Results 1 to 7 of 7

Thread: Killing Defuel?

  1. #1
    Lifetime Member Cougar281's Avatar
    Join Date
    Jan 2006
    Posts
    834

    Default Killing Defuel?

    With PPE announcing non-defueld shifts, and people reporting that the Allison shifts better this way (or seems to), I'm curious: How do you do it? I was told that the defuel comes from the base torque and torque based fuel tables (A1210 & A1109 respectively for DSP1, B1103-B1105 & B0742-B0744 for the main tables, I assume). I set A1109 to 110mm3, and discoverd that that's actually the amount of fuel the ECM is going to command to be dumped in (my fuel rates went way up for about 1/4 second). Obviously, I mis-understood something. What table(s) woult I need to change and how to kill defuel?

    Thanks

  2. #2
    Lifetime Member
    Join Date
    Mar 2007
    Posts
    203

    Default

    UMM I would make sure you have a built tranny before getting rid of defuel. Torque limited injection quanitity is the table.

  3. #3
    Lifetime Member Cougar281's Avatar
    Join Date
    Jan 2006
    Posts
    834

    Default

    No worries there... Done a while ago

  4. #4
    Lifetime Member IdahoRob's Avatar
    Join Date
    Apr 2006
    Posts
    736

    Default

    Cougar, many tables contribute to no, or some amount, of defuel. Need to look at the tcm shift tables, torque based table, and fuel main rate table, and make them all work together.

    The tranny does shift really well under full power without defuel except 5th then some is needed.
    2013 LML, 550hp with factory emissions, stock cp4 and compound turbos.
    2002 LBZ, 4x4 (Max'd Out) 6000lbs 9.36 @ 154 mph NHRDA Champion and Record holder
    1965 El Camino, duramax 9.6 @ 149MPH

    All EFI tuned by Adrenaline Truck Performance

  5. #5
    Lifetime Member
    Join Date
    Jan 2006
    Posts
    379

    Default

    Rob, I wonder how long these Alli's are going to take shifting without any defueling? It would be nice if they take the spankin and ask for more but I'm just curious.

  6. #6
    Lifetime Member IdahoRob's Avatar
    Join Date
    Apr 2006
    Posts
    736

    Default

    My LLY tuning had no defuel at the drag strip on all shifts except 4-5. Worked great all season long. My LBZ needs a little bit on certain shifts. Both runnning 12.0's
    2013 LML, 550hp with factory emissions, stock cp4 and compound turbos.
    2002 LBZ, 4x4 (Max'd Out) 6000lbs 9.36 @ 154 mph NHRDA Champion and Record holder
    1965 El Camino, duramax 9.6 @ 149MPH

    All EFI tuned by Adrenaline Truck Performance

  7. #7
    Member
    Join Date
    May 2007
    Posts
    96

    Default

    My LBZ shifts hard sometimes in 3rd and 5th.

    Are those the shifts you are talking about Rob??

    I really don't like my 5th gear shift-it kind of scares me sometimes.. It just doesn't feel right!
    '07 LBZ Classic, BW S464 Turbo, EGR deleted, 3" IC piping, Trans-go, ATS 5-star converter, stock clutches

Similar Threads

  1. Defuel affect
    By SGFastMax in forum Duramax LB7
    Replies: 4
    Last Post: May 5th, 2010, 11:59 AM
  2. EFI Connection...you're killing me!
    By DURAtotheMAX in forum Conversions / Aftermarket Parts
    Replies: 3
    Last Post: February 4th, 2010, 02:31 AM
  3. BBL killing widebands??????
    By Wasted Income in forum FlashScan V2
    Replies: 12
    Last Post: September 17th, 2009, 10:26 PM
  4. LMM defuel
    By lawnboy01 in forum Duramax 06 LLY / 06+ LBZ & LMM
    Replies: 3
    Last Post: August 30th, 2009, 12:16 AM
  5. defuel question
    By saltflat in forum Duramax 06 LLY / 06+ LBZ & LMM
    Replies: 1
    Last Post: June 2nd, 2009, 06:41 AM

Posting Permissions

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