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Thread: Turbo Surging at Idle with Exhaust Brake

  1. Top Of Page | #1
    PatrickD's Avatar

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    Turbo Surging at Idle with Exhaust Brake

    My truck just recently started doing this.

    It’s a 2016 fully deleted 5” straight pipe and warp tuned by DRD.

    When I start the truck on cold mornings and turn the exhaust brake on it will spool up like normal but then start to surge.

    There’s no surging when actually using the exhaust brake to slow down. Also does it at high idle.

    It didn’t do it when I first deleted and tuned it.

    Performance wise the truck seems fine, just hate the way it sounds when I’m trying to warm the truck up.

    Any help would be greatly appreciated!


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  3. Top Of Page | #2
    WE WILL STAND! IGOTACUMMINS's Avatar

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    Re: Turbo Surging at Idle with Exhaust Brake

    Let's ask @DRD?

    "The grass is greener where you water it"


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  5. Top Of Page | #3
    DRD's Avatar

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    Re: Turbo Surging at Idle with Exhaust Brake

    Quote Originally Posted by PatrickD View Post
    My truck just recently started doing this.

    It’s a 2016 fully deleted 5” straight pipe and warp tuned by DRD.

    When I start the truck on cold mornings and turn the exhaust brake on it will spool up like normal but then start to surge.

    There’s no surging when actually using the exhaust brake to slow down. Also does it at high idle.

    It didn’t do it when I first deleted and tuned it.

    Performance wise the truck seems fine, just hate the way it sounds when I’m trying to warm the truck up.

    Any help would be greatly appreciated!
    VGTs will do that. Really don't know why.

    Perhaps just positioning errors from wear in the turbo actuator or perhaps poor signal from the back pressure sensor.

    I've even seen brand new untuned trucks do this. Usually it causes no issues in performance.

    Ray,
    Double R Diesel

    The Cummins Whisperer! John 3:16, Romans 10:9-10...Tuning for the Heart and Soul.


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  7. Top Of Page | #4
    PatrickD's Avatar

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    Re: Turbo Surging at Idle with Exhaust Brake

    No known fixes for this though?

    Just stinks because it never did it before and out of nowhere it started doing it and it just makes my truck sound horrible.

    Whistle tune isn’t as fun anymore.


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  9. Top Of Page | #5
    DRD's Avatar

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    Re: Turbo Surging at Idle with Exhaust Brake

    Quote Originally Posted by PatrickD View Post
    No known fixes for this though?

    Just stinks because it never did it before and out of nowhere it started doing it and it just makes my truck sound horrible.

    Whistle tune isn’t as fun anymore.
    No known sure fix.

    Nothing tuning wise I can do to stop it.

    I suppose you could start replacing parts, but that wouldn't be justifiable for the cost.

    Ray,
    Double R Diesel

    The Cummins Whisperer! John 3:16, Romans 10:9-10...Tuning for the Heart and Soul.


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  11. Top Of Page | #6
    Daily Grinding! RamIt's Avatar

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    Re: Turbo Surging at Idle with Exhaust Brake

    @IGOTACUMMINS this should be a sticky.


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    WE WILL STAND! IGOTACUMMINS's Avatar

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    Re: Turbo Surging at Idle with Exhaust Brake

    Quote Originally Posted by RamIt View Post
    @IGOTACUMMINS this should be a sticky.
    DONE!

    "The grass is greener where you water it"


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    BlackBart's Avatar

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    Re: Turbo Surging at Idle with Exhaust Brake

    Quote Originally Posted by PatrickD View Post
    No known fixes for this though?

    Just stinks because it never did it before and out of nowhere it started doing it and it just makes my truck sound horrible.

    Whistle tune isn’t as fun anymore.

    Mine does it too.

    Started doing it after hooking up my tuner.

    It’s always been that one thing you could do to help warm yer horse up a lil bit faster is turn on yer engine brake while setting still.

    Your turbo actuator thingy will close up a little to increase load on the engine, so what I’m kinda suspecting in is that what you’re thinking is a new issue has always been, and with yer straight pipe you got now you can hear what you couldn’t before.

    If I’m right about that, than it can’t be helped.

    Just the nature of newfangled VGT turbos.



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  17. Top Of Page | #9
    PatrickD's Avatar

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    Re: Turbo Surging at Idle with Exhaust Brake

    Unfortunately when I first straight piped it, it never did it.

    Ran it all summer and now that the temps are coming back down and the exhaust brake it kicking on at warm up I noticed it doing it.

    So the issue definitely started happening post tune.

    Whatever it is, hopefully someday someone figures out what is causing it and sheds some light.

    I’d love my truck back to normal!


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  19. Top Of Page | #10
    Daily Grinding! RamIt's Avatar

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    Re: Turbo Surging at Idle with Exhaust Brake

    Quote Originally Posted by PatrickD View Post
    Unfortunately when I first straight piped it, it never did it.

    Ran it all summer and now that the temps are coming back down and the exhaust brake it kicking on at warm up I noticed it doing it.

    So the issue definitely started happening post tune.

    Whatever it is, hopefully someday someone figures out what is causing it and sheds some light.

    I’d love my truck back to normal!
    Every one of these trucks do this at some point in time. Mechanically you have zero issues. Does it make an annoying noise? Absolutely. But that's about it.

    My unproven theory is that the actuator moves the VGT out of range post-tuning; causing the system to attempt to move the nozzle back into range.

    The only way to prove that would be a running data log from stock until the problem occurs.


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