I am swapping my S5 TII into my S4 N/A car. I don't want to swap over all of the electronics and OMP and all that crap, I would really like to keep my engine together as a S5. If I swapped over all the S4 stuff it would have defeated the purpose of gettin a S5 right? So here's what I have:

S5 TII Engine & Drivetrain
S5 Harness
S5 MAF Sensor
S5 MAP(Boost) Sensor
S5 ECU

With all this stuff, It should be a smooth swap...right? Or not...

The harness on the Pass side will be no prob, pull it through the firewall and plug it in...but the driver side could be a problem. Will all the little white plugs under the Master Cyl plug in right or will I have to do some cutting and splicing?

 

Basically...youre gonna have to take out the dash....and every last bit of wiring in your car to do the swap easily. They changed EVERYTHING in s5 as far as wiring. If you start cutting and splicing....you better know both wiring setups inside and out. Its one thing to swap in a s5 guage cluster....or other small things...but to do the whole thing....eyechh. Anyways..good luck

 

All this depends on how mechanicallly inclined you are.

If you want the easiest route you should just get the s4 parts: maf sensor, boost sensor, s4 ecu, and the s4 harness as well. In exchange you could just sell your s5 parts and plus s4 parts are easier to find, more abundant, and most of the time cheaper. I tell you this is the easiest because from this step all you would have to worry about now would simply be your oil injection meaning your Oil metering pump.

I simply blocked mine off and run premix. On the other hand u could just swap front covers to run mechanical system. I decided to block mine off and run premix since my old motor had a failing OMP and didn't feel like swappin front covers either.

Going the other route (your way) would consist of taking down the dash and pretty much converting THE ENTIRE SYSTEM TO s5 model type (a lot of work!!). If you don't do this, your s5 ecu wouldn't even make the OMP system work since its electronical. I believe if you try to rig it the OMP system will go into limp mode. So if you want the electric OMP to work you would need to do the dash conversion which i think its pointless work.

 

I'll definitely PM you on how mine was done...but no electrical problems or anything of the such and my OMP is removed is well...running straight Idemitsu Premix.

 

That's if you use a S4 ecu, or find a modified s5 ecu (if they even exist)

 

ok, so if i was to swap over the s4 stuff to my s5 block, what parts, exactly, would i use off of the s4...keep in mind that my s4 motor is a n/a...another potential problem

 

Will s4 n/a efi stuff work on a s5 motor? will i be using my s4 n/a parts at all? i know the harness will work, but i have to get s4 t2 ecu, maf and boost sens, is this all i need, just plug it all in and im done right?

 

another question...will all my s5 sensors work with the s4 harness and ecu or will i have to swap them tooo?

 

Easiest way is to just run a standalone, sorry.

 

thank you for telling my what about 152 other plople have said, but obviously i dont want to run a standalone, so forget it, if your not gonna help, dont post

 

You'll need to use a S4 ECU and a s4 harness, and you'll have to swap injectors and or swap connectors, and most other sensors, so basically you'll have to rig up the TPS, remove the OMP and run premix, swap injectors, use a s4 alt, or rig up the s5. Should've just stayed within series.

 

Uhm, ok, don't get your panties in a twist. By the way, those 152 other people are right.

 

dag is the only one in this thread that gave you any good advice.

Ignore everyone in this thread who just told you that you need to rip apart the dash and go completely S5, or those that told you that you need to go S4. That's just plain bad advice. Making a hybrid system is just going to take some soldering, and some time with the factory service manuals for both series.

With some planning, you should be able to do the modifications in a day, plus troubleshooting time. My advice to you would be to take a look at the Emissions Section of the S5 FSM, and have a look at the pin-outs. The parts I'd be looking at if I were you are the: the battery connection, main relay control, the ignition switch, leading and trailing coils, and fuel pump resistor relay (depending on how your fuel pumps are setup).

 

Well i know i have a s5 block in my 86 but I am unsure about the manifold ect and the ecu. im gonna check the ecu tomorrow. All i know for sure is the front plate had to be changed.

 

I am in the process of putting a S5 T2 motor in my S4, I thought I had it all worked out, the wiring that is, but after reading this thread I'm a bit worried. I am running all S5 gear such as ecu and loom, afm, gearbox. I am not running any p/s or a/c or any emissions.

I though everything was going to be sweet but had a funny idea about where does the power from the ecu come from?

 

Rotory Ressurection has a great write up on this .

 

ok...i think i figuered it all out, and i'm gonna try it and hope it runs...i am gonna keep my s5tII complete, but i will swap out all the sensors for the s4 sensors, s4 harness, s4 ecu......it sounds good on paper, but the question is........will it work? we'll find out soon enough

 

Anyone got my back on this one? ^

 

ok, new info...I work at a local auto parts store, and according to TWO DIFFERENT COMPANIES, all the sensors are the same between S4 N/A and S5 TII, except the MAF, Boost and TPS. The temp sending unit also has to be swapped out...but all the engine sensors are the same between the two motors...can anyone contradict this?

 

dont forget to use s4 tii injectors, there low impedance, your s5's are high.
i know how you feel about the whole swap, im having to do the exact same thing, i just baught a s5 tii to go in my s4 tii and just thought i could change the right side wireing harness and ecu. not everthing on the motor./

 

Well i have Greddy Universal 720cc injectors........are those low or high impedance?

 

i thoubht it would b ez 2 ,but now im runnin into problems. got a 89 with a s4 t2 motor and im going to change the chassis harness that plugs into the cpu. it looks like alot of work. check out I LUVMYRX7.COM . they have lots of info. good luck, ill check back 2 see what u come up with or 2 let u know what i find out.

 

ok...new update...i got the engine all torn down to basically the short block. I am using the S5 engine, manifolds, turbos and all that stuff.....i'm using the ecu, maf, boost sensor from the s4 TII.......but the problem is that most of the plugs don't like up.the bac valve is different and also the tps situation is all confusing. would i be better off using a s4 tII harness on my s5 engine or stick with my s4 na harness. or another idea was to get a s5 t2 harness to use with my s4 efi ****........someone help me!!!!!!!!!!

 

from a bare short block, use your old s4 manifolds, and waterpump, water pump might need a little lining up. Also use the s4 front cover, but watch the font cover o ring, the s5 motor is higher oil pressure, thats why there is the ring around the o ring. If you have them, use the old s4 injectors and all sensors. That way you can use the same ecu and wiring harness that are already in the car. You basically are making an s5 in s4 clothes.

 

Ok. Heres what you need to do. Ideally, you would want to use s4 lower intake and upper intake and anything involved with that (bac, iacv, etc...), s4 injectors. Basically the only thing s5 that you wanna retain, is the short block, turbo, and exhaust manifold. You would also want to change the front cover from s5 turbo to s4 turbo, otherwise block the omp off. You would also need s4 tII wiring harness, and computer. Try to keep the years together on the parts you get. If you get an 87 turbo ecu, use 87 harness and injectors. 87 injectors are low impedence, 88 and up are high impedence. This is what you are going to need to to, unless you have shop manuals for both s4 and s5. Then youre gonna need to understand wiring diagrams.


basically what ive told you is the easiest way, besides using standalone