VG30DE(TT) and RBxxDE(TT) Wiring guide
The goal of this document is to give basic information on the wiring of a DOHC VG or RB into a Z31. This is not a full write-up. It is assumed you have basic understanding of automotive wiring. I can not be held responsible for any damage done to your vehicle.
*WARNING* - Do this modification at your own risk. We Are not responsable for any issues of your own doing.
General DE Wiring Diagram
Below you will find a general guide for the minimal required wiring changes needed to install a Nissan DOHC motor into your Z31. This includes the following engines:
- VG30DE
- VG30DET
- VG30DETT
- RB20DET
- RB25DETT
- RB25DE
- RB26DETT
Z32 EFI HARNESS CONNECTOR IDENTIFICATION
The following connector pinouts are for the Z32 connectors.
Essential Z31 Wiring
This is the minimal wiring needed to connect to the Z31 body harness.
Below are connector diagrams with the wires labeled for their purpose using the wire colors as described above. These are the only wires you'll need for the body harness connection. This is the EFI harness side connector view.
Tachometer Wiring With DE Motors
To get the tachometer to function with a DOHC VG or RB, you must splice the pin 3 coil wires (black, grounded) together for all 6 cylinders (as is OE), but rather than grounding them to the engine as OE wiring – run them to the blue Z31 tachometer wire.
Sources Used
- 1984-1988 Nissan 300ZX Factory Service Manual
- Boost Control Diagram Picture from: Bob Sharp Z Car Club