GT1R Gen 2 Flex Fuel Kit, Stock Rails

Details

The second generation GT1R Flex Fuel kit is improved in both being completely plug and play to all year model R35 GTRs, as well as the sensor being relocated to the pressure side of the system.

The sensor on the pressure side of the system gives more consistent readings in the event that return fuel flow is minimal (if you’re nearly maxing out the fuel pumps).

We’ve also updated the wiring and now offer a plug and play wiring harness. Like the rest of our wire harnesses, we use Race Spec, the best in the business. Our harness is assembled using Mil Spec tefzel wire, Raychem DR-25 heat shrink, and new connectors for a durable and clean PNP installation.

The flex fuel converter box converts the digital signal from the ethanol sensor to a 0-5v signal that the stock ecu requires. With this converter, the output is .5v for 0% ethanol and 4.5v for 100% ethanol.

There is no display used with this kit, as both Cobb and EcuTek allow the user to view ethanol content in their own ways.

The complete kit includes all plumbing, with high quality Redhorse Performance ethanol compatible hose and crimp hose ends, the ethanol content sensor and mount, and the PNP wiring harness.

We offer kits to suit the stock fuel rail, or aftermarket rails. The stock fuel rail kit includes a rail adaptor to convert the rail inlet to AN threads. In addition, a V2 rail adapter which includes an 1/8 npt port for a pressure sensor is available in the dropdown menu below. If you’re using aftermarket rails, you will need to specify what size the rail is (6AN ORB or 8AN ORB).

$660.00

Details

Frequently Asked Questions About GT1R Gen 2 Flex Fuel Kit, Stock Rails

What improvements does the Gen 2 Flex Fuel Kit offer?

The Gen 2 kit features a completely plug-and-play wiring harness compatible with all model year R35 GT-Rs. Crucially, it relocates the ethanol sensor to the pressure side of the fuel system for superior accuracy.

Why is the sensor mounted on the pressure side?

Mounting the sensor on the pressure side ensures consistent readings even when return fuel flow is minimal. This is critical when you are pushing the fuel pumps to their limit and return flow drops.

Does this kit include a display gauge?

No. The kit is designed to integrate with the factory ECU via a converter box (0.5v to 4.5v signal). You view the ethanol content directly through your Cobb Accessport or EcuTek logging software.

What is the difference between the standard and V2 rail adapter?

The standard adapter converts the stock rail inlet to AN threads. The optional V2 adapter adds a 1/8 NPT port, allowing you to install a fuel pressure sensor directly at the rail without extra plumbing.

How is the wiring harness constructed?

The harness is built to professional 'Race Spec' standards using Mil-Spec Tefzel wire and Raychem DR-25 heat shrink protection, ensuring a durable, clean, and weather-resistant installation.