Radium RB25det Top Feed Fuel Rail – Nissan Skyline 20-0277

The Radium RB25det (NON Neo) fuel rail offers a clean easy solution to converting your RB25det engine to Top Feed Injectors. Proper fuel delivery is arguably one of the most critical components for those looking to make all the power they can safely and reliably. The RB25 side feed fuel rails are incredibly restrictive and impede the fuel delivery to the injectors under high fuel pressures. This is problematic for high power RB25 engine builds where having consistent fuel pressure is absolutely necessary. With the Radium Engineering Fuel Rail kit for the Nissan RB25det (20-0277) you can make sure that your fuel rail is able to flow all the fuel you can push through it!

Manufactured with a large 0.69″ internal bore, this top feed fuel rail will happily support over 1000HP when matched with a set of RB ID2600-xds injectors. The Radium fuel rail converts the OEM side feed fuel injector setup to top feed injectors, allowing the use of a wide variety of aftermarket fuel injectors available on the market.
This kit is compatible with E85.

Purchase any Radium Engineering fuel rail with a set of Injector Dynamics Injectors and get $50 credit to be used towards any of our E-tune services. We want to ensure all our customers builds are running strong and are here to support with our world renowned E-tuning services.

For thermal insulation, press-fit machined phenolic spacers and washers are included to completely isolate the fuel rail from heat transfer via the manifold and mounting bolts, as shown.

What’s Included:

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

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

NOTE: This fuel rail kit does NOT come standard with fittings. Please choose your inlet/outlet fitting from the drop down menu above or contact us with any questions. We recommend using -8an inlet fitting for anyone using E85 and planning to make over 700HP.

Recommended Injectors Dynamics fuel injectors that are a direct fitment with this Radium fuel rail kit using the short spacers:

• Injector Dynamics ID1050x-34-14-14
• Injector Dynamics ID1300-34-14-14
• Injector Dynamics ID1700-34-14-14
• Injector Dynamics ID2600-34-14-14 

Fuel Pressure Regulator Options:

The fuel rail can be plumbed to a remote aftermarket pressure regulator using -AN hose and fittings. Or the options below can be used to mount the pressure regulator directly to the fuel rail.

The front port on this fuel rail is compatible with the Radium Engineering Direct Mount Regulator with black top as shown below, or Radium Engineering Direct Mount Regulator with green top.

Optional Accessories:

Fuel Pulse Damper

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. The center -8AN ORB port on the fuel rail is an ideal location for a damper. It is compatible with Radium Engineering FPD-R (20-0176) or the Radium Engineering FPD-XR (20-0177), as seen in the picture below (on a KA24DE fuel rail the FPD is on the bottom in the center of the fuel rail) Not sure what damper to use, contact us and we will make sure you get the right one for your application!

Fuel Pressure Gauge

You can also easily install a Radium Engineering Mechanical Fuel Pressure Gauge (20-0029) using the center port on the fuel rail.