junito1

Ok. Basicly my S4 turbo wire harness is in horrible shape due to the previous owners. I have an s4 n/a parts car with a good looking harness. Could you swap them? whats the difference?

Do the people who convert their n/a to turbo swaps change the harness?

Icemark

There are a couple of wires you will need to extend and a couple extra wires you will have to run in, and a couple you need to de-pin and move at the ECU to use a Non Turbo harness with a stock Turbo motor and ECU.

HAILERS

There are three wire differences of which only ONE is significant.

1R is the knock input wire on the Turbo and is the P/S switch input on the na. I trust you have no PS so there's nothing to do here and the knock sensor is as close to usless as the Air Bypass Solenoid.

2K is the Split Air Solenoid on the na and is the Twin Scroll Solenoid on the Turbo.

3D is the auto trans Inhibitor switch on the n/a and is the Fuel Pump Resistor Relay on the Turbo. You don't have this RElay/Resistor outfit so nothing needs to be done here.

2K is the only one that needs attention. You would have to find the Split Air Solenoid plug, then run two wires from it to a solenoid. A *new* solenoid if you will. It will determine when the twin scroll actuator on the turbo itself opens and shuts. This means you have to run a vacuum line from that solenoid to the pipe on the twin scroll on the turbo. Big deal. You also have to run a source of vacuum to that solenoid. Big deal. There is a one way check valve that needs to be installed also. See the FSM for location of the check valve.

Actually you could locate that solenoid on the right fender if you wanted in order to keep the length of vacuum line shorter and the length of the two wires from the Split Air solenoid plug to a shorter length.

There is another wire that is insignificant. Pin 1C the Air Bypass relay on a na but is the Air Bypass Solenoid Relay on a turbo. The air bypass solenoid is located on the aft left side of a n/a but is on the top of the intake manifold on a turbo, so if you for some uknown reason wanted that to work you'd have to extend the wires from the aft left of the engine to the top right of the intake manifold. By the way, this valve only works on cold start and only for seventeen seconds. Not of any practical purpose known to man.

NEVER put a turbo EM harness on a series four na car. It is as close to being a known retard as you can ever get. It is dumb as a rock and, well ...stupid.

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junito1

Thanks for the info. Sounds a little complicated. I was never good with electronics/wiring

I think the best thing for me to do is to get a s4 turbo harness.

alwayssideways

I did this on a na- to turbo swap. I didnt have to extend anything. Mind you everything was removed from the car. p/s, emissions, the works. I didnt have to extend anything really. and the harness worked fine.

Mark

HAILERS

OH, GOD NO! That is suicide.

Sometbing you need to be aware of about harnesses: The wiring that attaches to the engine and connects to the fuel injectors is called the EM harness. EM stands for EMISSIONS harness.

That EM harness also mates not only to the ECU, but also mates with the F harness. F stands for FRONT harness.'

There are two fairly large plugs on the EM harness that mate with the F harness.

Now the problem is this. The pinout on the TURBO EM harness for those two plugs is NOT the same as the pinout for the NON TURBO EM harness.

This means what? It means you have to depin/re-pin those two plugs on the TURBO EM harness to match the wiring in the NON TURBO F harness. That's not that difficult but seeing as how you won't extend two wires and make a functional twin scroll solenoid, it's out of the question for you.

Trust me, that is a lot more complicated than what I described in my first post. I mean to say I was only talking about TWO SMALL 18 GAUGE WIRES.

I suggest you do what ALWAYSSIDEWAYS mentioned. Just do what he did. You'll not have a functional twin scroll actuator (it'll be wide open all the time, so no loss of boost involved, just a slightly slower spoolup).

Yeah. So what he did. DO NOT WHATEVER YOU DO install a turbo EM harness on the non turbo car or you will be looking for lessons in repinning plugs and reading the wiring schematics plus the FUEL section of the FSM.

What I just wrote does NOT apply to S5 cars and harnesses, only series four.

tandolla

iTrader: (1)

*NOTE* i did not read any of the posts.*

yes it is possible, i used my NA harness for my TII swap and i didnt not have to extend any wires besides for the Twinscroll, the only reason why i did sextend some wires. was becuase they were barly reaching.. so i extended just to be safe... also note that i removed all my emissions.

'87 turbo II

iTrader: (1)

he wants to use a Turbo harness on a turbo car...... how is that suicide again?

HAILERS

****he wants to use a Turbo harness on a turbo car...... how is that suicide again*******8

Because I dumbed out and didn't read/realize that he has a turbo car?? Yes

junito1

Ok, I had already swaped out my s4 turbo for an s5 turbo/manifold. SO it makes it that much easier?

junito1

ok. you guys kinda confused me.

I have ac and ps and clutch fan still on. s4 twinscroll flap replaced for s5 turbo/mani. Oh and my emissions are removed.

So all i need it to mess with a few wires?

HAILERS

[No. Don't do it. Too many wires to be rearranged at the plugs on the EM harness that mate with the F harness. Sorry about the confusion.

Phantomkid

alright this has me alittle confused now so if your running the t2 EM harness and the rest NA harnesses you have to depin stuff so that the t2 EM harness works with the na front harness? im pretty much just looking to use the na harness's all together but i was just wondering cause right now im using the turbo em with all the rest na and im missing some stuff and some gauges arnt working could the problem be the wiring from the t2 to the na front?