Which harness for a Z32 ECU on RB25 motor?

[Matt300ZXT]

I posted a similar thread on another subsection but I haven't got a single hit, thought this section might be a bit livelier.

I've seen many people use the Z32 ECU to run an RB25 with better results than the RB25 ECU. I am considering putting an S2 RB25 into a Z32 shell, so it's even better for me to run a Z32 ECU, so the body harness stuff plugs right in.

Anyways, my question is which new harness do I buy? Do I buy an RB25 harness with the Z32 ECU plug on it, or do I buy a Z32 harness and just connect the proper wires to the proper sensor on the RB25 motor?

[fearlessKouki]

z32 ecu would have issues due to z32 having 2 o2 sensors where rb25 only has one sensor. you might want to look into using a maxima ecu and no wiring is involved with that ecu. its plug and play, just has to be tuned for rb25. hope this helps.

[Matt300ZXT]

I've read Nistune's walkthrough on modifying the Z32 ECU to be prepped for RB25 signals. Patching the O2 circuits together, modifying the fuel temp sensor circuit, etc.

[fearlessKouki]

why go through the trouble when u can use maxima ecu...they are cheap, pick one up from junkyard/ebay.

[Matt300ZXT]

Because I am putting it into a Z32 as the op said, that way everything plugs right in. Plus, having a tt Z32, I know tons of Z32 guys with parts to sell and already got one on it's way for $65.

[fearlessKouki]

Not quite sure what you mean but the ecu plugs into engine harness and nothing else so it doesn't matter what ecu (rb25 or z32 or maxima) you use.

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[Axel18]

Currently researching a lot about this, im gonna be using a Stagea NEO Rb25 with a Z32 ecu, so far my understanding is, Z32 + R33 Engine loom (S2 Rb25 Wiring loom if im not mistaken) will work perfectly by following Nistune's guide if its a S2 RB25. The S1 Rb25s i havent read much about them, should research if you have one of those.

I even matched each ECU pin from both pinouts (R33 RB, Z32)and arrived at the same steps as Nistune indicates.

[OutToWinPAHC]

You use the R33 harness and you repin the firing order signals for coils and injector pulses. The 02 signal back is split, simple repinning.