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rb25de neo vs rb25det neo ecu harness

eli995
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eli995 Apprentice

eli995

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this may be an obvious question but does anyone know if the connection point to the rb25 NA neo is the same as the rb25det neo? i assume they are but couldnt fimd aything on the forum and i want to get the RB25DET NEO TO RB25 S1 S2 ECU Patch Harness instead of spending the extra 1k. if theres any other connections id need to add to the ecu any info would be greatly appreciated.

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robbo_rb180 Grand Master

robbo_rb180

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Both r34 ecu connectors are the same.

Easiest way is to just have both looms out laid out, both wiring diagrams and remove what is not needed on r34 loom then get new plugs and wire up whats required to r32 body plugs so its complete plugin. If using the standard r34 ecu.

Are you wanting to run the Neo on a non-Neo ecu? Injectors, coils, IACV and CAS are all wired different.

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eli995 Apprentice

eli995

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also im trying to use the rb25 neo with the adapter for the rb25 neo to the rb25det on my 1992 r32. and im using a link ecu froma rb25 and i have a s1 head and will be using non neo  Injectors, coils, IACV and CAS are all wired different.

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robbo_rb180 Grand Master

robbo_rb180

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Essentially everything is non neo so no need for Neo loom then. Change plugs required on r32 loom which is easy.

Anything additional can br wired and program changes in the link ecu and be fine.

I started with a link plugin and factory loom in my sil80 before going an xtreme and custom loom.

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eli995 Apprentice

eli995

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i only have the rb25 neo loom i bought an adapter from wiring specialists to fit an rb25 ecu is the neo loom practically useless? or can i still use it as a rb25 s1 loom with some wire added on?

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GTSBoy Grand Master

GTSBoy

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On 8/19/2022 at 5:01 AM, eli995 said:

i only have the rb25 neo loom i bought an adapter from wiring specialists to fit an rb25 ecu is the neo loom practically useless? or can i still use it as a rb25 s1 loom with some wire added on?

Much of the Neo loom will be the same, but there are many differences. You will need to bell it out to make sure that the right ECU pins are going to right field devices, and many of them won't be. The Neo has different field devices (such as the boost sensor) using pins that are used for other things on the vanilla 25. You might end up having to take it apart in places to make it reach the devices it is supposed to, repin at the ECU end, etc etc.

You're going to need the entire R32 wiring diagram, so you know the body side wiring and how to integrate it into the engine loom, and you're going to need both the Neo and vanilla 25 wiring diagrams to find all the differences and straighten them out.

it would be far easier to piss off the adapter and just get a vanilla 25 loom. Far less bodging.

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