Jump to content
SAU Community

Rb26 Refusing To Run. Please Help. I'm At My Wits End!

PitlanePhotos
 Share

Recommended Posts

PitlanePhotos Newbie

PitlanePhotos

Posted
Posted (edited)

Ok, it's a long read and I am trying to include as much detail as possible. Please read and help!
So I have been racking my brain for way longer than I would care to admit to, I've read probably hundreds of threads from all over the internet and still have no idea what is wrong with my car.

Background info.
R32 GTR engine swapped for R33 RB26 which had been built by Mercury Motorsport a few years ago and saw seldom use since then.
Engine was running when it was removed from the previous owners vehicle. Sump and cradle were removed to sight internals. Bearings replaced with Cosworth items.
Engine was installed into my car after receiving a few additional parts (see below)
First start up was relatively smooth, built up oil pressure, cranked, started, coughed a bit, knock sensors were not in, this was on a Nistune ECU.

Car info before swap
R32 GTR
R32 RB26
GT2860R -7's
Standard AFM's
Siemens 610cc injectors
Walbro 460LPH pump
Turbosmart E-Boost street

Nistune ECU tuned by MRC Dyno

New Parts
R33 RB26 built by mercury motorsport (forged internals)
Tomei 260deg 9.15mm lift cams
Tomei valve springs
Tomei cam gears (set to 0/0)
Ross Harmonic Balancer

After the initial start up (which I believe this issue was still present, just masked by holding revs around 3k) the car was left for several months.
Nothing significant changed. Battery was replaced, new fuel added, oil and fuel filters changed.

The Issue

The engine will crank, but either struggle to start or cough and die.
Holding a constant throttle the engine will start, sit at approx 1,200rpm, cough a lot and then do one of two things.
Either A. Start firing sporadically incl. firing so early you can hear it firing back into the plenum!
or B. Randomly kick up it's revs, anywhere between 2,000 - 4,000rpm with no extra throttle input at all.
Both of these scenarios usually result in me turning the car off which then results in a loud pressure release sound (nothing venting externally) and me crying quietly in a corner.

Things I have tried
Unplug AFM's = No Change.
Resoldered AFM's = No change.
Unplug 02 Sensors = No change.
Replace Crank Angle Sensor = No change.
Replace igniter module = No change.
Rearrange coil packs = No change.
Replace coil pack loom = No change.

Replace spark plugs = No change.
Replace Nistune with Power FC = No change.

Please. Help?

Edited by PitlanePhotos
Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

Are either of the ECUs tuned for the 610cc injectors? Also how is your base fuel pressure and or fuel dampening (if any)?

Btw, Nistune needs the knock sensor flags disabled if you're going to unplug them as you've done

PitlanePhotos Newbie

PitlanePhotos

Posted
  • Author
Posted

Are either of the ECUs tuned for the 610cc injectors? Also how is your base fuel pressure and or fuel dampening (if any)?

Btw, Nistune needs the knock sensor flags disabled if you're going to unplug them as you've done

The Nistune was tuned with the 610cc's. Ran for 2 years with them. The power FC has had the injector %'s and latencies changed to suit.

Fuel pressure is approx 3bar, in tank regulator has been removed, fuel rail reg remains.

The car was run with the nistune, with knock sensors both connected AND disconnected.

And swapping to the Power FC made no difference so I don't see the issue being with the nistune (although it would have been nice and simple)

Power FC does not read any knocking when idle, but does register a tiny amount when the engine is coughing and spluttering as you would imagine.

PitlanePhotos Newbie

PitlanePhotos

Posted
  • Author
Posted

Are your fuel lines all hard braided Teflon hoses?

Also do you have a wideband connected?

Not braided. But fresh E85 rated hose.

Fuel is BP ultimate though.

I do not have a wideband connected unfortunately.

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • r32-25t
      R33 fuel setup

      By r32-25t · Posted

      I used the radium thing, makes the whole parallel assembly a lot more compact compared to any other way of doing it 
    • TurboTapin
      R33 fuel setup

      By TurboTapin · Posted

      Racetronix also sells those ethanol content sensor bypass blocks. Adapter, Flex-Fuel E85 Sensor High-Flow Bypass, In-line No Sensor (ADF-FLEX-NS): Adapters - Flex Fuel | Racetronix Ethanol content sensor are originally designed to be on the feed line. These bypass blocks are meant to be ran in the feed line and not return. The continental ethanol content sensors have a 3/8" ID and not 5/16". This is why they are ran on the return line directly in conjunction with a low threshold sampling value VS in the feed with one of these blocks.    Haha we think alike, I used both original feed/return for 8AN feed, and one of the Hicas lines as a 6AN return. I also capped off and left the other Hicas line as a spare. 
    • -Jimmy-
      R32 gtst speedo out by 10kph

      By -Jimmy- · Posted

      Interesting, I haven't read about the issue with oil getting into the speedo in the cluster before. I'll have to take more notice with mine. The speedo on my R32's when I've run factory diff and tyre size have never been accurate as far as I can remember. The non Type-M GTS-t did come with 15" 5 stud wheels and smaller brakes, but that's less than 5% of them.
    • -Jimmy-
      My R32 Money Pit & The Headaches That Come With It

      By -Jimmy- · Posted

      Good to hear the condenser you picked up off my brother worked all good. Do you think there could be an issue with your AC compressor itself or the clutch on it then? I don't know a lot about them so I can't really help but keen to hear what it ends up being. Keep the build thread going man, it's nice to look back on over time.
    • Lithium
      Shoota's R33 GT-R RB30/26

      By Lithium · Posted

      This is a story of my life things, I learned eventually (thanks to someone calling me out) that my enthusiasm for discussing and sharing ideas that it came across as arrogance and I'm like... WTF?!    One thing I'm pretty sure I justifiably pride myself on is knowing that everyone will have things they can teach you, and you're always going to find out that something you think you know turns out wrong - you just don't know what it is until you get there.   Just the bursting enthusiasm that comes with ADHD when you hit something that gives you dopamine dumps can come across like you think everyone else is wrong or don't matter. But yeah, I'm a software engineer by trade and also do tuning in weekends and 100% have long had a reputation for  quickly making connections when resolving problems or forming solutions that I've sometimes had to take people form a long walk from start to end to explain how I ended up where I did when it's seemed "too simple" when I've stated my initial case, and had the "WTF" type reaction when they've realised how much was actually considered haha.   My reward is that I get all the curly problems thrown at me.
×
×
  • Create New...