{"product_id":"20-0178","title":"Radium FPD-R Fuel Pulse Dampener - 3\/8\" NPT","description":"\u003cp\u003eThe 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. The FPD's internal diaphragm will absorb oscillating pulses and stabilize fuel pressure. This correction can be measured throughout the RPM range and can often help idle surge, especially with high flow injectors. Furthermore, a fuel pulse damper can help solve erratic lean air\/fuel ratio spikes, commonly experienced as \"stumbling\", that are difficult to tune out.\u003c\/p\u003e\n\n\u003cp\u003eWhat makes Radium FPDs unique?\u003c\/p\u003e\n\n\u003cp\u003eAlong 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 becomes essential for boosted systems that use a 1:1 rising rate fuel pressure regulator.\u003c\/p\u003e\n\n\u003cp\u003eWhat is the difference between FPD-R and FPD-XR?\u003c\/p\u003e\n\n\u003cp\u003eThe FPD-R (green top) is slightly shorter than the FPD-XR (black top) allowing it to be used in space-contrained applications.\u003c\/p\u003e\n\n\u003cp\u003eWHICH DAMPER DO I CHOOSE?\u003c\/p\u003e\n\n\u003cp\u003eThe FPD-R (Fuel Pulse Damper-Range) and FPD-XR (Fuel Pulse Damper-Extra Range) both have unique base \"static\" fuel pressure requirements:\u003c\/p\u003e\n\n\u003cp\u003eFPD-R base pressure requirement = 40 - 70psi (static)\u003cbr\u003e\nFPD-XR base pressure requirement = 40 - 105psi (static)\u003cbr\u003e\nBase pressure is the fuel pressure measured when the fuel pump is running WITHOUT a vacuum line connected to the regulator.\u003c\/p\u003e\n\n\u003cp\u003eIMPORTANT: The ranges above are base static fuel pressures only. 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.\u003c\/p\u003e\n\n\u003cp\u003eExample 1:\u003c\/p\u003e\n\n\u003cp\u003eVehicle: Mitsubishi EVO\u003cbr\u003e\nOEM Base Static Fuel Pressure: 43.5psi\u003cbr\u003e\nBoost Pressure: 30psi\u003cbr\u003e\nRising Rate Pressure Regulator? Yes\u003cbr\u003e\nCan I use a FPD-R? 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. However, the vacuum\/boost reference line must be installed.\u003cbr\u003e\nCan I use a FPD-XR? Yes. Also, the vacuum\/boost reference line does not need to be installed since maximum fuel pressure does not exceed 105psi.\u003cbr\u003e\nExample 2:\u003c\/p\u003e\n\n\u003cp\u003eVehicle: BMW E46 M3\u003cbr\u003e\nOEM Base Static Fuel Pressure: 72.5psi\u003cbr\u003e\nBoost Pressure: 20psi\u003cbr\u003e\nRising Rate Pressure Regulator? Yes\u003cbr\u003e\nCan I use a FPD-R? No. Base static fuel pressure exceeds the 40-70psi requirement.\u003cbr\u003e\nCan I use a FPD-XR? Yes. Also, the vacuum\/boost reference line does not need to be installed since maximum fuel pressure does not exceed 105psi.\u003cbr\u003e\nFeatures:\u003c\/p\u003e\n\n\u003cp\u003eThe anodized aluminum housing features two selectable threaded male fittings. The 8AN ORB version (right) seals using a Viton O-ring while the 3\/8\" NPT variation (left) seals with the tapered pipe threads.\u003c\/p\u003e\n\n\u003cp\u003eThe FPDs can be mounted at any possible angle including upside down. For best results, the damper should be mounted directly onto the fuel rail(s).\u003c\/p\u003e\n\n\u003cp\u003eThis product is safe for use with all fuel types including alcohol blends such as E85. Download the installation instructions for more info.\u003c\/p\u003e\n\n\u003cp\u003eIncluded:\u003c\/p\u003e\n\n\u003cp\u003eAnodized and laser engraved aluminum top, R=range or XR=extra range\u003cbr\u003e\nAnodized aluminum body with male threads, 8AN ORB or 3\/8\" NPT\u003cbr\u003e\nStainless steel hardware\u003cbr\u003e\nRubber vacuum hose, 4mm ID\u003cbr\u003e\nVacuum hose Y-fitting\u003c\/p\u003e","brand":"Radium Engineering","offers":[{"title":"Default Title","offer_id":50988625789245,"sku":"20-0178","price":155.39,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/7548\/3197\/files\/20-0178.jpg?v=1763118861","url":"https:\/\/www.modsdirect.com.au\/products\/20-0178","provider":"ModsDirect","version":"1.0","type":"link"}