Jump to content
SAU Community

Powerloss & Pinging :(

MSPEC

By MSPEC,
in Engines & Forced Induction

 Share

Recommended Posts

MSPEC Mentor

MSPEC

Posted
Posted

Okay about six months ago before I used the wrong fuel and detonated my engine I was making 223rwkws (the engine had just been rebuilt, don’t just 8000ks). Since then the engine has been repaired again replacing two pistons and all the rings. After running it in I changed the oil and headed down to Race Pace with Mobil 8000 in the car. After Ben made the necessary adjustments the car put out just 203rwkws. Ben played around for quite some time and couldn’t get the car to match its previous 223rwkw run. The 20rwkw loss is unexplainable since nothing in the car has really changed.

The performance loss is not really the issue though. For some reason the engine was pinging on the dyno, Ben fixed this but whenever I boot it now the “Check” light goes off flashing. Basically the car is still ever so slightly pinging :mad: Any ideas on why the car might be making less power and why a well turned engine with good fuel oil and so on would be pinging?

Link to comment
https://www.sau.com.au/forums/topic/39240-powerloss-pinging/
Share on other sites
Steve Grand Master

Steve

Posted
Posted

well, there are alot of different things that can cause detonation and powerloss.

BOV leaking or leak in one of the intercooler pipes and vacuum lines is the first place I would be looking.

Then you could check the injectors are flowing ok, if you have an adjustable fuel pressure reg, is the pressure the right - its easy for someone to accidentally fark with shit when its sitting on a work bench.

A couple of places that may be worth looking at anyways - alot of stuff can happen to an engine when it is pulled apart.

Link to comment
https://www.sau.com.au/forums/topic/39240-powerloss-pinging/#findComment-797378
Share on other sites
MSPEC Mentor

MSPEC

Posted
  • Author
Posted

Thanx for the time guys, took it to Ben today and he fixed it ... think it was mostly a dodgy knock sensor. Anyway, the car runs better and safer now. Cant really tell you what he did, just used some of that magic of his!

Link to comment
https://www.sau.com.au/forums/topic/39240-powerloss-pinging/#findComment-798350
Share on other sites

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

    • fatz
      Neil's R33 Gts-t Build

      By fatz · Posted

      Give it 40psi and send it to the moon
    • GTSBoy
      R32 GTS (RB20DE) Injectors Replacement

      By GTSBoy · Posted

      I suspect 550s are on the large side for happy operation with a stock/Nistune RB20 ECU. The Hitachi ECU doesn't love short pulse width operation, and the RB20 doesn't need much fuel at idle. Big injectors can be unpleasant. This could be contributing.
    • joshuaho96
      R32 GTS (RB20DE) Injectors Replacement

      By joshuaho96 · Posted

      Yeah, I still don't know why the idle speed control can't catch the falling RPMs. In the Consult logs I see the AAC duty cycle rising, but suddenly it goes lean and the engine stalls. Anyways, the relevance here is the DW 550cc injectors are probably the same. So if OP has similar issues I would be tempted to finger those injectors as problematic for whatever reason vs the ECU failing for some reason.
    • GTSBoy
      R32 GTS (RB20DE) Injectors Replacement

      By GTSBoy · Posted

      Yeah, sort of blurring two different things together, aren't we? I just meant O2 feedback closed loop. I used to have a 0-1V LCD meter on my dash, wired directly to the O2 sensor signal. So you could easily see what it was doing. Normal running it would flick back and forth nicely. Slow down to an idle and it would keep flicking, as the ECU tried to servo to maintain stoich, but it would slow down as each swing happened until it would stay at one end of the scale. As I said above, the sensor heater is not enough to keep it hot enough when there is also little heat in the exhaust flow. Give it a blip and it would start swinging again, then peter out again. Meanwhile, idle speed control would run just fine, because unrelated.
    • joshuaho96
      R32 GTS (RB20DE) Injectors Replacement

      By joshuaho96 · Posted

      It's not even O2 feedback, it's just simply when the ECU sees the closed TPS signal for whatever reason the idle will start steadily dropping until the engine dies. With the TPS adjusted to not trigger closed TPS it will idle at some ridiculously high RPM and something like 6 degrees of timing. In the absence of getting eyes on it personally and a lot of quality time doing diagnostics I couldn't tell you what the real problem was but it was interesting nonetheless
×
×
  • Create New...