Radium Engineering FPD-R (Fuel Pulse Damper-Range) Inline Fuel Pulse Damper Kit (-8AN)
Radium Engineering FPD-R (Fuel Pulse Damper-Range) Inline Fuel Pulse Damper Kit (-8AN)
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HOW TO CHOOSE BETWEEN FPD-R VS FPD-XR:
The FPD-R (Standard Range) and FPD-XR (Extra Range) both have unique base/static fuel pressure requirements:
- FPD-R base pressure requirement = 40 - 70psi (static)
- FPD-XR base pressure requirement = 40 - 105psi (static)
Base pressure is the fuel pressure measured when the fuel pump is running WITHOUT a vacuum line connected to the regulator.
You should choose the damper that has a range that covers your base fuel pressure. If your base fuel pressure does not exceed 70psi, there is usually no advantage to using the extra range unit. The exception to this would be if your rising rate pressure exceeds 70psi, but never exceeds 105psi, and your falling rate under vacuum never moves under 40psi. In this scenario, the extra range damper would allow you to run without a vacuum line where the standard would require one.
IMPORTANT: 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.
Example 1
Vehicle: Mitsubishi EVO
OEM Base Static Fuel Pressure: 43.5psi
Boost Pressure: 30psi
Rising Rate Pressure Regulator? Yes
Can I use a FPD-R? Yes. Even though fuel pressure is 73.5psi at full boost and could be less than 40psi under vacuum, 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.
Can 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, but may need to be connected since it could fall under 40psi in vacuum.
Example 2
Vehicle: BMW E46 M3
OEM Base Static Fuel Pressure: 72.5psi
Boost Pressure: 20psi
Rising Rate Pressure Regulator? Yes
Can I use a FPD-R? No. Base static fuel pressure exceeds the 40-70psi requirement.
Can 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 and won't fall under 40psi in vacuum.
COMPATIBILITY:
Inline installation into fuel lines using 8AN ORB adapter fittings
Use the dimension data in the description to assure you have space for the damper around your port.
DAMPERS CAN NOT BE USED WITH MECHANICAL FUEL PUMPS.
DAMPERS CAN NOT BE USED WITH DIRECT INJECTION.
Mechanical fuel pumps and direct injection high pressure pumps create very intense pressure pulses that are and too strong for the diaphragms inside of pulse dampers. These pulses will rupture diaphragms in very short time.
INCLUDED Components:
Anodized and laser engraved aluminum top, R=range or XR=extra range
- Anodized aluminum body with male threads, 8AN ORB or 3/8" NPT
- Stainless steel hardware
- Rubber vacuum hose, 4mm ID
- Vacuum hose Y-fitting
SPECS & FEATURES:
8AN ORB versions seal using a FKM O-ring
- The 3/8" NPT variations seal with the tapered pipe threads (sealant should be used)
- Because 20-0178 and 20-0179 use tapered threads (NPT), the vacuum port can be clocked to the desired location during tightening
- Even after tightening, the newest 8AN ORB dampers (20-0776 and 20-0777) will swivel. This allows the vacuum port to be clocked 360 degrees.
