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Thread: High pitched turbo noise..

  1. 03-29-2008 06:45 PM #1
    Dejanh
    Dejanh is offline BANNED Senior Board Member Dejanh has a checkered past and should take up chess.
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    Default High pitched turbo noise..

    No check engine lights, no smoke..i just did a dyno on it and everything came out just perfect, they took it apart too they said, nothing!

    Its a very good truck they said, Freightliner in Charlotte that is.

    I was told while in Toledo Freightliner that sometimes the ,,veins'' inside the turbo itself change the tune and start to sing on their own...

    No power loss at all..
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  2. 03-30-2008 04:47 AM #2
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    Kranky
    Kranky is offline Senior Board Member Kranky is on the right path. You could probably safely loan them a quarter.
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    Could be a very slight leak at a clamped connection between the turbo and the intake manifold.

    This would include all the connections at the turbo, CAC, and intake manifold.

    Check the CAC for cracks near the header especially on the hot (turbo) side.

    Could be an intake manifold gasket.

    Also check the air line that feeds the air compressor with turbocharged air.

    I've seen instances where a miniscule leak in any of those places can cause a "whistle" or "whining" sound which rises and falls along with the turbo whine. Not enough of a leak to affect the boost pressure or engine output, but enough to make noise.
    If you can't shift it smoothly, you shouldn't be driving it.
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  3. 03-30-2008 05:20 AM #3
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    countryhorseman
    countryhorseman is offline Senior Board Member countryhorseman is an unknown poster at this point. Don't let him/her around power tools just yet.
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    Possible guess, Series 60 Detroit - FLD or Columbia!

    They all do it! The '06 I drive sounds like a jet fighter at times. Something to do with the Turbo design, wastegate and the emission stuff! Can be quite annoying when trying to sleep.

    Sound asleep, and it winds up for take-off! Ugghhhh! :sad:
    "I discover the principles that work and work them,
    I am forever learning new principles that interaccomodate with what I already know, to the betterment of my life and my world.
    As principles are revealed to me, I cheerfully record them, use them, and share them.
    Principles are, without question, the fastest way to what I want."
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    OOIDA
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  4. 03-30-2008 06:31 AM #4
    Dejanh
    Dejanh is offline BANNED Senior Board Member Dejanh has a checkered past and should take up chess.
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    Quote Originally Posted by countryhorseman
    Possible guess, Series 60 Detroit - FLD or Columbia!

    They all do it! The '06 I drive sounds like a jet fighter at times. Something to do with the Turbo design, wastegate and the emission stuff! Can be quite annoying when trying to sleep.

    Sound asleep, and it winds up for take-off! Ugghhhh! :sad:
    Yeah, its 07 Columbia and everyone has told me that....

    Splitshifter, thank you for your response, ill look into it myself.

    Thanx guys.
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  5. 04-06-2008 07:40 PM #5
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    Bandit102
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    Whistling turbos and long hoods are cool...until bedtime and fueltime.
    1999 FL Classic, N14+ 525 hp, RTLO16-9-13A
    1997 Van's Aircraft RV-6, IO-360
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  6. 04-13-2008 05:09 PM #6
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    Walking Eagle
    Walking Eagle is offline Senior Board Member Walking Eagle is an unknown poster at this point. Don't let him/her around power tools just yet.
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    Just put a Variable Vane turbo on my Cat. If you want noise that SOB will give it ti ya. Riding along it is fine but start wanting real power and you have to wind the windows up or put in ear plugs :sad: Good for running off deer though
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