S2 Rb25 Conversion-a31 Cefiro/r32 Skyline

[RB30 Ceffy]

Okay. I figured Id get one of my cars running good so I can sell it and I had a S2 25 kickin in the shop so decided to toss it in. Everyone that’s done the swap has said its easy as pie so I searched for hrs on this site and came to a few threads with information on RB25 conversions but some of they’re info is wrong and colors of wires are wrong and half the time you cant even understand what the hell they’re talking about because of they’re punctuation.

Below is some of the info that I have put together from other members on this forum. I need to sort out the junk and get the correct info. When im done with this I will edit this page and have a step by step for the S2 engine. I will have PICTURES and actually tell you guys what the wires your cutting up are for and not just letting you know you need to cut it like the rest of the info on this forum. I can do this within a few days if I can get some help from you guys.

***I found this on another old thread from another member:***

Now for the wires.. I didn't hook up A/C as there was none.

In the R32 engine bay there are 2 plugs by the passanger side headlight.

You use 3 wires from one of them only. The other plug is for an Auto.

The 3 wires on the R32 are (Black/Red, White/Purple, White/black) the 2 large ones, are for the power to relays etc, the White/Black is power to sensors etc.

Now in the same location there is a single plug that runs from the RB25DET. From this it is only the grey wire that is spliced into the Black/White on the R32 plug. This is power for the injectors.

Under the dash at the SMJ you need to run 3 good sized wires up to the 3 in the engine bay on the R32 plug.

There is a Red/Black, Red and a Black/White

R33---------------------------R32

Black/Red---------------->White/Purple

Red------------------------>Black/Red

Black/White-------------->White/Black. (has the grey injector wire also attached to it.)

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NOW WHAT I THINK:

Now I cannot find a Red wire or the Black/White wire on the R33 SMJ. I found a black/red one but that’s it. This is the important part I guess. I really need to know where to hook these 2 wires in the engine bay to the SMJ. Thanks

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This is all that is needed for the car to run.

Now you just need to attach water temp, fuel pump relay and tacho under the dash.

On the R32 under dash loom there are two plugs. The colours are similar.. you need to use the ones on the smaller or the two. 14pin. The other has 18.

R33----------------------------R32

Blue/Black ---------------->Blue/Black. Water Temp. ( you also need to use the RB25DET engine sender. (single wire)

Yellow/Blue---------------->Yellow/Red. Tacho

Black/Pink------------------>Black/Pink. Fuel pump.

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NOW WHAT I GOT TO SAY ABOUT THIS:

I found all 3 wires inside the car just fine but when I went to match these up with the 3 others on the R33 harness's SMJ I found 2 yellow/red. I was like okay… I will just see if I can find the other end's of these wires at the Coil harness for the tach signal. I did see one yellow/blue wire on the TPS Sensor but couldn’t find the other one. I DID find the other 2 wires.

Sorry for the long post. Most of you guys might not even read this but any help on this will be very helpfull!!!!

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Edited May 12, 2007 by RB30 Ceffy

[predator]

It's been so long I've done it (12 months), I am probably not much help..

But not *all* of the colours match...you're best off with the pin diagrams from the ECU's..

I do remember the yellow/red and I believe one was just auto only... TPS also has an extra wire for the auto ecu to decide the kick down and things, but that is not required if you're going manual.

With your relays, the red I believe you just need to find a 12v constant, or 12v IGN (I forget which), as the r33 ecu is slightly different with the relays - and those wires don't go up into the engine bay like the 32 does. The thick black/white stripey is ground *from what I remember* so can go to chasis.. but anyhow, make sure you check.

My memory is so rusty, I really need to check the wiring again.. but that would require pulling out everything at the footwell.