Note: Most EFI systems operate at 43.5 psi (3Bar) static fuel pressure. With the Radium FPR-D, simply spin the set screw clockwise to achieve higher pressures. Note: if an OEM fuel pressure regulator is used for 640LPH, it will likely not be able to bypass enough fuel. This test was performed with the adjustment screw completely backed out, no preload.įor example, if you have two pumps that flow 320LPH (total 640LPH), the approximate minimum pressure the regulator can achieve is about 23.5 psi. The graph below shows the minimum fuel pressure the regulator can achieve as a function of pump flow rate. This product IS NOT intended to be used directly on a fuel rail port. The FPR-D can be mounted any direction including upside down. 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 auxilary port can be used for monitoring fuel pressure, temperature, etc. Radium Engineering - Fuel Pressure Regulator - 08-17 Subaru STI This kit is designed for use in the USDM 2008-2018 Subaru WRX STi (EJ257 only) and replaces. 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 adjustament 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. The 1:1 vacuum reference high flow design has been tested to regulate over 1,400 liters per hour (see MORE DETAILS tab). The FPR-D is 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. The Fuel Pressure Regulator-Damper (FPR-D) is the ultimate solution for consolidating critical fuel system components into a high-flow package.
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