12/28/2023 0 Comments Fuel pressure regulator radium![]() Also make sure you check for room where you plan to mount the damper, as the FPD-XR is quite a bit taller than the FPD-R version. Use the guide on the PRODUCT PAGE to select the damper to use. When it comes time to selecting a Radium fuel pulse damper, there are two decision that have to be made: tall or short version and connection type.Ĭhoosing between FPD-XR(tall) and FPD-R(short) is done based on fuel pressure, so it is imperative that the static (base) and maximum fuel pressures are known. Nissan SR20VE Fuel Rail with Radium fuel pulse damper installed in an auxilary port. If everything is running great, and fuel delivery is spot-on and there is no fuel line knocking noises, then a damper would not provide any benefit to the system.Ī damper IS NOT a magical "cure-all" for any fuel system problem or tuning issue! Most tuners are not concerned with the noise, but rather with the performance and seek constant, reliable fuel delivery throughout the RPM range in order to optimize the EFI tuning. High-frequency fuel pressure data logging is the best way to see fuel pulses and the impact a damper can have. If you are experiencing any of these issues, a damper could be a good solution.įurthermore, a fuel system that is plumbed with mostly hard metal tubing will be more susceptible to knocking and pulse issues than a system with a combination of hard tubing and flexible rubber hose.Ī dead-end fuel system, with the pressure regulating happening in the fuel tank, may be more prone to fuel line noise and a damper near the fuel rail should be considered. In some vehicles, these lean spots can result in stumbling during acceleration, commonly occuring in the 3k-5k RPM range. This issue can be aggravated by high-flowing aftermarket injectors. These are often the result of the hydraulic pulses acting in harmonic resonance with the injectors opening and closing. They can also contribute to uneven fuel delivery, and mysterious lean spots that are difficult to tune out. For some OEMs, the noise is not an issue and there are no negative effects on fuel delivery, so no measure is taken to address fuel pulsations.Īn OEM fuel pulse damper on the return line inside the fuel tankĪs mentioned earlier, fuel system pulsations can have an undesirable effect on cabin NVH (noise vibration and harshness) by causing fuel line "knocking". These measures can include rectangular cross-section fuel rails with a carefully tuned width and height, strategic location of the fuel pressure regulator, fuel lines mounted to the body using vibration isolating mounts, etc. In some cases, instead of a fuel pulse damper, you may find some other methods employed to attenuate the noise. Manufacturers never prefer to add cost to a vehicle. Most OEMs will utilize some method to attenuate the pressure pulsations. This is done with a spring loaded flexible diaphragm inside the damper.īelow is a graph showing fuel pressure fluctuations on a 4-cylinder engine, with and without a Radium fuel pulse damper installed. The fuel pulse damper works by allowing the volume of the fuel system to change slightly to absorb the pulses. These pulsations can be large enough to hear and feel, but are often undetectable with a liquid-filled analog mechanical fuel pressure gauge because they happen so quickly. Under certain circumstances, they can also cause issues with fuel delivery to the engine. These hydraulic pulses can cause an undesirable noise, which can be transmitted to the passenger compartment. Radium Engineering fuel pulse dampers are designed for use with high performance fuel systems, so damper benefits can be realized.Īn FPD is used in fuel injection systems to attenuate (absorb) pressure pulsations generated by the fuel pump operating and by the injectors opening/closing. these dampers are no longer as effective, or they must be removed for modifications. When modifications are made to the fuel pump, fuel rails, injectors, etc. OEM-grade fuel pulse dampers are specifically designed for the factory fuel system. Formerly only seen on OEM fuel systems, Radium Engineering is the first to introduce the FPD to the high- performance aftermarket. For many years Radium has been touting the benefits of a fuel pulse damper (FPD) in fuel injected systems.
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