my tuner has tuned it all and couldn't tune these spots out. I only wish folks realized how important these are with certain fuel systems (namely upgraded systems still running batch injection vs sequential) That FPD-R solved every issue I had with lean spots in my entire rpm range after removing the stock damper a while back. Radium has always recognized the importance of fuel pulse dampers and has. Download the installation instructions for more info. This is done with a spring loaded flexible diaphragm inside of the damper housing. This product is safe for use with all fuel types including alcohol blends such as E85. 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. Along with having the flexibilty of using common fittings, Radium Engineering FPDs use a vacuum/boost reference port which allows for proper fuel pulse damper. The 8AN ORB version (right) seals using a FKM O-ring while the 3/8" NPT variation (left) seals with the tapered pipe threads. The anodized aluminum housing features two selectable threaded male fittings. Base static fuel pressure exceeds the 40-70psi requirement. Also, the vacuum/boost reference line does not need to be installed since maximum fuel pressure does not exceed 105psi.Ĭan I use a FPD-R? No. However, the vacuum/boost reference line must be installed.Ĭan I use a FPD-XR? Yes. Even though fuel pressure is 73.5psi at full boost, the FPD-R will work because the base static pressure was set within the 40-70psi requirement. 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.Ĭan I use a FPD-R? Yes. 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 - 70psi (static)įPD-XR base pressure requirement = 40 - 105psi (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. 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 RECOMMENDED FOR THE LOW PRESSURE SIDE OF MECHANICAL FUEL PUMPSĪlong 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. OEM quality damper features 3/8 NPT male thread with impregnated pipe thread paste. 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. The fuel cell surge tank (FCST) is designed to drop into any compatible fuel cell. This correction can be measured throughout the RPM range and can often help idle surge, especially with high flow injectors. Radium Engineering Universal Fuel Regulator/Pulse Damper Kit 10AN ORB. 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. Anodized aluminum body with male threads, 8AN ORB or 3/8" NPT Anodized and laser engraved aluminum top, R=range or XR=extra range
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