jklinz

So ill start off with what i have in front of me. I went and bought a 91 rx7 and was told all i had left to do is put the harness on as it had a rebuilt 13b pulled from another for a lsx swap. Got the car back and waited for the next morning. Next day i popped the hood to find a s4 motor. I didnt notice cuz the intake was still off when i saw the car. Now my deal is that i have a s4 and s5 intake and ecus. A chopped s4 motor harness and possibly missing parts of the ignition harness. Im thinking ill use the s4 housing with s5 intake. All emissions are blocked off as is the omp. Which is no big deal as i was going to premix like i did with my other ones. So now im debating options. From what i read the intake mod isnt hard and i am more than capable of doing it. Im just looking for a little feedback on what to do with the harness situation and what ill need to wire. Or if i should just go with a s5 harness with s5 lim and uim with s5 tb. Another issue is the cas as i cant find the plug for it. The last option is sell my motor and tranny and go buy a s5 turbo swap as i already have alot of turbo parts including a good tranny from my last car.

86svo9l

Sounds like a familiar story. Did you buy the car from Iowa by chance? I sold the 13b 5speed combo out of my 87 to a guy who was going to drop it into a 91. I also happened to do an LS swap. I may be able to answer some questions about it if it is.

jklinz

Why yes i did. Got it from a kid in altoona. All the emissions removed and all. He had the motor in just no harness on it

86svo9l

Well a quick run down on the engine. My car had around 9x,xxx miles on it when I removed the engine. The engine had clearly been removed and torn down at some point, no idea when.

My original plan for the car was to LS swap it, but to run around on the rotary for a season. The rotary was such a disappointment and ran so poorly that I ended up buying all the LS stuff. While removing the rotary I discovered that whoever reinstalled the rotary before me had an issue with gaskets, as in they did not use any at all. There was so much silicone on every surface that the lower intake to housings were almost completely choked off, same thing for the upper to lower intake. Basically I had a bad taste in my mouth about the rotary because one of the previous owners was a rednech engineer. This explained why the car was under performing so badly and running rich. I toyed with the idea of tossing it back together and running it in good tune, but already had the LS stuff and pulled it. Compression checked out around 90-95psi. It was removed the fall of 2012.

All the fluids were good when I drained them. Trans had full synthetic in it and looked very fresh. There is a 6 puck clutch installed, it only had a few hundred miles on it or so the PO said. Trans shifted good when I drove it, no grinds. Engine did not over heat, or eat coolant the times I drove it(Had an aftermarket temp gauge). The car was already OMP and emissions delete when I got it.

When I sold the engine it came with everything I removed from the car. I had not cut the engine harness, it was complete from end to end. It was actually really easy to remove...

The injector clips were broken so I sent along new ones to make it easier on the guy buying it. Radiator was in poor shape. The only harness that did not go with the ECM was the one that ran to the gauge cluster, if there is something on that one you need let me know, I thought I would need it, but now know I do not. If you need that one I can send it over to you. I also sent an S5 turbo manifold along with it.

Also for the missing connectors if you can post pictures of what they look like I will look through the box of removed items and see if I have them.


Here is a picture of it when it was in my car. I wish I still had the pictures of my for sale ad.

jklinz

This defenetly helps out. Im glad you saw the thread haha. Anyway my issue right now is there is a big part of the harness cut between the two sets of injector tails. Almost all the clips are broke in one way or another, another clip cut up by the passenger headlight. The other issue is being a s5 dash harness it wont plug into the s4 ecu (obviously) but it i at least had the s4 plug i should beable to just repin the plug i would think. Ive done alotta swaps just they where all done on s13 and s14 240's. Where im pretty much at is finding a s5 harness and putting all the emissions **** back on. Only thing i really need is the electric port actuators. And yes i saw the silicone job on there. Taking the uim off was nearly impossible. It took my roomate and i to both pull on the bitch. Anyway ill go take pictures of what i have to deal with so it can give you a lil more insight on what all happened.

86svo9l

Yea. The injector clips were actually siliconed on when I got the car! So I had a bunch from a spare harness in my garage and cut them off and sent them along with. I am assuming they were planning on splicing the new ones on and had cut the harness to do so...

86svo9l

The intake stuff that you found must of been the guy I sold it to. I sold him the setup dissassembled down to the keg and trans essentially. Funny thing is I told him about the previous issue with all the silicone crap and apparently he did the same thing...

jklinz

This is the harness i have to work with. As you can see i had to open it up to see what i was dealing with since a bunch where cut. Mostly grounds it looks like. Most of the clips are broke.

RotaryEvolution

iTrader: (30)

if it were me i would install the parts from the S5 onto the engine, since the chassis will only really work with the S5 ECU anyways. disable the OMP with an Rtek chip and premix your fuel.

jklinz

Thats what i was thinking too. Only problem is i dont know whats what as everything is off the car. Im pretty sure most of this is s5 stuff besides the port actuators. But not sure. I kinda have a feeling this is gonna become a pain in the ***. But i think im gonna try and find a s5 harness and omp first or go rtek right away. Then try and find s5 port actuators. Then i guess just go from there is all i can really do

86svo9l

Looks like a rough position that is for sure. If you plan on giving the S4 harness a go let me know and i will get that stuff over to you.

That clutch is really sensitive as well. Major PITA to drive in normal conditions.

RotaryEvolution

iTrader: (30)

the S5 OMP won't bolt onto the S4 engine unless you change the front cover on the engine.

so the options become more limited to one route the more you put it on paper. wiring up an S4 ECU to work with an S5 car isn't something i have heard of or even seen, so i'm not even sure how feasable that is. the S4 intake system will also work, but i would choose the S5 first if you have everything for it, by everything i do mean everything..

jklinz

Yea eaither way i go with it seems like a nightmare. From what i read i could tear the entire dash harness from it and replace it with the s4 harness but then i would need a s4 cluster too if im correct. But the other side of that is god knows the problems id run into there. Im almost at a stalemate here. I think what i may do is just run bare essentials for the time being with the s5 harness and omp or rtek ecu. Hardest part is finding them. Couple harness on ebay but i hate ordering from there. Guess its time to start searching for parts. Yay.... And yea i can imagine the clutch lol i had a 6puck unsprung in my last 240. Real fun trying to drive in rush hour chicago traffic ha

jklinz

Well theres the other issue. I have a full s5 intake but as far as everything else goes i cant tell. I also have a s5 ecu and injectors. As far as the omp goes ive read just having it plugged in is all i need. Like i said i just plan on premixing anyway. I was just planning on plugging in the omp and securing it to the firewall or sumthing

RotaryEvolution

iTrader: (30)

you can leave it plugged in, i just hate the idea of having a big useless item flopping around under the hood that has no use besides keeping the car from going into limp mode.

a used S5 harness in the classifieds from a car that was running and pictures of it in usable condition would probably be your best bet.

jklinz

Thats what i was thinking too. I think im just gonna send my ecu to rtek and have it chipped and go with the s5 harness. My only question now really is: will the sensors on the s4 block work with the s5? They are on the drivers side in the back. And do the CAS interchange or will i need a s5? Thanks for the help this far guys. Ive had a couple fc's in the past but most i ever had to do was change a secondary injector.

RotaryEvolution

iTrader: (30)

the only thing on the block that won't directly interchange is the coolant temp sensor connection, you can cut off the S5 spade connector and install a bullet connector onto the harness and everything else will match up between the S5 harness and intake/S5 injectors. if you don't want to cut the harness then install a short jumper adapter wire from the spade connection to the bullet connection.

jklinz

Ok so i ordered a s5 harness and sent my ecu to rtek to be chipped. Hoping this will be the last thing i need to do. Now my issue is figuring out the vdi, actuators, and air pump. I would like at least the vdi to work for now till i can afford actuators. The entire assembly (sleeves, rods, actuator, etc.)is missing from the intake mani. So i have two holes as of now. The vdi is still there tho. Can i just make a couple block off plates for those?

86svo9l

I can help out with the rods and sleeves I think. Would have to find them. They were wired open on the car and everything had block off plates, one which was broken(Not sure what it is called, right on the outside middle of the lower intake). When toying with fixing it I actually picked up a new block off plate, which went with the engine, and removed the sleeves but forgot to send them along. They were literally wired open with bread ties. I was going to tap the guides and put in plugs. But from my understanding it is better to have them than to not.