Jump to content
SAU Community

Car Sounds Like A Wrx ... How Do I Stop This?

PSIKO

By PSIKO,
in Engines & Forced Induction

 Share

Recommended Posts

PSIKO Mentor

PSIKO

Posted
Posted

Hey guys,

Earlier tonight my car (which had been driving absolutely perfectly) all of a sudden started running like absolute crap, and what I can best describe as sounding like a WRX.

I limped the car home (50kms, sigh), and it seemed to only do it once the car had come up to temperature from that point on.

I am not sure whether it is the fuel filter, I haven't really changed it since I swapped to e85, though in saying that I haven't had much of a chance to drive it much

Modifications which would have an impact are:

  • RB26DETT
  • ViPec ECU running MAP
  • Running on e85
  • New spark plugs within the last couple of weeks
  • -5 turbos, full aftermarket exhaust
  • Splitfire coils (probably less than 1,000km's on them)
  • Metal headgasket with ARP headstuds freshly put in within last week or so

I've only just had it put together, and was dyno'd last week and was fine there

A mate noticed when I pulled out of the car park he thought he saw a puff of smoke but couldn't see what colour it was but thought it might be white (with nothing else after that initial small puff), perhaps ethanol perhaps something else?

A niggly problem that I have with the car is the electrics - there's a circuit breaker (180 amps or something large) which seems to sometimes prevent me from starting the car up (this happened tonight too) - could this have an impact, as there's not enough voltage going to coils or anything like that?

If anyone could suggest anything, that would be greatly appreciated.

Of course I'll be contacting the tuner, but just to get some initial ideas in case it's something easy like a fuel filter (which I will also be replacing)

Cheers!

iruvyouskyrine Grand Master

iruvyouskyrine

Posted
Posted

Running on 5 cylinders. Did you wash the car recently? Most common issue is water sitting in around the coilpacks, or your coilpacks could be on the way out.

Leave the car running rough and disconnect each coil pack one at a time until you hear no difference in sound. That's the dud one.

Sinista32 Grand Master

Sinista32

Posted
Posted

Agree with running on 5 Cylinders

Could be anything that's associated with stopping that cylinder from firing or firing at the correct time

process of elimination starting with the method above

PSIKO Mentor

PSIKO

Posted
  • Author
Posted

Cheers for the replies guys,

Yep car has been washed recently - however is it odd that it would suddenly start doing it, and across the full rev range, if it was from water from a recent wash?

Will test the cylinders this weekend as you both suggested

Badgaz - doubt it's intercooler as it's not running MAFs, cheers though

Thanks fellas

Blackkers Experienced

Blackkers

Posted
Posted

I dropped an injector once and it ran on 5 cylinders. Sounded like a wrx too, rough when driving and idling. But on deceleration the engine felt smooth again. So in gear above ~2k rpm with 0% throttle the engine felt smooth. That's how I knew it wasn't an internal engine issue

Maybe give that a go if you're worried. I suspect coilpacks or plugs

iruvyouskyrine Grand Master

iruvyouskyrine

Posted
Posted

You wouldn't believe how many times I have seen this after people was their car. But yeah pulling the clips off the coilpacks and injectors progressively is an easy and almost guaranteed way of fault finding the problem.

Good luck :)

Badgaz Experienced

Badgaz

Posted
Posted

Cheers for the replies guys,

Badgaz - doubt it's intercooler as it's not running MAFs, cheers though

Thanks fellas

So your map sensor, iat sensor and tps are reading correct? Can you data log on your ecu?

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
      "Cheap" bolt on turbo on RB25DET NEO

      By Murray_Calavera · Posted

      The fab work can be as simple as a couple of silicon hoses and clamps to the factory piping. 
    • joshuaho96
      "Cheap" bolt on turbo on RB25DET NEO

      By joshuaho96 · Posted

      Just sounds like either way you need to do some fab work to get everything to fit, so why limit yourself at that point? If the GCG high flow option is zero effort in and out swap though I'd probably do that. It's almost certainly lowest risk, lowest cost, etc. The HKS GTIII-RS option that Kapr mentioned is laughably expensive for what it is, they charge the exact same for two turbos on the RB26 so their margins are off the charts on that thing.
    • GTSBoy
      "Cheap" bolt on turbo on RB25DET NEO

      By GTSBoy · Posted

      Intake manifold is not a part of the issue. The turbo bolts to the exhaust manifold. That is easy. But close your eyes and picture the physical situation. That is a T3 flange on the manifold and a T3 flange on the turbo. As long as any new turbo has a T3 flange on the exhaust housing, that exhaust housing will bolt to the exhaust manifold. This places the exhaust housing in the same place as the stock one. But now move your mental attention a little further forward. The location of the compressor housing is set by the length of the turbo's core. The stock turbo had a long core. Let's say that it is..... 100mm long. So that would place the compressor housing 100mm forward of the exhaust housing. But a highflow, might well have a centre core that is shorter. Let's say that it is only 70mm long. Now the compressor housing will be 30mm further back in the engine bay than the stock one. This DOES move the turbo's compressor outlet backwards. It also moves the compressor's inlet backwards. You will very likely have to do some work to both the inlet and outlet piping to make everything connect again. I am not say this to make it out to be a bigger deal than it is. I am just pointing out that "bolt on" is sometimes not quite bolt on. The highflow from GCG that Murray linked above (https://gcg.com.au/turbo-charger-upgrade-skyline-gtst-2iu-xtrgts-s1.html ) uses a core that is the same length as the stock core, and so does not require this extra work. It will look very much like the stock turbo. No-one uses GTR turbos of any flavour (stock, or aftermarket) in a single turbo application on RB20/25. It's not a thing. Yes, people have been putting on GT3076, GTX3076 (and bigger and smaller versions of those) and G30s (of various sizes) onto RB20/25 since forever. But these are not "bolt on". Everything except the 4 bolts to the exhaust manifold change with these. And genuine Garretts are expensive. Non-gen, like Pulsar, etc, are cheaper, variously as good or nearly as good. But still not bolt on. No-one in the right mind would pay for an HKS turbo. Not in this modern day and age. Well, yes, the GCG highflow. You could ask HG what he can do to make the compressor housing sit in the original location. There are surely others doing highflows around the world. And some of the eBay/Temu ones (as reported by Dose) work and don't die. Bit of a lottery though. I would send your turbo to GCG (here in Oz) to be highflowed if you want a trivial no-extra-work option. But seriously, the work required to change inlet and outlet piping is not that hard. That's a boost control problem, not a turbo problem.
    • Kapr
      "Cheap" bolt on turbo on RB25DET NEO

      By Kapr · Posted

      Thank you all for the replys 🙂 I know that intake would be different but that is one pipe at it is not that hard to get(custom one). I meant mainly bolt to the stock manifold and the turbo elbow. I looked and many sites/forums but they are just "old" with some old HKS turbos from GT-R i guess? What about some Garrets?  Or any other turbo? Is there even a turbo which i can just bolt on? 😄 And yeah i know about that new HKS but that is like 2000k USD without taxes/shipping in here   Iam getting a touch up tune but my "problem" is that on the "not" hot day iam getting peaks around 0,9 bar...and when it was around 15 Celsious i saw peak around 1 bar which is just too much for stock turbo. And of course turbo is old and i like to get some new one for a piece of mind 🙂 
    • GTSBoy
      new here

      By GTSBoy · Posted

      I'm working on the assumption that our friend Jasmine here is a Russian (or, possibly Ukrainian) spammer/spambot, based purely on the number of such that I have been having to neuter in the last few weeks. IP address for the OP above was in WA. But that could have been via VPN. Posting at quarter to 4 in the morning is a good sign of being from somewhere in Europe. The last Jasmine that I kicked in the cooch was IP addressed in Ukraine. Even that could have been via VPN, and the bitchbot could have been from Russia, Serbia, China or anywhere. Regardless, was a spambot, so I killed it with fire. The fact that our new friend Jasmine here did not respond in any way to my tart query strongly suggests to me that this OP was just the establishment phase of a user able to be activated for spamming in a week, or 3 or 10.
×
×
  • Create New...