Radium: Top Feed Fuel Rail Conversion Kit - Nissan RB25DET

This Radium Engineering fuel rail kit is a direct bolt-on with the RB25DET (non NEO) engines originally found in the R33/R34 Nissan Skyline GTS-T. It features a large 0.69" internal diameter bore to suit even the most fuel hungry engines. The Radium fuel rail converts the OEM side feed fuel injector setup to top feed allowing the use of high flow 14mm O-ring fuel injectors (not included). This kit is compatible with E85.



The rail is extruded and CNC machined from solid 6063 aluminum and black anodized for a high quality surface finish.

Included
- Black Anodized Aluminum Fuel Rail
- Phenolic Mounting Bolt Spacers, Short (x3)
- Phenolic Mounting Bolt Spacers, Tall (x3)
- Phenolic Mounting Bolt Washers (x3)
- Radium 20-0161-06, 25mm Injector Seats
- Stainless Steel Mounting Bolts, Short (x3)
- Stainless Steel Mounting Bolts, Tall (x3)



NOTE: Fittings can be purchased separately using the options above.

Fuel Injector Compatibility
The kit includes 2 sets of phenolic spacers (shown above in the kit contents) to suit multiple height injectors. The spacers are machined from phenolic material and offer excellent resistance to heat transfer.



Use the tall spacers and longer mounting bolts to accomodate this size injector:



Below are some of the many fuel injectors that are a direct fitment with this Radium fuel rail kit using the tall spacers:

Injector Dynamics ID725-48-14-14
Injector Dynamics ID850-48-14-14
Injector Dynamics ID1000-48-14-14
Injector Dynamics ID1050x-48-14-14
Injector Dynamics ID1300-48-14-14
Injector Dynamics ID1700-48-14-14
Injector Dynamics ID2000-48-14-14

Use the shorter spacers and mounting bolts to accomodate this size injector:


Below are some of the many fuel injectors that are a direct fitment with this Radium fuel rail kit using the short spacers:

Injector Dynamics ID850-34-14-14
Injector Dynamics ID1050x-34-14-14
Injector Dynamics ID1300-34-14-14
Injector Dynamics ID1700-34-14-14
Injector Dynamics ID2000-34-14-14

NOTE: Fuel Injectors are NOT included and must be purchased elsewhere.

Port Configuration
The fuel rail has four -8AN ORB threaded bosses. Two of the ports are located on the bottom. Use the options above to select the appropriate adapters for your specific application.



Do I need a pulse damper (FPD)?
The opening and closing of the 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 pulse damper should be used (especially with high flow injectors). The internal diaphragm will absorb oscillation pulses and stabilize fuel pressure.



Fuel Pressure Regulator Options
Depending on the chassis and hood clearance, a Radium Direct Mount Regulator (DMR) may be used in one of the ports.



To reuse the factory fuel pressure regulator, select part number 20-0303 (shown below).



For Nissan RB25DET. Please select from the options on the right.

Stock images used. Actual product may vary.