i am swapping in a stock 87 turbo II engine into my 1963 nova and have a complete doner car, i have taken the entire engine harness and ecm, heres the question on the drivers side i also have a harness hooked into the second set of coils. and into everything else! is their any other way to get the second set hooked up without all the factory harness? would like a clean looking set up without all the factory wiring mess.

 

look at a wiring harness schematic.

 

That harness is called the "engine" harness in the service manuals. The other harness with the fuel injectors is called the "emissions" harness btw. It's a little confusing because when people on rx7club talk about the engine harness they usually mean the emissions harness. The "front" harness is the really big one that goes to the dash.

You need to be careful if you start cutting up these harnesses because of the shielding to prevent electrical noise. Otherwise you could have crank angle sensor problems which could even result in a no-start situation.

The wiring diagrams are in the FAQ of the 2nd generation technical section in this forum.

 

ok so i have the emmisions harness from the passenger side out complete with the computer box it hooks to complete without cutting anything up, and on the harness on the engine that hooks up the trans as well also came out complete with the engine, so do i also need the harness that goes back into the fire wall on the drivers side? i no it hooks to a set of coils but the rest of it looks like its for lights and stuff. can i just use parts of that one or do i need it all out off the car as well?

 

if you had downloaded the wiring harness pdf and looked at it, you would know the answer aleady, and surely you don't think you're going to get by without it?

most people that do 13b swaps go carb'd, and the wiring is the biggest reason why...

 

I would highly recommend for you to go carb. If you have teh funds, look around for like the Webber or ole school Dellorto sidedrafts. They are better and it would bring a ole'school rotary vibe to your already ole school car. Jus sayin'.

 

Your best bet might be to look for an aftermarket ECU, something like a microtech LT8, basic bare-bones computer, with an already built harness. That way you will have only the wiring that you need for the engine, you can ditch all your emissions crap, and have a much cleaner harness.

I'm not sure what all is involved in getting the stock ECU to work in another vehicle, if you need other parts from the stock chassis, or body harness, but I would personally look at an aftermarket ECU, and then get it tuned by a professional. You're going to need all the ponies you can get to move that big pig anyways!

 

Start looking at page 100 of the s4 wiring diagram pdf (also labeled as page 50-112). Also see pages 19 and 22 of the PDF.

It sounds like you've already pulled the Emissions harness and the Engine harness, and you are wondering whether you need the Front harness or not. Well here's how it works...

EM harness --> ECU , but also connects to F harness for fuel pump trigger and body related stuff (wipers, cruise control)

E harness --> F harness --> ECU

For the fuel pump, EM harness --> F harness --> Circuit opening relay --> R harness --> fuel pump . There's also a two-speed fuel pump resistor thing in-line but you want to ditch that.

For the starter, E harness --> F harness

It would be easiest to run custom fuel pump and starter wiring, probably to your factory ignition switch on the 'Nova or with toggle switches. But be advised that the factory wiring has a clutch interlock switch for the starter and an airflow meter trigger for the fuel pump in case there is an accident.


Emissions harness

This connects to all the stuff for the two smaller ECU plugs plus has a few other random things. From left to right the ECU plugs are large, medium, and small. The emissions harness has all the stuff for the medium and the small plugs, plus it has two big orange connectors which go the the Front harness. One of those wires on the FEM-02 connector is a brown switched ground wire from the airflow meter to the circuit opening relay (the term used in the manual for the fuel pump relay). That's used to keep the fuel pump running after the key leaves the "START" position.

Engine Harness

This has the crank angle sensor wires as well as alternator wires, plus wires to the transmission. It connects to the Front harness and also has the main relay.

Front Harness

Besides having the wires for the coilpacks, it is a junction harness that connects to all the other major harnesses in the car. If you plan to run a factory ECU or chipped ECU (Rtek) you will need to retain this harness but it can be significantly cut down. Just make sure you don't go cutting wires for the main relay, crank angle sensor, ignition coils, etc. You'll probably want to unwrap this harness and find all the wires you need to keep, then cut everything else. Otherwise, don't cut the F harness at all (if you're worried about making a mistake) but just leave a lot of empty plugs. Use zipties to keep it as neat as you can. You could clean it all up later when you're sure the car runs.

 

ARGHX thanks for all the great information it has realy helped, as for Trots smart *** coment about my car being a big pig well it has a curb weight of 2700 lbs with a V8 so which is heavier my nova or the second gen? well i guess we know that to dont we.

 

I hope you have compression tested this engine and you are sure it is healthy. Also, look into the Rtek 2.1 for engine management (see Rtek section on this forum) and look into porting the wastegate to keep the boost from reaching unsafe levels on the factory turbo.

 

will look into the wastegate portin, and the doner car was a running car so i drove it and it sem to run strong.

 

finaly had time today to get the mounts fabed up and get the motor in the car. what a mission! the motor with turbo barely squeezed between the shoch towers. might be a problem if i ever upgrade the turbo and exhaust manifold. mwould have to be custom made as well. but it looks like its all gonna workout great. cant beleive a 400 chevy fit in the same car no problem.

 

what rear end are you using?

 

im using the factory GM ten bolt. posi 410 gears.