Results 1 to 5 of 5

Thread: DYNCYLAIR_DMA reading low on boosted application

Threaded View

Previous Post Previous Post   Next Post Next Post
  1. #1

    Default DYNCYLAIR_DMA reading low on boosted application

    OK guys,

    My nightmare continues with this 1998 Tahoe that I upgraded the PCM to a 411. Way smoother idle, better throttle response, better HP and torque numbers. I am running COS3 on the Express van OS. It has a 2bar MAP in it, Whipple at 5.5-6.0 psi_g of boost at 6000' elevation, 8.8:1 w/forged internals. She is ready to run with plenty of fuel from the Walbro 255 HP pump and FPR.

    The problem I am having is DYNCYLAIR is the axis the spark table is looking at to map the spark curve. I do not see anything recorded higher than 0.80 at 108kPa and it looks like from the log it is actually reading the 0.40 area of the map. Commanded spark at 0.80 = 21.5*....actual in the log is showing 30* at the same RPM and that is what is commanded in the 0.40 cell at RPM. All of the spark corrections, multipliers, etc have been zero'd or set to 1.0 to try and track why it is doing this and pin-point which cell it is truely getting the commanded spark value from.

    Any insight? I did read Howard's post which was similar to this back in 2006, but there was no real resolution explained or posted from what I read.

    Thanks all!
    -Kenny

    ps...attached is the tune and log file.
    Attached Files Attached Files

Similar Threads

  1. GM.DYNCYLAIR_DMA help.
    By joik307 in forum Gen III V8 Specific
    Replies: 1
    Last Post: August 13th, 2009, 12:16 PM
  2. Whats The Best Package For My Application
    By therock in forum Purchase and Shipping
    Replies: 9
    Last Post: June 18th, 2009, 10:00 AM
  3. DYNCYLAIR_DMA never above 0.50 grams/cyl?
    By S10Wildside in forum General
    Replies: 0
    Last Post: September 7th, 2008, 09:22 AM
  4. Missing PID GM.DYNCYLAIR_DMA
    By ssvolvo in forum General (Petrol, Gas, Ethanol)
    Replies: 5
    Last Post: July 27th, 2008, 03:02 PM
  5. Injector flow rate on boosted application?
    By Lennart in forum General (Petrol, Gas, Ethanol)
    Replies: 4
    Last Post: May 20th, 2007, 07:39 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
  •