Rb26 Into Enr34 (R34 Gt-Four) - Wiring This Bad Boy In

[PSIKO]

Hi guys,

I've been putting an RB26 into an ENR34 over the last couple of days with some mates (we're accountants, so absolutely no useful skills to bring to the table here). Mechanically the car is good to go, however we've come across a hurdle. Yep, you guessed it - wiring.

I've done a search and there hasn't been a great deal of *useful* information in this regard, so I was hoping there might be a guru or two out there who could shed some light on the easiest possible method to approach this - here are the options we've come up with:

1. Send the RB25DE & RB26DETT looms to Sideshows Performance and have them re-wire it. I haven't looked into this much more than a google search or two, so no idea on cost or turn-around.

2. Re-wire the RB25DE loom into the RB26DETT loom using the pinouts.

3. Run 2 individual ECUs, one for the RB25DE bottom harness (fuse box stuff and alternator, gearbox, starter motor etc etc) and the other for the RB26DETT for the engine specific items, and wiring in anything additional that might be needed (eg injector resistor pack).

- If anyone has done this before and knows of an easier method to do this, please let me know.

- If anyone has used this Sideshows Performance and can share their experience / cost / turnaround that'd be great; or

- If anyone can suggest (with certainty) which would be the easiest for us to do, that'd be most excellent too. Please bear in mind the above information regarding me and the other guys being utter noobs at wiring, however we can read and understand pin-out diagrams. We just don't know if the method we were planning would be the right approach or not.

p.s the pin-out diagrams we were looking at are R34 non-GTR and R32 GTR from the respective service manuals.

Thanks all.

tl;dr:

put rb26 into 4wd R34

wiring is issue

what is the best approach to re-wire it in?

[JH32]

...(we're accountants, so absolutely no useful skills to bring to the table here).

We weren't that bad, were we! hehe

With regard to point 2 above, we just have no idea where to start. As mentioned, we have ECU and wiring schematics for both the RB25DE and the RB26DETT however somehow we have ended up with the original RB25 lower harness still connected to the fusebox etc, and the RB26 lower harness went in with the car which I think was partially connected to the gearbox and perhaps the starter motor? Anyhoo - we now have 2 sets of battery terminal connections etc.

Advice muchly appreciated!

So annoying because the engine is just sitting there begging to be started!

[PSIKO]

Bump

[Mitcho_7]

I'm not an expert by any means, but if you have an rb26 engine you should use the rb26 ecu and wiring

[ARTZ]

are you using a standard or aftermarket ecu...

either way I'd think just use the rb26 ecu and then just rewire according to the CORRECT R34 pinout diagrams.....

Cant be too hard though Im sure it will be

[sydking]

the workshop i used for my conversion, Rb26 into a GTS4, so using the same rb25de ecu as you - im certain that he mated the wiring, So option 2, There is also a bloke on here that will do it for you if you send him the looms. Not sure how much he charges.

P.s im am using a PFC, Not the 25 ecu

[Mitchee]

What series RB26 is it? If its an R34 RB26 you can retain much of the RB25DE loom & engine sensors and simply plug up to the RB26. You'll have to make something up for the TPS to mount correctly or rewire the TPS plug. Then get a Nistune fitted to the RB25DE ECU and chuck a RB26 map onto it. Will need to upgrade to a Z32 AFM or something also. If its an R32/33 RB26 then you'll need to rewire the CAS plug and the same with the TPS.

Alternatively, you can use the RB26 engine loom and ECU, and make the wiring changes required to get power into and out of the loom at the dash plug near the ECU. The problem here is that if you have anything but an R34 RB26, you'll have to cut out some of the old R34 RB25DE loom which carries ABS and the wiper/passenger side indicator wiring. Theres also the alternator and knock sensor loom you'll need to cut out of the RB25DE loom and move that into the 26 loom.

Not any easy job by any approach unfortunately, especially if you have a non R34 RB26 in there.

[VFRegal]

It's an R32 RB26.

Standard ECU. Problem with just "wiring in the pin outs" is that the harness contains wires not related to the ECU. It's pretty hard to just drop the other harness in and leave it loose as there is only enough room for one harness through the firewall. I think the best approach is to remove both harnesses, split and combine. Would be nice to get a proper harness drawing and not just a pin out drawing.

Has anyone seen something like that ?

Mitch, can you do away with the R34 ecu completely once the R32 ecu is installed or does that contain any non engine info like abs, bcm type stuff ?

[Mitchee]

R34 ECU doesnt need to be there to run anything. ABS and all that have their own ECU's. You just need to patch together the corresponding wires in the body loom plug thats about 30cm up from the ECU end of the loom on each one, so that the R32 loom can get its power feeds and signals into and out of the ECU to the dash, fuel pump relay etc etc.

You can see someone in the process of doing this here: http://lh3.ggpht.com.../s640/photo.jpg

About 30cm up from the ECU end of the loom is the body plug. This is various in/out signals to/from the ECU to things like tach signal, speed signal, A/C signal, power feeds etc etc.

The problem is that the R34 loom also carries more through the firewall compared to the R32 loom. The R34 loom has passenger indicator, ABS, and some power feeds that connect down near the headlight too. All of these need to be removed from the R34 loom and added into the R32 loom.

If you dont have the patience to dismantle both looms and collect full wiring diagrams of each in order to know what needs to go where, then send it on to someone that does. You'll pay a fee but it will literally be plug and play. Theres nothing worse than assembling a custom wiring loom thinking you have everything correct, only to have missed an ECCS relay wire and have nothing work. Pull it out, start again. Not fun.

[PSIKO]

Hi guys, thank you very much for the information, especially Mitch

We'll pull the harness out and see how much of a job it'll be in that case to splice it all in as per what is happening in the pic; we've got all the pin-outs etc.

If worse comes to worst, we'll just have to call it, send it off to one of these PnP experts and plug it in that way

Cheers guys!

[_x_FiReStOrM_x_]

http://2.bp.blogspot...ing+Diagram.jpg

Is something like that any more help to you?

Edit: Nevermind, just re-read your first post.. I feel stupid now

Edited January 9, 2013 by _x_FiReStOrM_x_

[Don Dada]

Couple questions....

Was the Gt-four originally auto or manual?

What model gtr is the 26 from,and are you going aftermarket ecu or stock?

Also keen to know if you get the four wheel drive to function as normal.

[JH32]

Don Dada, the GT-Four was a manual originally, and the 26 is from an R32. To start with the ECU will be stock but may be swapped later for a PowerFC/Link or perhaps a Nistune type arrangement. I can't imagine the 4WD will be a big drama because as far as I understand it also runs off its own ECU.

Mitch_Rona, many thanks for your help mate, much appreciated. We're going to take a look on the weekend and see how far we get. I don't suppose you have anyone that you would recommend to do the wiring merge? I note your signature makes mention of electrical work! hehe.

[Mitchee]

James, I see you're over in Perth. I've got a mate who's an absolute wiring guru over there (i think the NOR area) and he would be able to do the job pretty easily. I can put him in touch with you if you want?

[Don Dada]

Well being originally manual takes lots of headache out of the equation as auto ecu "interacts" alot more with abs and attesa units and would have made it very difficult.

Well....Its should be as simple as removing the 25 engine harness,separate the abs and what ever other body harness from it, and then replace with the 26 harness, and wire that in to the car via the white plug as shown above

[VFRegal]

Thanks Mitch,

We'll get the 25 harness out on sat and have a look. I stripped the 26 harness down and found about 14 wires which will need to be cut and spliced into the 25 harness.

What would be handy is the pin outs for the 2 main plugs that are up in front of the strut tower. Would be nice to know if I can just plug the 26 harness directly in or not, rather than having to chase all the wires down and find out where they go.

[Mitchee]

The r32 loom will take some power feeds from that plug near the headlight. However the r34 loom gets all its power from the large white plug up near the ecu. There is approximately zero information out there in regards to pinout information of this plug in the r34.

If you can find someone with an r34 electrical circuit schematic book, ask them to take a photo of the dual a3 size diagram and post it here. I'm currently searching for it too as I'm about to wire a haltech in and the pinout for this plug would be super handy.

[VFRegal]

I've got a copy of the r34 service manual. has a fair bit of electrics but it is spread out. Would that help ?

So those 2 plugs near the headlight won't be a direct plug in situation ?

Thanks,

[JH32]

James, I see you're over in Perth. I've got a mate who's an absolute wiring guru over there (i think the NOR area) and he would be able to do the job pretty easily. I can put him in touch with you if you want?

Cheers Mitch, that might end up being an option! As VFRregal mentioned, we'll give it a crack this weekend and if it's way too far beyond us I'll get in touch with you

Hopefully we can pull a rabbit out of a hat!

[Disa_G]

Hello Gays !

I have my ENR34 with RB26 bilt about 7 years ago.

And all wiring diagrams that you need. Can send it if somebody need ...