i am planning on swapping my 86 na 13b to a s5 13bt and was wondering if getting a turbo 2 engine with a 5 speed tranny and a t2 ecu and electrical harness for 1500 if it will be an easy swap or what would be involved on doing so. im thinking i may need a new fuel pump and a custom driveshaft and then i would be fine and ready to go. my main thing is how the wiring harness will go in, do i have to pull my entire old one or can i splice it in somehow? thanks

 

You definately will have to pull the harness and swap in the new one.

The S5 t2 has numerous upgrades from the S4 t2, most notable it's higher compression and lighter rotors. However, the s4 changed from a mechanical omp to the s5 electronic omp. I'd rather have a mechanical omp all day. So, take your time to inspect and build the engine to your taste before you throw it in.

 

The easiest way would be to use all your S4 electronics. Merging an S5 harness with an S4 car isn't straightforward. It's not impossible, it's just not straightforward.

You can use the S4 NA harness with the S4 TII ECU with only a few minor changes. You'll need the TII AFM as well as TII pressure sensor.

 

But what about the electronic omp his new engine would have?!

 

Front cover would need to be used from a s4 TII to convert to mechanical OMP, or just block off the s5 OMP and premix.

 

Exactly. Which he doesn't have. Might be easier to buy an s4 t2 for his situation, no? Or swap in the s5 wiring.

I'd personally swap it like you said. Build it before I put it in.

 

well at this point should i try to find a s4 13bt? that way the harness would be easier to deal with, i mean it either this or a na turbo conversion witch many are saying may end up badly... so in effort to dodge this i wanted to swap a t2 in, sell my na engine witch only has maybe 10k miles on it. and make some of my money back from buying the t2 engine. so in any aspect it would be rather easier to swap the s4 not the s5?

 

It is ALWAYS much easier to stay within series. You can use an S5 turbocharger to get the most important benefit of the S5 engine. Read the thread in my signature to learn all you'll need to know to make the swap easy.

 

ok few more questions, if i get a jdm turbo 2 engine will the fuel lines needs relocated? and also will the transmission the would come mated to it be set up as such for right hand driver? and also i should use the stock ecu that would come with the engine? and ditch the harness or sell it ? i dont need it?(it comes with it as well).. thanks

 

Faced with the choice of rewiring the electronics to work or buying a used S4 TII front cover off of eBay, I'd go with the eBay.

Then again I would have started with a standalone, so....

J-spec engines are exactly the same as those sold in North America save for a few emissions differences. As are the transmissions, etc.

 

Fuel feed/return line are swapped with a j-spec. The transmission shift pattern is exactly the same.

For the ECU, get an N332 or N333 (US ECUs). I don't know if the S4 Japanese ECU will even work.

 

so if i bought an engine from over seas it would need a american ecu? not japanese? and could i use my stock ecu? so other than those few set backs it would be as simple as bolting it in? can i just swing in the engine and the tranny as one or do they need divided?

 

You can use your stock TII ECU