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Cylinder Deactivation

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  • Cylinder Deactivation

    The C8 has cylinder deactivation, and I wonder how it sounds. Does the C7 have this? What do you hear behind the wheel?

  • #2
    Its practically imperceptible in my C7. Nice feature.

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    • #3
      By "how it sounds," do you mean the exhaust sound?

      In the C7 (and I believe the C8) there are valves located in front of the mufflers that are generally referred to as AFM valves. When the engine goes into V4 mode, these valves close partially to prevent the engine from sounding like an anemic Honda Civic with a fart can exhaust. This is true even with the non NPP exhaust. It makes the exhaust quite a bit quieter, even if you have the NPP exhaust in track mode.

      Speaking of the NPP, I *think* when the engine goes into V4 mode the NPP valves partially close, too, even if you're in track mode. With the fuse pulled so the NPP valves are always open, V4 mode exhaust sounds terrible.
      SunKissed, my 2015 2LT, 7MT, Black over Daytona Sunrise Orange Metallic, Stingray convertible (One of about 40)

      Purchased 5/2/2015,
      >35,000+ miles

      Proud member of the Old Dominion Corvette Club. Check us out http://www.olddominioncorvetteclub.org

      Never grow up - It's a trap.

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      • #4
        Originally posted by meyerweb View Post
        By "how it sounds," do you mean the exhaust sound?

        In the C7 (and I believe the C8) there are valves located in front of the mufflers that are generally referred to as AFM valves. When the engine goes into V4 mode, these valves close partially to prevent the engine from sounding like an anemic Honda Civic with a fart can exhaust. This is true even with the non NPP exhaust. It makes the exhaust quite a bit quieter, even if you have the NPP exhaust in track mode.

        Speaking of the NPP, I *think* when the engine goes into V4 mode the NPP valves partially close, too, even if you're in track mode. With the fuse pulled so the NPP valves are always open, V4 mode exhaust sounds terrible.
        I was told by the Corvette expert that on the C8 track mode totally disables cylinder deactivation.

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        • #5
          Originally posted by mpgxsvcd View Post

          I was told by the Corvette expert that on the C8 track mode totally disables cylinder deactivation.
          That would be nice. Let's hope it's true.
          SunKissed, my 2015 2LT, 7MT, Black over Daytona Sunrise Orange Metallic, Stingray convertible (One of about 40)

          Purchased 5/2/2015,
          >35,000+ miles

          Proud member of the Old Dominion Corvette Club. Check us out http://www.olddominioncorvetteclub.org

          Never grow up - It's a trap.

          Comment

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