Listen To The Incredible Exhaust Note Of The New Dodge Challenger SRT Demon

Dodge knows that developing a drag-tuned muscle car would be nothing without a proper sound, which is why they fitted the Challenger SRT Demon with an advanced torque reserve launch system.

Revealed in the latest teaser of the vehicle, the “advanced torque reserve launch system” is another first for a production car, contributing to the decibels and the deep tone produced by the exhaust system.

But what exactly is ‘torque reserve’? Well, according to Dodge, the system allows more airflow through the engine before launch, increasing supercharger rpm without torque overwhelming the brakes and spinning the tires.

It kicks in when the Demon’s Launch Mode is active and the powertrain’s rpm are over 1,000, and does two things: it closes the bypass valve on the supercharger, and manages fuel flow to cylinders and alters spark timing.

With torque reserve managing the engine output, the supercharged HEMI engine can build boost pressure before leaving the starting line and reach maximum boost pressure quicker, taking full advantage of the SRT Demon’s increased weight transfer and increased contact patch drag radials to reduce 60-foot times“, Dodge writes.

As usual, the automaker has dropped yet another Easter Egg in the latest installment of the teasing campaign, in the form of a rear license plate that writes “3.9+221=405”. In Dodge math, this could mean just about anything, and until we learn some official output and performance numbers, your guess is as good as ours as to what this means.



  • JD

    3.9 is the acceleration from 0 to 60, I guess.
    221 may be the exit speed at 1/4 mile
    405 may be the number of a special edition

    • Craig

      The thing is…. the Hellcat already gets to 60 in 3.7 seconds and its 1/4 mile exit speed is 226 mph. [On street legal drag radials] But I suppose Dodge could be playing it safe numbers wise. As for 405 …. click on the link. Who knows!!

    • Mac

      Hey JD, might want to rethink that 0-60 time. The Hellcat already has a 0-60 time of 3.6, why would the Demon be slower. Just sayin’ . . . .

    • Kaisuke971

      It was already written 3.0s on the charts for the 0 to 60 in the last video.

  • Six_Tymes

    it does sound great. with all the hype surrounding this, it better keep the power down, but how? will the slicks be enough?

  • Kaisuke971

    People are gonna be massively disappointed with this car. Dodge is hyping it up too much, and the public is starting to expect things that don’t even make sense. I’ve seen people suggesting that 3.9s is the 0-100mph time…

    For reference, an F1 car does it in about 4s flat.

    • brn

      Enthusiasts will be disappointed. The public hasn’t noticed.

  • Craig

    Just as it takes off – I hear 4 chirps. AWD maybe?!

  • Elite59

    Just a guess, like everyone else: 3.9 liter motor (6 cyl), cylinder head Intake valve size is 221, and it produces 405 HP. I know everyone is speculating on a high HP V8, but what if it is an all wheel drive 6 cylinder, with the special traction control, it could launch out of the hole like a jack rabbit and run a very respectable 1/4 mile time.

  • Karl

    Let’s see,how many ways can lipstick be applied on a pig! Instead of coming with a new generation of modern lighter cars FCA insists on playing catch up and the clown. How old is the current model again? Sad,real pathetic indeed. R.I.P FCA💀

    • Six Thousand Times

      2009 technically but on a 1990s M-B platform.

      • Karl

        That’s damn sad to say the least!

        • Six Thousand Times

          And that Hellcat engine has a cast-iron block.

          • Karl

            Time for a all new model!

          • steve

            If they can keep selling them in good numbers, FCA is winning. The amortization of R&D of a vehicle is amazing after 8 years with only minor changes… They are making a fortune on this car…

          • Karl

            Time to replace the archaic fat pig!

  • Adam Coats

    There is no way that 221 is the trap speed for the 1/4 mile. That is not even in the realm of street cars or lightly modified drag cars. I assume it could be the top speed, but that seems quite high for something that does not have the best drag coefficient.

  • Obsequious Lickspittle

    Proper farty sounding just above idle.

  • Axel Cortez

    0-100 km/h 3.9 trap speed in km/h 221 and 405meters

    0-60 should be lower than 3.9
    221km/h is 137mph
    405m is a quarter of a mile

    • Creepy.Joe.Biden

      You may have figured it out, but the 3.9 doesn’t make sense.

  • Donald neizer

    3.9 is the size of the supercharger- 221 is how much hp it is above the hellcat- and 405 cubic inches

  • John Caprai

    I agree with Donald neizer… 3.9 Liter SC, top Speed is 221, or where you will not get above 3.9 Mph is the 405 in So Cal… 🙂

  • Six Thousand Times

    I understand that it’s pretty much just an even bigger supercharger. Something like 2.6 litres. Cheap tech for FCA.

  • Big Black Duck

    my favorite exhaust notes belonged the Vulcan and LFA and now this

  • ChrisInIL
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