Results 1 to 8 of 8

Thread: De-cell Pop

  1. #1
    Active Member NorthAlabamaSpyder's Avatar
    Join Date
    Jun 2017
    Location
    North Alabama
    Posts
    93
    Spyder Garage
    0

    Default De-cell Pop

    2016 F30s with Lamonster cat deleat pipe and big city baffle with factory muffler. Has a pretty bad de-cell pop to it. Is this normal or should I look at a fuel controller or something? Have not checked plugs yet. Thx in advance

    Bruce
    2019 F3-T and some extra stuff

  2. #2
    Active Member
    Join Date
    May 2012
    Location
    Upper Bucks County, PA
    Posts
    53
    Spyder Garage
    0

    Default decel pop

    Popping on decel is a lean condition.
    Last edited by Deputy56; 07-09-2018 at 04:06 PM.

  3. #3
    Very Active Member jwulf74's Avatar
    Join Date
    Jul 2013
    Location
    Piedmont, SD (Black Hills)
    Posts
    761
    Spyder Garage
    0

    Default

    My low cost fix is just applying a super small amount of throttle on decel/braking... keeps the pops down...
    2017 Can Am Commander Limited
    2012 Cadillac CTS-V Black Diamond
    2011 RT-S Viper Red
    2010 RT622 - Black

  4. #4
    Very Active Member KX5062's Avatar
    Join Date
    Aug 2012
    Location
    Central Coast, CA
    Posts
    908
    Spyder Garage
    0

    Default

    A fuel remap is the only sure-fire way to prevent the popping you are experiencing, given your current configuration. However, you could try a total BUDS reset and let the system relearn the fuel mapping. That's not certain, because a lot of motorcycles computer systems are preset at the factory to operate with the factory intake and exhaust configurations and can only make small adjustments for altitude and ambient temperature. Thank you EPA.
    2014 RT SE6

    Previously 2008 GS SM5



  5. #5
    Very Active Member PMK's Avatar
    Join Date
    Jan 2014
    Location
    SoFlo
    Posts
    2,441
    Spyder Garage
    0

    Default

    Decell pops in the modern fuel injected engine are not truly indications of lean condition.

    Granted, the exhaust leak is always a possibility so I won't discuss that.

    The modern fuel injected engine is loaded with sensors and is expected to obtain efficiency. One method to reduce fuel consumption is to have the computer sense a closed throttle, and with that, if the engine is being overdriven by the rear tire, no fuel is needed to sustain the engine to keep it running. As the machine slows down, the overrunning also slows. As the computer senses the engine will stall, it begins to add slight amounts of fuel to sustain it. Often, these blips of fuel, are ignited but also sent into the exhaust system, giving that pop sound. Chances are, if you reinstall the cat, the symptom still exists, however the added baffling will subdue the sound.

    The person that mentioned add a slight amount of throttle, yes that works, since the computer is not seeing a closed throttle and is being told to rev the engine up.

  6. #6
    Very Active Member bruiser's Avatar
    Join Date
    Sep 2010
    Location
    Eastern North Carolina
    Posts
    6,601
    Spyder Garage
    0

    Default

    Quote Originally Posted by NorthAlabamaSpyder View Post
    2016 F30s with Lamonster cat deleat pipe and big city baffle with factory muffler. Has a pretty bad de-cell pop to it. Is this normal or should I look at a fuel controller or something? Have not checked plugs yet. Thx in advance

    Bruce
    Did you do the 15 minute run in when you added the cat delete? The 1330 does have a tendency to pop on decel with the cat delete since it has less backpressure.



    USAF '69-'89 E7
    Thailand/Vietnam 1972
    Member: Royal Order of Rat Bastards







  7. #7
    Very Active Member DGoebel's Avatar
    Join Date
    Oct 2016
    Location
    Faribault, MN
    Posts
    1,843
    Spyder Garage
    1

    Default

    Quote Originally Posted by jwulf74 View Post
    My low cost fix is just applying a super small amount of throttle on decel/braking... keeps the pops down...
    Thanks JWulf, ever since you posted this (in this thread or a different one I can't recall) I've been successfully applying your technique and have quit looking for a 998 V-twin baffle. It works great!
    Safe Rides,
    David and Sharon Goebel
    Both Retired USAF Veterans
    2013 RT Limited, Pearl White
    Farkles too numerous to list
    See my Spyder Garage
    IBA 70020

  8. #8
    Very Active Member PMK's Avatar
    Join Date
    Jan 2014
    Location
    SoFlo
    Posts
    2,441
    Spyder Garage
    0

    Default

    Quote Originally Posted by DGoebel View Post
    Thanks JWulf, ever since you posted this (in this thread or a different one I can't recall) I've been successfully applying your technique and have quit looking for a 998 V-twin baffle. It works great!
    Exactly, the engine is not having the fuel flow at 0.0 during throttle off decell. By keeping a slight amount of throttle applied, the computer does not go from zero fuel to blips of fuel to keep it running. With a partial throttle, you are commanding the engine to run above idle during decell.

    Other than noise, the pops essentially are harmless to the engine or machine.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •