LPFS integration for Z4 35i & 35is (N54)

[Darke Peak]

For those that would like to integrate the Low Pressure Fuel Sensor (LPFS) from the 135/335 into their Z4 35i/s I made this tutorial video. The video covers the mechanical and electrical aspects but you will need to consult a tuner for the firmware integration. I’m currently using it in monitoring mode but I have seen it work in closed loop control mode also. Thanks to @carabuser & Ken @WedgePerformance for their assistance. I’ve also got Reflex+ (for PI control) with the optional fuel pressure sensor so this modification is redundant in my case, unless I change to closed loop control.

 

[TOR COILS]

whats u lpfp？walbro 535？or stock

 

[Darke Peak]

whats u lpfp？walbro 535？or stock

Walbro 535 (with aftermarket external check valve and 10um in line filter).

 

[TOR COILS]

535lpfp Do you need reverse wiring? Red + corresponding car black-?
the wires on the new pump needed to be reversed =opposite like was in pictures in this thread.

 

[Darke Peak]

535lpfp Do you need reverse wiring? Red + corresponding car black-?
the wires on the new pump needed to be reversed =opposite like was in pictures in this thread.

Here was my video on the topic

 

[TOR COILS]

Here was my video on the topic

Why is everyone in reverse? Is there a correct answer? Thank you

 

[Darke Peak]

Why is everyone in reverse? Is there a correct answer? Thank you

Red connects to brown.
White connects to black.

I think you are confused about normal wiring colour protocols.

Red and brown are common positive wire colours.

Black and white are common negative wire colours.

 

[TOR COILS]

Red connects to brown.
White connects to black.

I think you are confused about normal wiring colour protocols.

Red and brown are common positive wire colours.

Black and white are common negative wire colours.

So I'm curious that so many people are connected, red connects to black, and they all run great.