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Thread: DFCO exit timing - Table b5150

  1. #11
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Thanks for the info..

    I manage a lot of my DFCP by MAP Enable/Disable. So it really only kicks in going down the big hills. Good information though.

    Thanks for sharing!
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  2. #12
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    ah you are COS3? Using map to control triggers is very nice but I got bored messing with things so preferred to use traditional triggers. I know ringram used to run his entire fueling off his VE by using MAP trigger points to adjust fueling for PE mode. Much more accurate and less interference from other elements but required a very accurate table

  3. #13
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    No 'regular' LS1 OS.

    With my cam and altitude I Idle ~45-50 kPa MAP. I adjust my MAP enable to 20 kPa and let it ride to 30 kPa.

    For me, that only activates on moderate declines and with a 10 kPa MAP spread, it holds DFCO 'forever'. Very handy for my day trips.

    Later..
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  4. #14
    Lifetime Member swingtan's Avatar
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    To stop the "popping" on the entry / exit of DFCO, simple set the timing values in {B5149} and {B5150} to something like 10'. The exhaust backfires occur when the timing drops to very low values and unburnt fuel is ejected into the hot exhaust, where is ignites as an uncontrolled burn.

    Simon.

  5. #15
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    might give that a try when the car is back from the garage

  6. #16
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    Well its taken a while Having run with no dfco for the last 9 months I figure it time to try your 5150 settings out!

  7. #17
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    I wanted to add a bit of input here as I have been trying to fix a tune on a 2010 Camaro LS3 with long tubes and fairly open exhaust. The thing crackles and pops very badly upon decel until the DFCO kicks in.

    My fix in the end that is almost perfect was to copy the values in the first column of the low octane timing table {B5102} over 2 {B5149} and {B5150} as both those values are set to VERY retarded timing.

    The car is 100% better and people on the street aren't staring at me any longer from the obnoxious noise.

    Hope this helps someone struggling like me!

    Click image for larger version. 

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