S4 N/A to S5 TII engine swap questions
01-04-12, 05:54 PM
#1
S4 N/A to S5 TII engine swap questions
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.
-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.
01-04-12, 09:26 PM
#2
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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 .
01-06-12, 12:24 PM
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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
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
01-06-12, 12:45 PM
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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.
01-07-12, 11:08 AM
#5
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.
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.
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01-07-12, 07:44 PM
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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.
01-08-12, 06:50 AM
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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
Here's some good information:
Rotary Resurrection: S5 engine swap into a S4 car
01-08-12, 06:53 AM
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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.
01-08-12, 07:05 AM
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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.
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.
01-09-12, 09:47 AM
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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
Last edited by drift junk; 01-09-12 at 09:54 AM.
01-10-12, 10:46 AM
#15
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
01-11-12, 05:09 PM
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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
Here you go:
FSM: S4 Lubrication System
FSM: S5 Lubrication System
01-12-12, 01:11 AM
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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
Here you go:
FSM: S4 Lubrication System
FSM: S5 Lubrication System
01-13-12, 03:05 AM
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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%.
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%.
01-15-12, 10:24 AM
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rotary ressurection
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
Here's some good information:
Rotary Resurrection: S5 engine swap into a S4 car
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