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Radium Top Feed Fuel Rail for Nissan SR20DET S14/S15

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This Nissan Silvia fuel rail kit is specifically designed for SR20DET S14/S15 style intake manifolds. For the SR20DET S13 fuel rail kit, goHERE. It features a large 0.69" internal diameter bore to suit even the most fuel hungry engines. 

The rail is CNC machined from solid 6061 aluminum and black anodized for a high quality surface finish. The included hardware mounts the fuel rail to the OEM intake manifold bosses.

The Radium fuel rail converts the OEM side feed fuel injector setup to top feed, allowing the use of high flow fuel injectors (not included). The fuel injector bores are 14mm ID. Note: Top feed fuel injectors designed for 11mm bores can be used by switching the top O-rings to 14mm style O-rings.

The kit is designed for specific upper and lower O-ring spacing, as depicted above. Different height injectors can be used, but longer or shorter spacers and hardware may be required. Below are some of the many fuel injectors that are a direct fitment with this Radium fuel rail kit.

To resist oxidation corrosion, the lower billet aluminum injector seats are anodized and laser etched. They are O-ring sealed and designed for 14mm top feed injectors.  This kit is compatible with all fuel types including popular alcohol mixtures such as E85.

The OEM 2-bolt IACV bypass hard line is replaced by a billet aluminum IACV spacer kit to gain clearance for the top feed fuel rail. An anodized aluminum barb adapter and rubber hose is supplied to reroute the charge pipe hose externally to the manifold. One gasket is included for the IACV spacer. To purchase an additional to replace your original IACV gasket, go HERE.


All parts listed below are included for a trouble and leak-free installation.

-Black Anodized Aluminum Fuel Rail
-Green Anodized Aluminum Mounting Bolt Spacers (x3)
-Radium 20-0161, Green Anodized Aluminum 25mm Injector Seats (x4)
-Radium 20-0162, Black Anodized Aluminum IACV Spacer Kit
-Radium 18-0014, IACV Gasket, SR20DET S14/S15 (x1)
-Black Anodized Aluminum IACV Barb Adapter 
-Rubber Hose and OEM Clamp for IACV
-Stainless Steel M8x1.25 Mounting Bolts (x3)
-Stainless Steel M6x1 Mounting Bolts (x3)

 Note: This fuel rail kit does NOT come standard with fittings (see port configurations below).


The rear inlet port uses 3/4"-16 female O-ring port threads to accept -6AN, -8AN, or -10AN adapter fittings for custom high flow fuel system builds. The front port uses 3/8" NPT female threads which permits the use of our fuel pulse damper, a -6AN or -8AN adapter, or a billet adapter to reuse the stock FPR. On the bottom of the fuel rail there is another 3/8" NPT port for a -6AN or -8AN center port, pulse damper, or it can be plugged. 

NOTE: If a gauge or sensor is required for monitoring fuel pressure, use this -6AN inline adapter HERE. It requires a -6AN male adapter to be used on the front or rear port. This Radium Engineering fuel pressure gauge HERE can be used with this -6AN inline adapter fitting.

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 oscillation pulses and stabilize fuel pressure. This correction can be measured throughout the RPM range and can often help an erratic surging idle. The fuel pulse damper can be used in either 3/8" NPT port. 

Radium Engineering products are made in the USA.


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