Jump to content
SAU Community

Stock ECU Misbehaving?

Ska

By Ska,
in General Maintenance

 Share

Recommended Posts

Ska Grand Master

Ska

Posted
Posted

OK I own what is in my sig.

So when I first bought the car, previous owner told me speed cut kicked in at 180kms and would not go past it, to which i have proven him wrong, on a dyno of course, got up to 193 kms before the guy running the car on the dyno backed off.

So had someone check out my ECU and he said it looked as stock as it can get.

So I went out on a private road and took it too the limit, and funnily enough I do hit a limiter I think, it tries to go, but something just hold it back, this is when the speed needle is pointing just past straigh down.

Also today noticed that sometimes I can pass the rev limiter, scared me as I usually use that as a shift guide, thought I was going a bit fast for a certain gear, looked down and WHOA 8500 rpm, but then got back to that level and hit the limiter, this seems to be sporatic and cant reproduce instantly, but it does happen and it does worry me.

So I do have a totally intact stock ECU and only the mods listed below, so why should/could the stock ECU play up like this?

Thanks!

Link to comment
https://www.sau.com.au/forums/topic/46232-stock-ecu-misbehaving/
Share on other sites
Craved Grand Master

Craved

Posted
Posted

that is definately a wierd one, unless the ECU has been chipped! but redline is 7000rpm and speed cust should come in just past 180km/h

any stickers on the ecu? any things plugged into ecu, my SLD is stuck to the back of the ECU!

predator Grand Master

predator

Posted
Posted

I've seen a few that kick past the redline a bit.. I believe it is due to the type of exhaust and a few other things. If its in neutral and you redline it (which isn't too good for the engine apparently) that is when it can do it more.

The speed cut of 180km/hr is fairly rough. .some have reported going up to 200km/hr before it cuts out the injectors. There may be some inaccuracy of what the speed the ECU is picking up and that displayed on the speedo too. Even if its only 5% at 180km/hr its going to be a bit over 180km/hr.

I wouldn't worry at all to be honest!

strutto Grand Master

strutto

Posted
Posted
I've seen a few that kick past the redline a bit.. I believe it is due to the type of exhaust and a few other things. If its in neutral and you redline it (which isn't too good for the engine apparently) that is when it can do it more.

The speed cut of 180km/hr is fairly rough. .some have reported going up to 200km/hr before it cuts out the injectors. There may be some inaccuracy of what the speed the ECU is picking up and that displayed on the speedo too. Even if its only 5% at 180km/hr its going to be a bit over 180km/hr.

I wouldn't worry at all to be honest!

:)

Ska Grand Master

Ska

Posted
  • Author
Posted

Alrighty then, firstly thanks to all for the suggestions, I unbolted my ecu and took a look at it, nope no stickers other than nissan ones.

Yeah the speed cut does not really worry me, it is the ROM limiter that does, seem to get it to do it very often in neutral by free revving the guts outta it, but also happens rarely under load, in gear, so just have to watch it when I do give it a bit :D

Ska Grand Master

Ska

Posted
  • Author
Posted

Yeah, positive, did not stop there either, it just sailed past then I looked up to concentrate on the road, and whacked it into neutral as fast as I could, when I looked back down, it was just coming down past 6,500, scared the living crap outta me! Thoughts were, "Oh crap what have I broken now!" :D

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

    • Murray_Calavera
      Steps to DIY sanding car back ready for respray....

      By Murray_Calavera · Posted

      Oh dear. The panel beating needs to be done before the filler work. Do you have a photo of the dent before you started? Hard enough to not flex and only hit the high spots?  What do you mean it was just temporary? 
    • Manur33
      Vag Coil Diy loom wire guage selection

      By Manur33 · Posted

      Can u check this way it works for power supply?
    • Manur33
      Vag Coil Diy loom wire guage selection

      By Manur33 · Posted

      These coils draw 10amps that what i read online
    • nouveau_poor
      Unknown sound similar to BOV on positive boost with partial throttle RB26

      By nouveau_poor · Posted

      I appreciate the detailed explanation, think I understand now. I spent the better part of last night reading what I could about shuffle and potential solutions. I had replaced the OEM twin turbo pipe with an alternate Y pipe that is separated further away from the turbo. The current one is from HKS and I had a previous pipe that was separated even further away, both have shuffle. I had heard that a divider can be welded in to the OEM pipe to remove turbulence, and figure that aftermarket pipes that are more separated would achieve the same thing. From what I read, most people with -10 turbos get shuffle due to their size, though it's a bit less common with -5s on a standard RB26. I think Nismoid mentioned somewhere it's because OEM recirculation piping is common in Australia with -5 cars. It seems that the recommendation tends to vary between a few options, which I've ordered in what I think is most feasible for me:  1. Retune the MAP or boost controller to try to eliminate shuffle 2. Install OEM recirculation piping 3. Something called a 'balance pipe' welded onto the exhaust manifolds. I don't know if kits for this are available, seems like pure fabrication work 4. simply go single turbo My current layout is as follows: Garrett 2860 -5s HKS Racing Suction intake MAF delete pipes HKS racing chamber intake piping hard intercooler piping,  ARC intercooler HKS SSQV BOV and pipe Haltech 2500 elite ECU and boost solenoid/controller HPI dump pipes OEM exhaust manifolds HKS VCAM step 1 and supporting head modifications Built 2.6 bottom end All OEM recirculation piping was removed, relevant areas sealed off I'll keep an eye out for any alternative solutions but can get started with this.  Only other question is, does shuffle harm the turbo (or anything else)? It seems like some people say your turbo shafts will explode because of the opposing forces after a while and others say they just live with it and adjust their pedal foot accordingly. 
    • codygrimm27
      Can you mount the ATTESA pump in other locations?

      By codygrimm27 · Posted

      That worked out PERFECTLY! Thank you big time to JJ. He was able to swap me his stock diff. He drove all the way to me as well. Killer! Removal & install was pretty straightforward. The diff itself is HEAVY. So that’s a 2 man job.  Man does the car drive nice now! Couldn’t have worked out any better 👌
×
×
  • Create New...