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 120psi.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. The ranges above are base static fuel pressures only. FPD-XR base pressure requirement = 40 - 120psi (static)īase pressure is the fuel pressure measured when the fuel pump is running WITHOUT a vacuum line connected to the regulator.FPD-R base pressure requirement = 40 - 70psi (static).The FPD-R (Fuel Pulse Damper-Range) and FPD-XR (Fuel Pulse Damper-Extra Range) both have unique base "static" fuel pressure requirements: The FPD-R (green top) is slightly shorter than the FPD-XR (black top) allowing it to be used in space-constrained 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. The use of an inline damper is great for applications where there is not an option for direct fuel rail mounting.Īlong with having the flexibility 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. Many high performance OEM engines use an in-line fuel pulse damper from the factory including the Toyota 2JZ-GTE, Nissan VQ35DE, and Subaru EJ20/EJ25. Furthermore, a fuel pulse damper can help solve erratic lean air/fuel ratio spikes, commonly experienced as "stumbling", that are difficult to tune out. 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. In order to achieve a safe and consistent rail pressure, a fuel pulse damper (FPD) is often necessary. Not intended to be used directly on a fuel rail port.The opening and closing of fuel injectors creates pressure pulses in the fuel rail which can lead to unstable fuel pressure. Note: Not recommended for the low pressure side of mechanical fuel pumps. * The FPR-D can be mounted any direction including upside down * Mounting-the FPR-D assembly features two M6x1mm threaded mounting holes-a laser-cut anodized aluminum mounting plate with countersink M6x1mm bolts/nuts are included NPT auxiliary port can be used for monitoring fuel pressure, temperature, etc. * When installing, the O-rings require petroleum oil for lubrication to 14) threaded ports-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 in. * The integrated fuel pulse damper stabilizes fuel pressure created by the fuel pressure regulator, fuel pump, fuel injectors, etc.-base pressure is measured with the fuel pump running without a vacuum line connected to the regulator * With the addition of interchangeable return orifices, the fuel pressure regulator-damper is a good match for big to small, powered engines * Two interchangeable orifices are included to match the amount of fuel bypassed for the application-this added precision will resist diaphragm flutter and optimize pressure stability * Fuel pressure is dialed in using the preload set screw on top-unlike many others, the stainless steel adjustment screw has super fine threads for resisting vacuum/boost leaks and fine tuning fuel pressure * Compatible with all gasoline and alcohol blends of fuel including E85 It is a fully functional high performance pressure regulator with a unique built-in fuel pulse damper-an industry first!įuel pressure regulator with pulse damper features: Radium Engineering fuel pressure regulator with pulse dampers are the ultimate solution for consolidating critical fuel system components into a high-flow package. Radium Engineering Fuel Pressure Regulators with Pulse Damper Regulator is meant to be used on the return side of the fuel system, good up to 1,400 lph. Includes -6 AN and -8 AN fittings to configure regulator as needed.
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