need info. installing fuel inj. in 240z

[1 tuff z]

i'd also look to swap in a 74.5-76 fi fuel baffled fuel tank. hate to have your newly fi'd z fuel starve, get some air into the lines and lean out, possibly cooking the engine. the above listed tank will fit perfectly into the 240z's. most of the v8 swap guys are doing the same thing to avoid engine damage.

[san_maru_zed]

i'd also look to swap in a 74.5-76 fi fuel baffled fuel tank. hate to have your newly fi'd z fuel starve, get some air into the lines and lean out, possibly cooking the engine. the above listed tank will fit perfectly into the 240z's. most of the v8 swap guys are doing the same thing to avoid engine damage.

Unfortunately we never received the above model in australia, so will be using external surge tanks and hi pressure pump

[HKSZ]

Unfortunatly the project hasn't progressed any since fitting the motor 4 months ago!!!

Let us know how you go with the wiring, I've got all the bits from the donar car as well as having a second running 280zx so I should be able to sus it out without needing an auto elec

[san_maru_zed]

Ok, all the manifold are on, and someof the wiring is done.

Stuck on a couple of things....first of all, which injector leads go to which injector :cross-eye Anyone have a wire color/injector cross reference ?

My biggest concern is that I can't find the fuel injection relay which is prevalent in the 280z 'EFI bible'. I've been looking in 280ZX's for it and cant find it at all. Does anyone have a picture or something ?

Here are a couple of pics, First one is where Im at, second one shows wiring which is supposed to hok up inside the car...I've got no idea what to though !

The L28 engine was ripped out of an R30 skyline (previous owner had replaced the L24), so Im not even sure if I have the L24E harness, or the L28 harness.

[HKSZ]

I'll check my loom tomorrow as I pulled it all without having to make too many cuts.

On the injector loom I did find numbers when I pulled back the sheaths, But that said I've been told that it doesn't matter as they all fire at once.

Did you get the L28 brain?

[ecp48]

san_maru_zed,

What you are up against are the differences between years of fuel injected Zs and 850/maximas. As to the Zs, the 75 - 77 280 is very similar. the fuel injection relay, (single relay) is located in the left side kick panel, at a height which places it behind the dash.

The 1978 280Z has an interim injection system. Three relays, all located under the black relay bracket, in front of the battery on the passenger side fender well. It is quite similar in function to a ZX.

The 280ZX also has multiple relays, but they are not all in the same place (from memory). I think one is on the right or passenger side fender wall in a recess in front of the battery and two others are on the drivers fender wall toward the front.

The 850 Sedan system is quite similar to the 75 - 77 280, (I used an 850 CPU in my 75 280 years ago). The maxima is close to the ZX, but I can't recall the relay locations.

In essense the the 78 280Z was a change over system, moving toward the ZX system, which had the 02 Sensor and other bells and whistles.

You must look for the relays, which match the harness (year and donor car) you are installing.

Good luck.

ecp48/Ed Palmer

Athens, GA

[san_maru_zed]

ecp48, thanks for that, my wiring should be a post 79 (no fi system sold here prior to that). Will have to take another closer look at the loom. from what I recall though, there was one relay on the loom, and no plugs for any more relays in the engine bay....

HKSZ, cheers, I will just hook em up any which way I can then. AFAIK it is an L28 ECU

[ecp48]

san_maru_zed

Based totally on hearsay (Lawyer term), when I was trying to figure out what I had after acquiring the 78 (I had a 76 and had previously owned a 75), a local tech told me that the 78 harness was used for only part of one year here, but was used until early 80 in OZ. If so, the harness would have 3 pigtails for a four pin relay on the passenger fenderwall. The relays mount behind the black bracket (large L shaped) in front of the battery. Two are the small (appx 1 - 1.25" square) base, one the 1 X 2 base. The latter may have five pins, I can't remember and my schematic is not at hand.

By the way, the fuel injection relay on the 75 - 77 was on a pigtail off of the FI wire loom near the ECU connector.

If you think of any other questions feel free to email.

Ed Palmer/ecp48

Athens, Ga

[HKSZ]

Here's a pic of my S1 280zx fi loom.

A rough idea of wires from ECU plug

single spade. -ve coil

3 spade. acc on ignition

+ve fuel pump

-ve fuel pump

2 spade. both +ve battery terminal

brown relay came from compartment near battery LHS

2 connectors go to 2 silver packs which control first 3 injector and last 3 injectors

flat black connector goes to airmeter

This is all just an educated guess at the moment, I haven't fired mine up yet!

[san_maru_zed]

Im no expert but it sounds very plausible. I grabbed the brown relay from in front of the battery just in case I needed it. Don't seem to have a place to connect it to though....

My AFM wires have been cut from the main loom so no idea where they are gonna wire into :-S

I've got the worst feeling that I am either going to have to get schematics for my ECU (anyway to tell which series the ECU it is?) from somewhere and check/rewire the thing, or pull another loom from a comeplete car. I really want to have this thing up and running within a few weeks and as I only have weekends to do it Im gonna have to pull my socks up.

I will have a better idea after this weekend though, so I wont panic until after then.

[san_maru_zed]

I have gotten my hands on a couple of different 280z wiring schematics (US), and an R30 L24E skyline schematic. My ECU and harness seems a lot more similar to the L24E one, the main difference being that all the wire colours are different and other minor differences. Definately not similar to any L28E I have seen both in person nor in wiring diagram.

Anyway, the two main components I was missing was the EFI relay, and the fuel pump relay. These are both 4 pin relays. I have wired them into the loom and all that is left to do is hook up a couple of wires to the ignition,fuel pump and some earths.

On another note, I have modified my std fuel pump bracket to accomodate a High pressure pump and a surge tank. Not sure if I will try cramming it all on the one side or if I will mount the surge and high pressure pump on either sides of the bracket. The photo has the std lift pump and the high pressure pump. Im yet to get my hands on the surge tank, but would like to keep it to around 600ml for size reasons (would this be big enough?).

[ecp48]

san_maru_zed,

They look like the 78 280 type relays. When I get home from OHIO (Athens, GA), I will try to scan a copy for you.

Ed Palmer