I could put some sort of restriction in the return line "like a pill" so that it does now allow return fuel as easily and helps the FPR to not regulate so wildly. That is the pulsing I am feeling in the line. This leads me to believe that I am over working the spring as it is letting pressure out then quickly goes back to stable then quickly back out again. Which looking deeper at it the return on it is also larger. My regulator is BIG and allows a lot of flow as it was designed to do CARB as well as PI. But after some more fiddling I believe I know what part of the issue is at least why mine is more pronounced. Welp the noise is back, still not as loud but still annoying. Here is the cabin, you can hear it at idle and see what it sounds like under light throttle. Here is the Gauge and how it looks at idle. I will then try it will the PI rail involved. I will adjust pressure and see how it does. Like the image below but without the PI rail at first. I am also going to re-route my setup so that the FPR is before the HPFP and on a single line removing the Y adapter. Jumper the Fuel Pump Resistor "thing on the frame rail that says hot don't touch" Was hoping this would keep the pump and full power and it would not pulse, it did not help. This did not change anything and might have made it more prevlant. Injectors: 1200cc fuel injector for MITSUBISHI EVO X 4B11T BOSCH style EV14 EvolutionĨan feed line from Fuel Pump to 8an-6an-6an Y adapterīypass PI rail but keep regulator "on Y goes to reg one Y goes to HPFP" With any throttle it will go away but returns at idle.įuel Pump: WALBRO HELLCAT 525LPH F90000285įuel Pressure Regulator: Aeromotive Universal Bypass Regulators 13301 It sounds like someone is drumming under the car and against the firewall. It is noisy but the car seems to run without issue. This pulse can be both heard and felt in the return line. The issue I have noticed is that the FPR is pulsing, it will pulse + or - 3psi at idle. I thought I was alone in this but it appears that and have similar issues. NOTE: If the 20-0556-PK plumbing kit (listed above) was purchased, this adapter can be used in the spare top port, as shown below.I finished my port injection setup and I have noticed a strange issue. The OEM VR38DETT fuel pulse damper can be reused with this adapter. These can install into any fuel rail port provided there is adequate clearance. Two Radium fuel pulse dampers and a pressure gauge are included and all necessary adapter fittings. PTFE fuel lines run from the FPR to the rear fuel rail ports. Low profile 90 degree SAE adapters with PTFE fuel hoses connect the OEM hard fuel lines to the FPR. When used with the 20-0556-02 fuel rails, this kit permits a bolt-on, plug and play affair.Ī stainless steel mount if provided for the Radium FPR. NO FITTINGS ARE INCLUDED.Ģ0-0556-PK Fuel Rail Plumbing, Nissan R35 GT-R There is also opportunity to plumb the fuel rails in parallel or series.Īs shown below, the base kit (P/N: 20-0556-02) includes ONLY the fuel rails and associated mounting hardware. With 4 ports on each rail (8 total), it is easy to add fuel system accessories such as a pressure transducer, fuel pulse dampers, etc. Additionally, the OEM injector clips can be reused, as shown below. The unique lower intake manifold mounting points permit shorter less restrictive rails. The fuel rails mount with phenolic spacers and washers for 100% fuel insulation from the hot intake manifold. The fuel rail features 14mm injector bores and is compatible with the OEM injectors and any aftermarket injectors with OEM VR38DETT fitment. Each rail has four 8AN ORB ports (2 end ports and 2 top ports for a total of 8 ports). They are machined from 6061 aluminum and anodized black for compatibility with all popular fuel types including E85. Manufactured with a large internal bore, the fuel rail can support all necessary engine power requirements. These Radium Engineering fuel rails are compatible with the VR38DETT engine found in the Nissan R35 GT-R. To verify clearance, the dimensional drawings on the product pages can be used as a reference guide. Ample space around the fuel rail port(s) is necessary for larger accessories such as fuel pressure regulators, fuel pressure gauges, and fuel pulse dampers. The fuel rail ports are tapped for 8AN ORB.ĨAN ORB Adapter Fittings can be found HERE.ĨAN ORB Fuel Pulse Dampers can be found HERE.įuel Pressure Gauge Adapters can be found HERE.Īppropriate fittings must be selected based on the specific application.
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