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Thread: Turbo Whistle at Warmup

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    wtnoah333's Avatar

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    Turbo Whistle at Warmup

    I have a 2016 cummins fully deleted with a 5"exhaust MBRP muffler tuned with EFI Live.

    My question is that now in NC the mornings are cold and when I crank it up with the exhaust brake on, I hear the high idle kick on but I do not hear the turbo whistle?

    The exhaust break still works perfectly when I let of the fuel and sounds like a fighting cat LOL but I have no turbo whistle when the truck is warming up.

    Any Thoughts or is this normal?

    Thanks in advance for any input.


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    DDP's Avatar

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    Re: Turbo Whistle at Warmup

    Quote Originally Posted by wtnoah333 View Post
    I have a 2016 cummins fully deleted with a 5"exhaust MBRP muffler tuned with EFI Live.

    My question is that now in NC the mornings are cold and when I crank it up with the exhaust brake on, I hear the high idle kick on but I do not hear the turbo whistle?

    The exhaust break still works perfectly when I let of the fuel and sounds like a fighting cat LOL but I have no turbo whistle when the truck is warming up.

    Any Thoughts or is this normal?

    Thanks in advance for any input.

    Normally it does it when it's cold and disappears when it's warmer outside.

    Try pressing the exhaust brake button when you first start it up and i bet it will come back for a bit.

    I see no reason to suspect anything is wrong.

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    wtnoah333's Avatar

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    Re: Turbo Whistle at Warmup

    Thank you for the reply.

    I am not really worried about there being a problem just more or less wondering why is does not whistle when warming up anymore.

    I did try to press the buttons when I first started the engine but it still did not whistle.


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    #1 VENDOR cumminsdieselfreak's Avatar

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    Re: Turbo Whistle at Warmup

    Quote Originally Posted by wtnoah333 View Post
    Thank you for the reply.

    I am not really worried about there being a problem just more or less wondering why is does not whistle when warming up anymore.

    I did try to press the buttons when I first started the engine but it still did not whistle.
    Welcome from NC!

    The exhaust brake acted weird on my '18 back in October.

    It done the same thing that you're describing, high idle was there but no EB whistle.

    I let the truck get warm before I shut it off and I've not had the problem again.

    Also, my truck is a 6 speed.

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    I WILL STAND! AK Bob's Avatar

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    Re: Turbo Whistle at Warmup

    Quote Originally Posted by wtnoah333 View Post
    Thank you for the reply.

    I am not really worried about there being a problem just more or less wondering why is does not whistle when warming up anymore.

    I did try to press the buttons when I first started the engine but it still did not whistle.
    You could monitor your VGT % actual vs desired.

    Need to be around 96% or greater actual to hear the whistle.


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