![]() ![]() A laser-cut anodized aluminum mounting plate with countersink M6x1mm bolts/nuts are included. The FPR-D assembly features two M6x1mm threaded mounting holes. When installing, the NPT fitting requires PTFE paste for proper sealing. A plug is included if this port will not be used. This Radium fuel pressure gauge is commonly used. The 1/8" NPT auxiliary port can be used for monitoring fuel pressure, temperature, etc. When installing, the O-rings require petroleum oil for lubrication. Two -6AN and two -8AN adapter fittings are included to suit most aftermarket fuel systems. The inlet (side) port and outlet (bottom) port feature large 10AN ORB (7/8"-14) threaded ports. NOTE: Base pressure is measured with the fuel pump running without a vacuum line connected to the regulator. Any dynamic fuel pressure created by the rising rate FPR outside of this range is acceptable assuming the vacuum/boost reference line is connected. The base pressure requirement for maximum damping efficiency is 40-120psi (2.8-8.3bar). ![]() The integrated 1:1 fuel pulse damper stabilizes fuel pressure created by the fuel pressure regulator, fuel pump, fuel injectors, etc. Unlike many others, the stainless steel adjustment screw has super fine threads for resisting vacuum/boost leaks and fine-tuning fuel pressure. Furthermore, with the addition of interchangeable return orifices, the regulator is a good match for big to small powered engines.įuel pressure is dialed in using the preload set screw on top. This added precision will resist diaphragm flutter and optimize pressure stability. Two interchangeable orifices are included to match the amount of fuel bypassed for the application. This product is safe for use with all fuel types including alcohol blends such as E85. Download the installation instructions for more info.The 1:1 vacuum reference high flow design has been tested to regulate over 1,400 liters per hour. 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 version (right) seals using a Viton 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. 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. 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. 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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