New kid on the block

[Songo]

Hi Everyone

I am from West Pennant Hills in NSW.

Been too busy until recently to attend to my RB25DET Series 2 engine until recently.

I am planning to stick it into the S15 shell at this stage, unless a nice SR20DET turns up...

For now, i am going to try and get the RB25 running and working well then decide what gearbox to use.

My preference is to retain the SR20DET  6 speed gearbox and tail shaft to retain as much and least modifications as i can avoid.

I am an old guy and won't be doing any heavy drifting so i don't need a bullet proof gearbox

Does anyone have experience with starting the RB on a stand?

I got everything setup as much as I can with the info i can find... endless searching and videos on Youtube

I would be great to get some pointers

Cheers

Songo

[GTSBoy]

Starting on a stand is no issue. You just have to wire everything up, give it fuel and cross your fingers that the stand is robust enough. Arranging the inlet plumbing is often the hardest part, without any surrounding structure to hang some of it from.

No need for coolant if you only want to run it for <1 minute.

As to the gearbox - I think the little Aisin box is a bit stronger than the other small Nissan boxes that went behind SRs, but I wouldn't be too keen to test its limits with the torque of a boosted 25. I don't know if you can retain the box and the tailshaft. The box won't connect to the RB without an adapter of some sort, which is either a plate that will push the engine forward (which is not good for fitting it into the bay's available space) or push the box back, which messes with the box position and tailshaft length - OR - cut and shut work on the bellhousing, which is a long way from "least modification".

I'd be buying a new 370Z 6 speed or similar, doing what has to be done to that to make it fit RB (ie, cut and shut bellhousing) and the requisite tailshaft custom/mods.

[Songo]

thanks GTSboy. My confusion at the moment is i am trying to locate the ignition, ECU battery power and the ECU negative

The closest thing i can find is the for the S15 on Page 8 of the Wiring Specialties web page

https://drive.google.com/file/d/0B9F33_M_GgENQnZ6STMxVmVNd1E/view?resourcekey=0-eZ4nNRwRoqa1qvKlWWHm8A

I cannot find the same diagram for the R33 RB25DET Series 2 dash plug pin out....

Do you know what the Pins? or know where i can find the same pinout diagram for the RB dash plug?

Thanks for the advice on the box... i like a 6 speed so might be on the lookout or the box now.. a topic of discussion for another post...

Edited 14 hours ago by Songo

[Duncan]

Yeah it would be nice if someone took the time to put that sort of information together, but there are a lot of variations in looms.

I think you are making this way hard for yourself if you just want to get it running....sourcing an SR20 with the right wiring will be a billion times easier than matching the RB loom to an S15 chassis.

If you do end up going this way, you just need to trace every wire in the loom with a multimeter, 95% of them will go to a location you can confirm at the ECU.....and then post it up for the next person who needs it  

[Songo]

Thanks Duncan, I am actually just trying to get the Rb turning and running with the RB25DET S2 original loom itself 

I am just trying to get it going outside the body and not thinking about the S15 or trying to match anything to the S15 loom at all

I am only trying to see if anyone has done this and what pin they found to be the ignition trigger and ECU+/- on the dash connector, that's about it.

Thanks

 

[Duncan]

Yep...so unless someone posts up the answer you will need to probe from the ECU connector to the dash plug with a multi meter in continuity mode to trace the wires.  Note the ECU has multiple - and + (and across different key settings - Battery, IGN and Start) and most likely the power is fed from the connector(s) that is normally near the left hand headlight.

[GTSBoy]

2 minutes ago, Songo said:

I am only trying to see if anyone has done this and what pin they found to be the ignition trigger and ECU+/- on the dash connector, that's about it.

The wiring diagram for the R33 RB25 is freely available, and is essentially the same same as most other RBs (just with differences as to which pin # does which job).

To get the ECU to power up, you just need to provide power to the ECCS relay, and have the other power feeds that come in from the top left of the wiring diagram (wrt the ECU) that give perma power to the fuel pump relay, the ECU itself, etc etc, all connected. When you put power on all these it will just come to life. It's pretty clear from the diagram what needs to happen. Just follow the lines from the 12V + supply stuff in the top left over towards the ECU. I've even posted snips of such diagrams (not for vanilla 25, I think for Neo and 26) to various threads here in the last few months, talking about what it takes to get the fuel pump and FPCM up and going. Search these up and they will help get you started on doing the same with the vanilla 25 diagram. Hell, for all I know, I've done the same with that one in years past and have forgotten.