Jump to content
SAU Community

Recommended Posts

Hi All, Ive recently pulled my head in and gotten started on my 2year long project for my R32 RB25 swap, I went into it head high and confident it was an easy swap and plug and play wiring. I was wrong. The engine is a S1 RB25 and I'm running RB25 ECU And loom.

I got the swap done a few weeks ago and have been working on the car on my time off, however i cannot get the engine to run, at first the engine would crank however the fuel pump would not run,  i dove a little deeper and realised that i would need to connect the wires from the RB25 Body Loom and the RB20 Body loom. went through the ECU pinout and followed the wires from the Body looms one by one to find what was needed to start the car.

Now I have rewired the RB25 loom with the old R32 Body loom attached, however i am still having issues starting the car, now the pump works but still wont fire. 
The car has spark but looks very weak, however I'm suspect that its not getting any fuel. I have read a few posts related to the "Main plug" near the air intake however cannot find any information on what wiring to hook up to where. 

If anyone has done this swap, or has any knowledge at all on RB25's into 32 i would really appreciate your comment regarding this, im really keen to get this car finished. 

Thanks in advance

This is a simple swap when you reuse the RB20 loom and auxiliaries. I run a standalone, but if I remember right, using the RB25 ecu you only have 2 injectors to inverse. 

There are many DIY's on this subject online, including this forum. 

 

Edited by TurboTapin
On 06/11/2024 at 12:44 PM, TurboTapin said:

This is a simple swap when you reuse the RB20 loom and auxiliaries. I run a standalone, but if I remember right, using the RB25 ecu you only have 2 injectors to inverse. 

There are many DIY's on this subject online, including this forum. 

 

Thanks mate, yeah I've heard that alot and i am definitely regretting using the 25 Loom now, i have gone through and traced all the plugs from the 20loom and re wired them into the 25 loom, I have currently got Crank, Fuel and accessory's working, just need to finalise the loom and run the wire for the Ignition (Spark) and it should be running, will update if i have any luck.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Guys since i bought r33 gts25t coupe 1994 automatic a/t(manual swap 350z gearbox)  all i got is problems, always problems. Lets start with that when i turn key into ignition(ON) fuel pump doesnt always works. Sometimes i have to turn key twice Off/on/off/on until it primes. Its new, dw300 - 340lph. My gearbox broke so i did gearbox swap, install different intake manifold, injectors and i take pipes. Car was sitting in garage for more than half a year. I did assembly all not that long ago and when i turn ignition cant hear prime. All of sudden it stopped working. Theres many videos on YouTube how to make relay mod on r33 straight from battery so i did and it doesnt work! 😰 30 - battery positive  87 - positive from fuel pump to relay 85, 86 - one of two wires from original fuel pump wires(light blue, grey) and it didn’t work. so I check on ignition and took original BLUE relays wires from trunk, next to fuses. (I believe it’s IGN+ and ECU pin 18. it didn’t work…  tried connecting (IGN+ from og relay) and (ECU 104 from 1of4 FPCM wires) to my new relay 85/86 and it didn’t work.  I unplug FPCM. Didn’t work. im thinking what’s wrong   fuel pump is working, if I leave IGN+ on 85 and 86 straight to ground it works but it’s just nonstop. Since it getting constant 12v after key in ON. light blue wire gives me 6-8v.  so how this should be connected? What causing ECU not giving — on pin? Or I did sth wrong and that’s why it doesn’t work? I need negative signal on ECU that control fuel pump. What this should be?
    • You can use your VIN to look up the factory part number somewhere like amayama, and then look to order new if necessary. https://www.amayama.com/en/genuine-catalogs/nissan Depending on price you might want to rebuild instead. @GTSBoy I had an interesting insight into US market parts when the Titan rear calipers were sticking. New calipers were dirt cheap, about 20% more than a rebuild kit....they are just considered throw away maintenance items
    • Funny, but really not funny. Thank god (most) f the world has moved on since then
    • Lots of votes for driving onto a plank first; that is the quickest way I've found, 25mm is enough for my case but that will vary by car It also depends where you are going for. On the 32 I can get to the rear diff with my floor jack if I do that end first, and get it up on stands. Then I lift the front from either front tow hook as high as needed, also onto stands. Sometimes I need a small lift on the other tow hook to get it level enough If I do the front first I can't get to the rear diff because of the angle of the car Other options are getting to the front mount of the rear subframe from in front of the wheel (if only lifting one side, or just do both which is a bit of a pain compared to one lift from the diff), or also the gearbox cross member mount on the driver's side if you are  just trying to lift the driver's side. I This is the jack I use; it says 75mm clearance but of course that is only on the lower section so if you have to reach too far in like the diff you still get stuck. https://www.snapon-bluepoint.com.sg/category/Floor-Jacks/product/Floor-Jack,-2-Ton-Low-Profile
    • On the bright side, the weather will turn much nicer for working outside shortly....sounds like you might need to start on a neighbour's garden next
×
×
  • Create New...