RB FAQ

[IKKarma]

Whats the horse power diff. Between the rb25det neo and the rb25de

[Pandapants]

I think the de has about 60hp less.

[lg54]

somewhere i heard that the stock turbo elbow on a rb20 wont fit, it will hit the steering coulmn? truee that?

[Sileighty_85]

depends on the mount kit but pretty much yeah it wont fit
You gotta get an aftermarket one and put some dents in it

[lg54]

^^^ thanks, what do you mean with dents?

[Sileighty_85]

gotta dent it so it can clean the steering shaft, unless you get the SYKO mount kit that comes with a special custom elbow to clear it

[singlecamslam]

question, my turbo oil drain gasket is leaking on my rb25. Can i use a t28 gasket, or do i use the T3 gaskets/ where can i buy one of those gaskets.

[redline racer510]

try nismoparts.com ask for Jeff shockey he can definitely get you any part for your rb

[singlecamslam]

awesome ^. He gave me the part number and i just ordered in from the dealership. It looks like they are RB specific. If anyone is interested the part # is 1519673L00

[Pandapants]

I'm using ka24e injector o rings and rail insulators on my rb20 if anyone cares. 500+ miles so far and no leakage.

[redline racer510]

I am looking for the timing cover grommets for rb25. Called a bunch of dealers and aftermarket part suppliers and they seem to be discontinued can anyone help?

[Sileighty_85]

the grommets from the VG30 cover are the same.
i think i got mine from Courtesy

[redline racer510]

cool thanks

[redline racer510]

Im getting ready to drop in my rb25 into my s14. My car is a 95 240sx that originally had an auto transmission and would like to know if wiring the reverse lights, 5th position light, neutral switch the same as showed in the s14 auto to manual swap thread?

[s14owner95]

(My KA blew up, and I was 80% ready to go back to an SR, but something in my head talked me into an RB25 (mainly because I lied to my wife and told her I could get away with it for cheap, somehow that convinced myself too, stupid stupid!)

Hey I know this is a huge post, but I didn't want to clutter the forums with another thread. I read through this whole RB FAQ section and it hasn't come up. Although, I could ask what spark plugs, oil filter or belts to use for the 800th time..

So I bought an RB25DET... supposedly out of an R34. Of course google R34 RB and all you return is NEO. This motor has a metal turbine, no secondary butterfly on the throttle body(that ugly solenoid), side feed injectors, a 4 row ECU (which I haven't got from the company yet), the plastic CAS, coil pack ignitor but a push type clutch...what the hell do I have? A hybrid? Also, doing the wiring I've found that I have a lot of connections on the ECU wiring that only goes to A/T stuff. *sigh*

I'm an avionics technician in the Navy, so I do wiring for a living, seems stupid to send off my stuff and waste my own talents. (But good luck finding an R34 Non-NEO wiring diagram, the google search "R34 scribd" returns the FSM for the R34, but the diagrams it shows always has the NEO version DET motor.

Question 1: So as it stands, I unpinned all my ABS stuff from my KA to try and make it work on the RB (since ABS is independent), but I'm stuck with 4 wires that go the ECU that I don't know what they are exactly, and if I need them in the RB harness (I know, ABS is for lames, but I figure what the hell, I'm already balls deep into this thing, I might as well do it, plus I don't have the money to delete it right now). There are 4 green wires, and one yellow and red (I know the black one is to a common ground). On the RB side, i only see one pin from the ECu that is a ATS/ECM/ABS combined ping. So anyone know how to finish this wiring off?

Question 2: Since the company hasn't sent my ECU, does anyone know what the ECU code is for my engine? I'm guessing it's an R34 non-neo?

Question 3: What the hell am I doing?

Question 4: (it's a long one, and I posted it down under in Skyline Australia)
I have searched 100's of Google Pics, looked for write ups from various people but I think I can only get the right answers from the people who actually OWN the cars.. So if you've got that information as well, I'd appreciate it. So here's where I'm at. I took some pictures to show my dilemma.
Here's a picture of my motor how I received it:


I need to know what the connectors in RED go to (yes, I know one is a light, what light?) I figured out after I stepped away from the mess for a second, that the gray wire is for the ABS sensor on the front LEFT tire on a Skyline, so I'm going to evaluate the harness and see if I need to move it to read the front RIGHT of the 240sx


Here's a close up of that bundle of wires, I know that they go right around the MAF:


I also need to know about the other half of the wires, the connectors on the right are under the dash, and the connectors at the top are in the engine bay, and most of the wires are contained in that bundle:


here's a close up of those connectors:


I researched Yahoo Auctions Japan and found those two grey connectors go into this box, but one auction says they are an Auto Mission Computer and one says that it's an ABS Computer, it's under the dash:

[Sileighty_85]

fuck man you choose the wrong model if you though it was gonna be cheap.

Send me the P/N on the CAS and I can TRY to pinpoint a year and trim model for your engine (After I get off work) although chances will be slim.
If you had that ECU P/N i could pinpoint it exactly.

If you find anymore P/N let me know. (maybe somthing on the Wiring harness near the ECU plug?)

If you need info or tips for install I have a big build thread on here for the S14 (S13 will be almost exact anyway)

dont ask me on wireing of that beast though, I will refer you to this guy though, www.wiringspecialties.com

I myself are an electrical engineer ina sense but I still have him do my wiring since I dont trust half the electrical info on the internet. His products are awsome, never had an issue with his work at all.

there are some other guys on here as well such as Jeff Jordan, that can do harnesses as well

[s14owner95]

Yeah I just read through your entire build thread (great stuff).. I know, not only did I pick the expensive version, then I had to be special and get an R34.. I kinda feel like that kid who wanted the S15 when the previous versions were just as good.. (but the R34 was the same price, and I was hoping for less miles..

I've been in contact with Yuri via email, but I'd really hate to bother him with questions when I'm trying my best NOT to send it out and pay 400$ for him to build it, seems a little unfair to ask for advice for something that you would normally pay for the service..

As far as part numbers go, I can send you an email I sent to JWT, but they haven't responded..

[s14owner95]

JWT just emailed me back and said that my engine is from an Y33, but when I referenced that in Yahoo Auctions Japan/Upgarage/Wiki it doesn't show the Y33 ever having an RB25, only the Y34. However, I did happen to stumble upon an auction for a WC34/R34 RB25DET ECU.. it doesn't mention NEO in it at all, and JWT suggested that a WC34 might have been another chassis.. did everything just get worse for me?

[s14owner95]

Of course, I forgot to mention that JWT also suggested my engine might be from a C35 laurel..

Also, I spoke to the guys at NIStune and they told me that if the ecu/connector is Gray then it is made by Hitachi (it also says Hitachi on the ECU's) and the blue is a JECS style (normal information I'm sure) but they were telling me that if you get an R34/C34/C35 engine like mine, but it's a non-NEO version, you can get an NEO Version ECU and use a NIStune on that, since they don't support the non-NEO version ECU.

I also made some progress on the wiring harness pics. The two gray and 1 white connector that are attached to a group of grounds and go to the engine bay are for the ABS system, so I removed that part. The blue connector goes to the "Turbo Pressure sensor" and the three wire gray connector goes to the "heated Oxygen Sensor" (I'm dumb for this one, since I pluged it in one.

But that one last big black connector, it's 8 pins. I traced all the wires, and it goes to various places:

Line Pressure Solenoid (A/T Only)
Line Pressure Dropping Resistor (A/T Only)
Control Unit Power Supply (Counter-Electromotive Current)
Control Unit Power Supply
The purple connector on the IACV
Air Conditioner

Do you guys know if these are input signals to the ECU? I obviously don't have the other end of that connector, and I can't seem to find the diagram in the FSM. (I should really just make a thread of my failure)

[Chrisbarlow891]

just finished my rb swap in the s13, i dont have pwr steering which sucks lol, how much for the set up? and what all does it include

[s14owner95]

check out ChaseBays.. they make a SICK kit for $239. You can add a cooler for $100 so that's $339, it comes with a new resevoir and all stainless lines.. or you can just buy an ISIS(or anyone that makes one) stainless line for like $99 and put in a DOHC system

[hybrid_eg]

need some info on trans rebuild.. rb25 series 2 trans.. has notchy 2nd and 5th.. running redline syncro mesh and solved the problem, car is going to have double the power in next couple of weeks so I dont feel like pulling the trans off later.. I know I need syncros replaced however does anyone know what part #'s or comparable model it will work from? Z32? anyone in socal rebuilt one? who did they take it to?

[s14owner95]

Does anyone have an R34/C34/Y33 RB25? It's exactly like a series 2 R33 motor, but the CAS is different, it looks exactly like the SR20.

If you have one, does anyone have the ECU code for it? I'm expecting my ECU any day now and I want to make sure it's going to be right. I've been searching Yahoo Auctions and they only seem to be selling A/T and RB25DE.. NEO6 motors are fine too, I can work with that

[rmrunner]

I know this is a zilvia site but i cant seem to find my answer anywhere else.

I have a 1986 c32 nissan laurel. Recently i installed a RB25DE series II engine and transmission. My entire cluster isnt working. Can anyone help me out. I was told by a friend that my tachometer is a single coil and needs a tach adapter. But my fuel gauge isnt working( changed fuel pump to a walbro high pressure) along with my speedometer and my temp gauge.

Although all my lights on the dash are working.

Please help....Thanks

[s14owner95]

Sounds like you didn't hook up all the dash plugs.. if they worked before the swap.

[lg54]

Hey guys i need help here.

i am wondering if the rb25 top feed fuel rail (used on greddy plenum) will fit the rb20.

they are both top feed. also, will it work using rb20 injectors.

please need some help here.

thanks

[SLEEPYDUB]

Anyway this FAQ could have all the FAQs on the first page, rather than sorting through 26 pages of nonsense and arguing? Just a thought

[MADE]

Originally Posted by s14owner95

Does anyone have an R34/C34/Y33 RB25? It's exactly like a series 2 R33 motor, but the CAS is different, it looks exactly like the SR20.

If you have one, does anyone have the ECU code for it? I'm expecting my ECU any day now and I want to make sure it's going to be right. I've been searching Yahoo Auctions and they only seem to be selling A/T and RB25DE.. NEO6 motors are fine too, I can work with that

I have seen YAJ mention Y33 having RB's but not sure if they were swapped or not. The numbers on my Zenki RB25DET NEO ECU say 06 (23710 AA502) The C35 Laurel R34 Skyline and 34 model Stagea all use the RB25 NEO engine. I have not seen a Non NEO anything in an R34 chassis. My guess would be its from a C34 Laurel.

[RB25240]

After reading the first page, with all the fighting I stopped, Anyways I've used the stock KA mounts and Drive shaft on my RB20 SWAP and that worked for a while, I did end up using a swap kit.

[MattRose]

Where can I get rb25det fmic piping? It's going on a mishimoto fmic with the inlets and outlets at opposite ends.