Crazy Loud Turbo Whistle!

Discussion in 'Peterbilt Forum' started by Jdsmoker, Mar 30, 2021.

  1. Jdsmoker

    Jdsmoker Bobtail Member

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    New to the forum.... My son bought a Pete with a C-15 6nz. Pulling a grain wagon. He has been complaining about a super loud whistle coming from the turbo. It starts around 15 psi boost and is obnoxiously loud thru about 20 to 25 psi boost. (I've driven the truck and can vouch for it) We've had it in a 2 reputable diesel shops and they have gone over it with a fine tooth comb looking for air leaks. We finally had the exhaust totally resealed to try and make sure. Still no luck. My son has read online about maybe sticking a silencer ring before the turbo??? I guess it is done on pickups sometimes??? We are out of ideas and getting a little frustrated. Any thoughts?

    Thanks!
     
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  3. wore out

    wore out Numbered Classic

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    CHASIN THE DEVIL'S HERD
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    Check the clean air side, usually middle of the y over the valve cover you will find a hole
     
    baha Thanks this.
  4. Roberts450

    Roberts450 Road Train Member

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    Sounds like a perfectly fine cat turbo to me. My 2ws is the same way.
     
    Bean Jr. Thanks this.
  5. Jdsmoker

    Jdsmoker Bobtail Member

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    I know their will be noise.... But this is CRAZY Loud! It is incredibly piercing. Loud enough that you would need ear plugs. If the noise was at a point in the boost that it wasn't their very long, a guy could handle it. But it is right in that 15 - 20 psi range and that is where it sits a lot going down the road.
     
    Trucker61016 Thanks this.
  6. Roberts450

    Roberts450 Road Train Member

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    Have you driven trucks with cats before?
     
    Bean Jr. Thanks this.
  7. Capacity

    Capacity Heavy Load Member

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    Bearings maybe , check for air leaks.
    Best way to tell is put it on the Dyno.
     
    Magoo1968 Thanks this.
  8. Jdsmoker

    Jdsmoker Bobtail Member

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    Yes I have.
     
  9. Bean Jr.

    Bean Jr. Road Train Member

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    That's what the 1693 sounded like. Crack the throttle, no engine noise, only turbo.

    That's what I'm talking bout!
     
    Trucker61016 Thanks this.
  10. Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    And the rattling marbles sound too.
     
    Bean Jr. Thanks this.
  11. Don379

    Don379 Medium Load Member

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    Complaining about cat turbo whistle? I’ll bet you can swap out that c15 for an emissions motor. That might be right up your alley bud
     
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