I bought a 86 RX-7 GXL about a month ago. Last week, I picked up a turbo II engine and transmission from the J.Y. and I want to know what I need to run this engine in my RX-7.

-Do I have to change the wiring harness coming from the dash to the ECU?
-As far as ECU/MAF/Boost solenoid, does all the number have to match? For example: N374 ECU, N370 MAF, N370 boost solenoid.
-Will the S5 TII engine harness plug into the S4 plugs that are under the dash?
-Does the N/A CAS work with the TII ECU?

Sorry for all the noob questions, I pulled this engine out of a N/A RX-7 and it was a mess of wires and random crap. Seems like they were trying to make it run on the N/A ECU. The wiring harness was a hybrid of TII-N/A and the ECU was N/A.

 

I know that the harness will not match up i believe in the archives you can find the corresponding s4 to s5 T2 wiring diagrams .Im in the same process you are in bud,Im actually looking to purchase a new harness that just is all plug and play and with new solenoids etc.just wanna make sure that i dont half *** anything rather place new or like new parts in the car and that it will run right.Take a look in the second gen archive section .Use the search option just make sure you are specific in what you are looking for then it should bring up the info you need .Let me know if you need anything or have questions as we are both doing the same thing to our vehicles maybe we can trade info on the subject.Good luck to you.and yes you have to get the same ecu airflow meter and boost solenoid i believe .

 

No, the harnesses will not mate. s4 and s5 use totally different wiring connectors. So, there are 3 routes you can go:

1) try to re-pin the s5 wiring harness wires into s4 connectors and make things work that way. this is a tedious method but also probably the cheapest.

2) swap the wiring in the car to match the s5 engine harness, using the rest of the wiring from the s5 junkyard car

3) swap the engine harness to match the s4 car's wiring, using an s4 turbo engine harness that you buy seperately

 

It would be easier if you got everything for an S5 turbo2 and swapped it into the car. You will need a turbo2 trans to n/a rearend driveshaft, either get one made or buy the mazdatrix one.

 

Ok, lets say that I'm going to use a modified N/A S4 engine harness, that means that I would use an S4 turbo 2 ECU, VAF, and boost solenoid? Also what am I going to do on the S5 turbo 2 engine to run the electric OMP? Can the S4 computer be able to run it? Or do I grab the S4 mechanical OMP and S4 turbo 2 throttle body?

Does the S5 ECU have a different plugs into the ECU? If so which ones? What I'm trying to find out is if I can use the S5 ECU to connect to the chassis harness, that way I can run the electric OMP.

Yes I found out that I do need a custom drive shaft to mate the turbo 2 transmission and the GXL rear end.

 

Go haltech ecu

 

^ I would if I had the cash. Could any stand alone control the electric OMP? I have a MS I V3.0 from me MX-3 that I could modified to work with the RX-7 engine

 

If you don't have the funds right now, wait and save up bro. Doing it the "cheap" way now will cost you way more in the end.

 

All the plugs to the ECU are different from an S4 to an S5. You can run the s4 n/a harness but you should go with a standalone ECU if you are doing that. If you try to use s4 turbo2 ecu with an s4 n/a harness and an s5 turbo2 engine you are bound for problems like limp mode since the OMP are completely different. You can swap a s4 OMP onto the s5 engine or you can delete the OMP and run premix.

 

Dude, use the S4 mechanical MOP. (Metering Oil Pump) - It's not that complicated.

Here's some good information:

Rotary Resurrection: S5 engine swap into a S4 car

 

It isnt that complicated at all its a matter of swapping the OMP over and doing some small fabbing BUT to people that dont know Rx-7s all that well every input helps. On top of the link you just posted theres about 100 threads or more all over the site that cover a na to turbo2 swap with a ton of stuff you would want to know.

 

Very true. I forgot I was in the "New Member Rx-7 Technical" section. Which is no big deal... We were all new once.

OP, the reason I advise using the S4 MOP... Is because the S5 MOP can run into plenty of electrical issues, and premixing is just another thing to remember to do at the gas station. The only thing to be sure of with either the S4 or S5 MOP's, is to have good quality MOP lines. The 20+ year old lines are bound to crack and break. Which will cause some issues.

Check these out, though... Karack's stainless braided MOP lines <- Those are quality.

 

Yea those lines are nice I plan to buy a set when i turbo2 swap my vert

 

How simple you make it is on you if you delete all the emissions, remove the OIL METERING PUMP, sorry the mop is driving me crazy say it right if your going to say lol. But if you don't have a block off plate for the tIme being you can thread a general 12mm short bolt into where the lines went I actually had to do this until I got my plate off my other engine just use thread locker, this is Only a temp from point a to b fix and not recommended for a long period of time, it is easier to fix it right the first time, but if you delete the emissions and only keep what is needed you can rewire your harness pretty easy if you know how to read a wiring diagram I can probably get pics of my harness and maybe a detail description of what is what

 

That would be great!

 

Ok I do all this from my phone if you wanna text me or email me just let me know, I cant upload the pics from my phone

 

If you're looking to make comments like this... Then you better get your **** straight. It IS Metering Oil Pump (MOP). Ever read the FSM?

Here you go:
FSM: S4 Lubrication System

FSM: S5 Lubrication System

 

I'm sorry bro. I just looked at the fsm at my house and sure enough you are correct, but most people refer to it as the oil metering pump. Next time before I bust another person out I will double check my books first

 

I know... Not trying to be a dick. It's all good.

 

Hi guys, i'm in same process. I think that all you need is: TII Engine with cables and ecu, transmition, lsd and dashboard.
If you mount all this form the same car will be pug & play.

so, it's just my opinion, i don't know it at 100%.

 

I will be running MS3X and home made chassis harness (easier for me to do). Do I have to mod the MS3X to run the 13BT? I'm making my own harness.

 

The guy that runs rotary resurrection is a very good guy. I have always gone to him for any help that i needed.. (helps he lives like 30 minutes from me) Sorry to bust your thread.

 

Kevin Landers. Great guy... He built my engine.

 

In regards to this, s4 and s5 cas the same?

 

No the CAS's arent the same and OMP, MOP ... they mean the same thing doesnt really matter because either way the person reading gets the point.