S1 RB25DET to RB26 Wiring info

[Chi-Town]

Sorry about the repost but I figured this title was more accurate. I've searched a bunch but haven't found the info I'm looking for so I'm starting this thread.

Is there a post or diagram showing the wiring changes needed to put a RB26 in a S1 RS4 Stagea? (please provide link or file)

Is there a post or diagram showing how to use a factory S1 260RS engine harness in an S1 RS4 Stagea? (please provide link or file)

Does someone make an ECU adapter harness so go from S1 RB25DET to RB26DET?

Information I can share so far:

Factory 260RS harness is similar to the RSV harness but is missing the Black and White connectors behind the LH headlight and the wiring is different at the connectors near the ECU.

RSV harness lacks the wiring / connections for the following:

Second O2 sensor

Second MAF wiring

Intake decel valve

 

Any help is always appreciated!

 

Edited September 3, 2023 by Chi-Town

[Duncan]

When you swap the engine, you swap in the engine looms and ECU as well.  Therefore the things you've listed above won't be an issue.

What you do have to deal with is differences in where the engine loom plugs into the body loom near the ECU, the engine loom to the engine bay loom near the power steering reservoir and probably also the engine sub loom that goes under the plenum.

Sorry, I don't have specifics of the differences, you might need to use the gtr engine loom wiring from the R32 gtr manual and a multimeter on the car to work out the differences

[Chi-Town]

@Duncan thanks for the reply.

That was my original plan, use the 260RS engine harness (I have all 3 pieces) and sort out the interior plugs.

What I ran into that worried me was the 2 plugs behind the LH headlight that aren't on the 260RS harness. They have some heavy gauge wire in them. I noticed the R33 GTR harness has them though?

Do you have a copy of the 33 manual in English?

I have the front end/ fuse box harness from the 260 also if I need to go that far.

 

 

[Murray_Calavera]

8 hours ago, Chi-Town said:

Do you have a copy of the 33 manual in English?

 

Here it is.

R33_Wiring_Diagram.pdf

[Chi-Town]

Thank you sir!

[Chi-Town]

Ok these are the connectors I'm stuck on.

The one is near the ECU and the other are behind the air box.

Anyone pin these out before?

Thanks!