Description

This fuel rail conversion kit is compatible with the Version 1-6 Subaru STi 4-cylinder engines.

It
 converts the OEM side feed fuel injector setup to top feed, allowing the use of high flow fuel injectors (not included). The fuel rail injector bores are 14mm ID. Each rail features a large internal bore to suit even the most fuel hungry engines. They are CNC machined from solid 6061 aluminum, black anodized, and laser engraved for a high quality surface finish. All 6 fuel rail ports are tapped with 8AN ORB (3/4"-16) threads

Machined phenolic mounting spacers and washers are included to completely isolate the fuel rail from heat transferred from intake manifold and mounting bolts. 

This fuel rail conversion kit is compatible with all fuel types including popular alcohol mixtures such as E85. The four included machined injector seats press into the intake manifold and seal air tight. They are anodized and laser etched and are designed for 14mm diameter lower O-ring injectors.

Compatible injectors to use will need a 48mm body and 14mm Top and Bottom O-Rings. Below are some of the many fuel injectors that are a direct fitment with this Radium fuel rail kit:

  • 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 
  • Deatschwerks 17U-00-0050-4
  • Deatschwerks 17U-00-0060-4
  • Deatschwerks 17U-00-0072-4
  • Deatschwerks 17U-00-0095-4 
  • Deatschwerks 16S-12-2200-4 

NOTE: This fuel rail kit does not come with hoses or fuel rail port fittings. These are sold in a range of sizes seperately.

Do I need a pulse damper?  

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 oscillating pulses and stabilize fuel pressure. This correction can be measured throughout the RPM range and can often help an erratic surging idle. 

The optional Radium 20-0176 fuel pulse damper can be used in any of the three -8AN ORB ports on these fuel rails. 

Want to reuse the OEM Subaru FPR?

If the OEM 2-bolt flanged FPR will be reused, select one of the OEM FPR options above. The 20-0301 OEM FPR adapter is commonly used with EJ20 engines and 20-0303 is used with EJ25 engines (excluding STi). MEASURE YOUR OEM FPR BEFORE ORDERING. These adapters can be used in any of the ports and permits properly clocking for appropriate fitment. 

 

Specifications

Compatibility

  • 1994-2000 Subaru WRX/STi (V1-V6)
  • 1994-2000 Subaru WRX/STi (V1-V6)

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