Does a SC make a blow off "swoosh" sound?

Discussion in 'SRT Hellcat Performance' started by Hemibuck, Mar 8, 2015.

  1. Hemibuck

    Hemibuck Gold Member

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    So I'm more familiar with turbo charged cars than I am SC ones. Does a SC make that "swoosh" sound when you let off the throttle? Just wondering how the pressure is released. Thanks!
     
  2. DrBuick

    DrBuick Gold Member

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    Nope
     
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  3. Hemibuck

    Hemibuck Gold Member

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    Thanks!
     
  4. HellFox

    HellFox Senior Hellcat Member

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    I would imagine the HC is fitted with a re-circulation valve that directs the excess air back to the intake when you let off the throttle. If it does have one I would also imagine that it could be swapped out for a blow off valve to instead vent to atmosphere giving you that swoosh you are looking for.
     
  5. Hemibuck

    Hemibuck Gold Member

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    Well I'm sure as time goes by once these cats have been out for awhile longer there will be little add on's to do. Not sure if I would want the "swoosh" or not. We get that whine which is AMAZING!
     
  6. MoparProud

    MoparProud Silver Member

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    Hellcat has a second throttle body (4 cylinder application) that is normally open and closes when throttle is applied (opposite what a normal throttle body does). When you let off it opens and recirculates air back into the supercharger intake.
     
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  7. CasualObserver

    CasualObserver Senior Hellcat Member

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    If you vented to atmosphere it would make that noise, however being a mass airflow car it would run really rich every time it popped off. Most OEM FI cars use a recirc system to prevent this. If you pull a bunch of air past the mass airflow sensor the ECU will add fuel for said air, then if said air is blown off to atmosphere you have a bunch of extra fuel in the equation. When you are dealing in the aftermarket and are running speed density tuning it is not really an issue.
     
  8. Hemibuck

    Hemibuck Gold Member

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    Good info thanks guys!
     
  9. Mark Hughes

    Mark Hughes Senior Hellcat Member

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    It does make an awesome wrap or bark, out the tailpipes when you let off, though....music to my old ears! LOL!
     
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