i swear ive seen this come up a couple times before, but i cant seem to find these threads anymore...

what i am doing, using NA s4 block, with a port matched s4 turbo manifolds and s4 turbo II electronics...s4 t2 ecu, afm, pressure sensor , ect

i dont plan to run a knock sensor ( not like it ever helped anyway...)

but i want to use the NA harnesses!!!

is it there anyone or a write up where this has been done before??
are the harnesses even remotly similar??

i know theres a few wires for alternator and temp gauge that must be changed, for sure. if using a turbo passenger harness and Na driver harnes but other hten that im unsure, which other items are in diff spots

i have emissions removal also.... only keeping the BAC, so less wires needed there.

 

looking at the pin out at the ECUs of an NA and t2 , it only says there are a few wires that dont match up...


pin 3D na=inhibiter,
turbo=fuel pump resist


pin: 2K na=split air
turbo=twinscroll


pin 1R na=p/s switch
turbo= knock unit


that cant really be all the wires that are diff is it??

 

no there must be more....Ive never got right down to it and compared like you are doing though.....

is your N/A harness S5 or S4?

 

If it is an s4 and you don't plan on running emmisions. All the essential stuff plugs in the same on a turbo, execpt the BAC, the TPS and the Alternator wires may need to be extended. Otherwise it is pretty straight forward, the few pin differences are not essential to the operation of the engine. So if emmissions are not a concern for you then it will be retardedly easy, otherwise it will take a bit more brain power, but nothing too difficult.


Trust me, i just did this for the first time, and the car runs like a champ.

 

There's no change to the alternator wires. I've no idea where you got that idea.

The inhibitor sw is for automatic cars. Ignore it.

I've written a dozen responses to how to use a n/a harness on a turbo engine.

You don't have a fuel pump resistor relay box so forget pin 3D. You might depin it though at the ECU.

Yes, a non turbo harness used on a turbo engine is almost plug and play. If using a twin scroll on the engine then extend the Split Air Solenoid connector to the twin scrolll solenoid. It's only a foot to a foot and a half distance.

Extend 2K to the Twin Scroll Solenoid IF you have one.

For get 2R since you don't need a knock sensor and don't have pwr steering anyway.

Yeah, I forget about the BAC plug having to be extended from the left of the engine to the right by about a foot and a half or so. That's why they make splices/butt connectors etc.

I pass emissions each year using the turbo engine in my 87n/a using the n/a harness. Piece of cake and all legal and above board.

Listen to Inbown5981. Don't use a turbo emissions harness with a n/a car/harness. It's a waste of time and money. Too many changes have to be made to the harness's for no good reason.

 

^^^^Thanks Hailers, I forgot about the alternator thing BTW, I am using an FD alternator so I had to extend the wiring. If you don't have an FD alt. just ignore that part.

 

ok thanks guys, ill post up how she runs hopefully by friday,