I am creating this thread to help others looking for info on wiring a 1jza80 motor into a Z. I have been researching for a few weeks for this swap. When it comes to experience, the most I've done is put an after-market radio into a car. At first it was a little daunting but after getting help from "frankdms" on SupraForums, i began to understand. In the past two days I have been able to get the motor running.
Feel free to critique what I've done and add your own info or ask questions.
My vehicle: 1978 Datsun 280z
My motor: 1jza80 w/ R154
To get the motor started and running, nothing else, you just need to worry about two plugs on the 1jz harness.
IH1
3- (RED & BLACK) switched +12V **** EFI
9- (GREY) switched +12V ***** IGSW signal from ignition
10- (BLACK w/BLUE STRIPE) ***** Starter signal
14- (BLACK) switched +12V ***** Ignition coils and injectors
EA2
1-(BLACK & YELLOW) constant +12V
2-(BLACK & ORANGE) switched ground
5-(BLACK & RED) switched +12V
You need to use a 4 lead relay. Since I'm not keeping the A/C, I reused the 280z A/C relay:
EA2#1 goes to 30 lead of the relay
EA2#2 goes to 86 lead of the relay
EA2#3 goes to 87 lead of the relay
Lead 85 of the relay goes to a ground.
That is all I have for now. I keep this thread updated as I go.