Electronic exhaust valve - exactly how does this function

Discussion in 'Dodge Challenger SRT Hellcat' started by JerseyCat, Oct 18, 2015.

  1. JerseyCat

    JerseyCat Hellcat Member

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    I get the overall concept - valve is opening and closing to permit more or less of an exhaust note, but does anyone know exactly how this is functioning? By "how" I mean is the valve closed 80% by default, 50% in "sport" and fully open in "track". Has anyone seen this functioning out of the car? Myself, I can't seem to hear much difference, but the car only has 250 miles on it and I have not jumped on it due to break in procedure Still, when driving in default and track, I can't seem to tell much difference. Are these valves continually adjusted according to RPM, or are they fixed by "mode" and stay in that position?
     
  2. Confuzed2

    Confuzed2 Silver Member

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    I believe that valve is wide open during two instances at least....during cold start and wide open throttle. My car will wake the neighbors what I first start it in the garage! Pretty sure its position changes other than that is dependant on what mode you're in and throttle position....but exactly where/ what percent open/closed I have no idea,...
     
  3. rayzazoo

    rayzazoo DRIVESRT.COM Gold Supporting Member

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    Best way to hear the difference. Put the RPMs between 3,000-3,500 while driving. If an auto, hold the gear in manual mode.

    Then, switch between Default and Track modes (this mode opens the flaps). You'll hear a difference.
     
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  4. TallCool1

    TallCool1 Gold Member Hellcat Car Club Gold Supporting Member Nat'l Hellcat Tech Advisor HCC Charter Member

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    It's a restrictor, think large washer or donut with hole. Restrictor in (closed) or out (open) not partial.
     
  5. Bandit

    Bandit Gold Member

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    In Track mode they are held open, you'll hear a difference when driving (not at idle or low speeds).

    Forget the break-in BS, it's been proven over and over to be a myth. I've pounded on mine (and ALL of my cars/motorcycles) from the 1st mile without issue. You're not going to really notice much difference is you're pussy-footing it.

    Also after a few thousand miles, the note will get a tad louder (not by much) and a little deeper.
     
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