Lavitzlegend

iTrader: (3)

So I'm putting a S5 NA engine in my S4 NA car and long story short, I will be putting the s4 connectors for the FEM-01, FEM-02, EM-03, EM-31 and F-31 on to the s5 harness so it will plug right in to my s4 car.

Now I have the wiring pinouts of both harnesses already, but my question is do the colors of the wires stay the same? Can I put the Black/Blue wire on the s5 harness in the spot on the s4 connector where it had a Black/Blue wire from the s4 harness? I'm trying to decide how to make a decoder to figure out which s5 wire to put where in the s4 connectors.

Any help is much appreciated. Thanks!

FelixIsGod29X

iTrader: (50)

Long story short use keep your S4 n.a harness. I dont understand why everyone thinks they have to swap harnesses.

Lavitzlegend

iTrader: (3)

Well thanks for your opinion I guess but I have an extra set of the S4 connectors, Power FC that is meant for a s5 harness, etc etc. So I want to just push the blades out of the s5 connectors while I have the engine out of the car and make it so I can just plug it in to my s4 connectors when doing the swap.

I just wanted to see if someone had a diagram or some reference that could help, not just an opinion on something else I should do. I think I'll just spend a while in the Haynes manual figuring out which color wire goes where and make my own cheat sheet, just didn't want to redo this work if someone else had the information available.

FelixIsGod29X

iTrader: (50)

So your going to swap harnesses and repin it just so you wont have to buy a S4 power fc patch harness? I would just keep everything S4 besides the block and intakes. 100 times easier and quicker. IMHO your going to go through an awful amount of trouble just because you have a S5 patch harness instead of S4.

Lavitzlegend

iTrader: (3)

The engine has flow tested and clean s5 injectors, ported and port matched s5 intakes, tb, etc. There are quite a few reasons why I am wanting to keep the s5 parts and it really won't be that difficult to repin the connectors once I know which wire to put where. I understand why you suggested keeping the s4 harness but this is why I said long story short. There are quite a few reasons as to why I want to keep the s5 harness and if I can spend some time figuring out which wires to swap instead of paying 300 dollars for a patch harness from Banzai (no offense to them because I hear really good things about working with them), I will just swap the connectors.

FelixIsGod29X

iTrader: (50)

Alright well when you do work on the harnesses try and log some pictures. Could be very helpful for others on here in the future.

Banzai-Racing

iTrader: (11)

We do not sell a S4 to S5 harness.

I suggest you look at the ecu pin outs, good luck. It is a lot easier to solder S5 injector connectors. It is not like the S4 ecu can control the VDI or Aux ports, so it will be a huge waste of time and energy. Not to mention the CAS connector is on the alt harness on the S4, emissions harness on the S5.

There is a reason we do not have an adapter for what you are trying to do

DR_Knight

iTrader: (23)

To help you I just did a s5 t2 in a s4 Na. I began reading the pink it's and later decided it was getting ridiculous and just swapped the chassis/dash/charging harness to s5.

You have to deal with a lot of very different connectors and how things are routed. Change manifolds to s4 and keep the motor as thinking it's a s4, but if you really want to go this route good luck. I've asked for help doing this for years and got no help.... One guy said he did it and never responded with advice or pinouts

Lavitzlegend

iTrader: (3)

Well it's actually turbo II housings and intake so no vdi or 5th and 6th ports. It's turbo housings with s5 na rotors and bridgeported and it came with a PowerFC and your s5 PFC Harness Adapter. I bought this engine off of jorx7 who I think had you guys originally set up the PFC.

So will I have to do something special for the alternator? I didn't realize that would be an issue.

DR_Knight

iTrader: (23)

Most of my knowledge is in s5 turbo but is it possible to use s4 electronics with s4 throttle body s5 manifolds like the turbo guys do when having a s4 car with s5 engine?. Ditch the s5 omp anyways

Lavitzlegend

iTrader: (3)

no omp already. Not sure about the throttle body but the s5 one on it is ported and butterflies removed plus the greddy intake elbow would not fit my s4 na tb...

Banzai-Racing

iTrader: (11)

Just buy our replacement S4 adapter and use the S4 harness. You can't use a S4 dash harness and S5 emissions harness in the same car. You would end up needing to hack everything up, chances are the car would never run. You should already have the intake air temp and map sensors, so for $200 your existing harnesses become plug and play. Our adapter even has wiring for the S5 TPS if you want to keep it

Scroll to the bottom APEXi Power FC Adapter Kit (86-88 RX-7)

Lavitzlegend

iTrader: (3)

Ok so after looking at the ECU pinouts for S5 and seeing which connectors everything goes to..... I've decided to take your advice and use my S4 harness and just change a few of the ends like the injectors so that they will plug into the s5 parts on the engine. I'll swap the alternator with my s4 alternator as well.

However, I still have a question about the TPS. My S4 only has 1 TPS and the S5 has 2. Can I swap my single TPS on to the new engine in the narrow band TPS spot and just not use the second TPS? Will the PowerFC with S4 Adapter Kit work fine with only 1 TPS or is it expecting to see 2? I think you were hinting towards that when you said I can get the adapter with wiring for the S5 TPS but I don't fully understand what you mean by that. The TPS connector is up on the engine so how should I connect it to the adapter that will be at the ECU? On a side note, what is the typical lead time for you guys to make and ship your S4 PowerFC Adapter Kit?

I really appreciate all the help you guys are providing and I feel like I'm getting really close to having everything ready for the swap.