Radium Engineering Fuel Pulse Damper Extra Range Inline Kit - 6AN

Description

NOT TO BE USED ON THE LOW PRESSURE SIDE OF MECHANICAL FUEL PUMPS (INCLUDING DIRECT INJECTION ENGINES).

Actual Product May Vary From Picture Shown.

The opening and closing of fuel injectors creates pressure pulses in the fuel rail; this 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.

Most high performance OEM engines use an in-line fuel pulse damper from the factory including the Toyota 2JZ-GTE, Nissan VQ35DE, Subaru EJ20/EJ25, etc. The use of an inline damper is great for applications where there is not an option for direct fuel rail mounting.

At 1.98" tall, the FPD-R (green top) is slightly shorter than the 2.60" FPD-XR (black top) allowing it to be used in space-contrained applications. But the FPD-XR has a wider response range. Radium recommends to use the FPD-XR if you have the space.

Features

These dampers feature an anodized aluminum housing with a large 0.69" center bore. They use two in-line inlet/outlet ports machined with 3/4"-16 UNF threads for 8AN ORB fittings. Depending on the size of the fuel feed hose used, there are 3 kits to choose from which include different male adapter fittings (-6AN, -8AN, barb). These fittings seal to the billet housing using FKM O-rings.

An 1/8" NPT female port is threaded into the center of the fuel pulse damper. A fuel pressure gauge is commonly used here or other sensors for pressure or temperature data.

Using the supplied M6 bolts/nuts, the FPD kit can be mounted at any possible angle including upside down. For best results, the damper should be plumbed as close to the fuel rail(s) as possible. Like any fuel system part, the FPD kit should be kept away from excessive heat areas. This product is safe for use with all fuel types including alcohol blends such as E85.

Included

- Anodized aluminum top, R=range or XR=extra range
- Anodized aluminum body with female -8AN ORB ports
- Anodized aluminum ORB adapter fittings, selectable size
- Gasoline and alcohol (E85) resistant diaphragm
- Stainless steel M6x1mm mounting bolts/nuts
- Rubber vacuum hose, 4mm ID
- Vacuum hose Y-fitting
- 1/8" NPT plug