Heavy Equipment Forums Heavy Equipment Community

C15 MXS

Robert Dickens ยท 2025-12-12 09:48

Good morning. I have a c15 mxs that the driver says makes a chuffing noise when applying throttle at around 1400 rpm with a good size load. Says sounds like waste gate blowing off and EGT climbs . Its been converted to a single turbo , with a 16:1 compression. Its brand new head, pistons etc. Any ideas

Replies6
  1. #1pushbroom2025-12-12 17:20

    IVAS still present? Are they set or backed off?

  2. #2Shimmy12025-12-12 19:28

    Wastegate blowing off would make a sound in the exhaust, if that were possible. Wastegate only relieves exhaust pressure on the front side of turbine. What is the boost doing? It isn't a misfire, is it?

  3. #3Truck Shop2025-12-12 21:33

    Has it done this since it was converted or a issue that just started?

  4. #4Robert Dickens2025-12-13 11:53

    I'm told boost is at 40 psi. Its a new issue. What would cause misfire

  5. #5Robert Dickens2025-12-13 11:54

    IVA'S are backed off

  6. #6Truck Shop2025-12-13 14:16

    Imo--would check turbo first--because both the noise and high egt can possibly be related to turbo.