Project Nissan Skyline R33 GT-R – Part 5: New Fuel System by Radium, DeatschWerks, and AEM!
Rolling into Modified by KC with our fuel components from Radium Engineering, DeatschWerks, and AEM.

Upon Modified by KC‘s installation of the the Borg Warner 8374 turbo, Rull Race manifold, and custom fabricated our Vibrant Performance exhaust system, it was time for dyno tuning. Unfortunately, it wasn’t until then that we realized we were limited in fuel. At 95% duty cycle from the injectors, MKC tuner Chad Charlton decided that we were either running out of injector, or fuel pump, or both, due to the what also was a drop in fuel pressure at the top end of the curve.

Given the age of the car, we made the simple decision to replace the whole fuel system, including the lines. With an older car, the last thing I want is something going wrong with the fuel. In fact, I already had noticed that every time the car was cold started, if I shut if off right away it wouldn’t start again because the injectors would flood the engine and, as a result, the car would have to sit for an hour before restarting. The only way around this was to keep the car running for several minutes after a cold start. I suspected leaky injectors. With the new system, this should be a thing of the past. Okay, let’s get on with it.

This is Radium Engineering’s “Late model Nissan” fuel pump hanger, which replaces the entire factory fuel pump hanger assembly inside the fuel tank. It can be configured with 1 or 2 aftermarket fuel pumps to meet the fuel demands of various power levels.
DeatschWerks is one of the few companies offering injectors for the RB26DETT engine. We chose to run its E85-compliant 1200cc units, which they converted from low impedence to high impedence for us. The rated flow is good for up to 600 WHP on E85 (nearly 800 WHP on gasoline) at just 80% duty cycle. That’s more than enough for my power goals on this stock RB26DETT engine.
Radium Engineering’s RB26DETT E85-compliant fuel rail kit is designed specifically for OEM R32/R33/R34 RB26DETT intake manifolds, and will be the home for our DW 1200cc injectors. Manufactured with a large 0.69″ internal bore, the fuel rail can support all necessary engine power requirements. The rail is CNC machined from a custom 6063 aluminum extrusion and black anodized and laser etched for a high quality surface finish. For thermal insulation, Radium press-fit machined phenolic spacers and washers to completely isolate the fuel rail from heat transfer via the manifold and mounting bolts. In my quest to black out the engine bay little by little, I went with the obvious black anodized option. Radium also offers this in its signature green color.
Twin AEM 340 LPH fuel pumps will take their new places on the Radium fuel hanger. Each pump is tested to 340 liters per hour before it is packaged. That’s enough to support up to 1000hp in gas engines, according to AEM. We chose these pumps because they’re not only compatible with our fuel hanger and highly reliable, but also E85 compliant (p/n 50-1215). Each kit includes a fuel pump, rubber sleeve and end caps, pre filter, hose, clamps and flying lead. With these fuel pumps installed, the car is incredibly quiet upon start up, as opposed to before. Since we’ll be running primarily E85 fuel, MKC thought it would be best to error on the safer side of two pumps instead of one, which will leave us a lot of room in the horsepower department.

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