Results 1 to 10 of 10

Thread: Turbo car - pulling more timing then commanded. Anyone seen this before?

  1. #1
    Junior Member
    Join Date
    May 2005
    Posts
    38

    Default Turbo car - pulling more timing then commanded. Anyone seen this before?

    Ok, both me an the tuner are stumped here. We are commanding 17* timing and sometimes ending up with 7! As an example @ 5400 and 210kpa my base timing is 27* and subracting 10* at that kpa so I should end up with 17 right? I'm getting 7*. No knock, ECT is not pulling timing, IAT's are not pulling timing. Don't know what's going on with it. We tried turning off the knock sensors, zeroing the iat and ect tables and nothing changes it.

    Here's a run down of the engine
    402ci ls1
    twin turbo
    cos3 3bar
    engine is in a 64 Chevy II

    any Idea's?
    Attached Files Attached Files
    Last edited by LS1Nova; July 20th, 2010 at 08:35 AM.
    64 Chevy II, twin turbo 402 LS1, TH400, Dana 60.


  2. #2
    Lifetime Member ChipsByAl's Avatar
    Join Date
    Feb 2006
    Posts
    617

    Default

    It might not help but I would recommend to log DynCylAir_DMA to accurately show where you are in the spark map.
    Al
    "Trash that carb and get Injected!"

  3. #3
    Junior Member
    Join Date
    May 2005
    Posts
    38

    Default

    I did in some other logs and it was in the far right 1.20 cells
    64 Chevy II, twin turbo 402 LS1, TH400, Dana 60.


  4. #4
    Junior Member
    Join Date
    May 2005
    Posts
    38

    Default

    I'm also baffled as to why the timing is bouncing around so much. It's jumping up and down 3 and 4 degree's throughout the pull.

    Check out this log
    Attached Files Attached Files
    64 Chevy II, twin turbo 402 LS1, TH400, Dana 60.


  5. #5
    Lifetime Member ChipsByAl's Avatar
    Join Date
    Feb 2006
    Posts
    617

    Default

    Maybe log the rest of the DMA and Burst Knock spark retard PIDs (. Make sure you log GM.DYNCYLAIR and not GM.CYLAIR
    "Trash that carb and get Injected!"

  6. #6
    Junior Member
    Join Date
    May 2005
    Posts
    38

    Default

    hmm, should the burst knock be disabled for a fast spooling turbo car?
    64 Chevy II, twin turbo 402 LS1, TH400, Dana 60.


  7. #7
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003
    Posts
    28,403

    Default

    Log the EST_xxx_DMA pids first (before disabling BKR) as Al said.

  8. #8
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003
    Posts
    28,403

    Default

    Frank, can you post your .tun file also, if that's ok...?


  9. #9
    Junior Member
    Join Date
    May 2005
    Posts
    38

    Default

    Thanks for the great advise guys! I'm going to try to get out and log all those pids tonight. Hopefully that will reveal what is going on. Joecar, I added the tune file to the original post.
    64 Chevy II, twin turbo 402 LS1, TH400, Dana 60.


  10. #10
    Junior Member
    Join Date
    May 2005
    Posts
    38

    Default

    Thanks for the help everybody! I finally got it today. Logged some of the dma's and found out it was Burst knock. Pulled 6.8*. Zeroed it out and logged another file and now the timing is solid as a rock and right where it should be.
    Thanks for the help!
    Frank
    64 Chevy II, twin turbo 402 LS1, TH400, Dana 60.


Similar Threads

  1. Car is pulling timing
    By minytrker in forum General (Petrol, Gas, Ethanol)
    Replies: 1
    Last Post: February 27th, 2010, 03:55 AM
  2. Pulling timing for nitrous
    By SRT10KLLR in forum Gen IV V8 Specific
    Replies: 5
    Last Post: November 13th, 2009, 03:52 AM
  3. pulling timing not in program
    By 496chevy in forum Custom Operating Systems
    Replies: 13
    Last Post: November 9th, 2008, 02:03 PM
  4. Pulling timing
    By minytrker in forum General (Petrol, Gas, Ethanol)
    Replies: 10
    Last Post: August 27th, 2006, 05:40 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
  •