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Thread: How mcuh should be A/F between shifts ?

  1. #1
    Lifetime Member wesam's Avatar
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    Default How mcuh should be A/F between shifts ?

    I want to know how much the A/F should be between shift ( when shifting in M6 car at 6800 rpm there is a short period of time the map goes to 15-20 kpa )
    i want to know how much A/F should be in this area is it 12.8 like wot or is it 14.6 like cruise ?
    EFILive Tuner

  2. #2
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    wesam:

    I keep M6 DFCO Enabled, so my AFR briefly goes to ~20.9 AFR during WOT shifts.

    If you are doing AUTOVE that is a tremendous Throttle Transient that should be filtered out.

    I think it is nearly impossible to tune that area anyway. Without M6 DFCO Enabled, Fuel Dynamics (Wall-Wetting, Evaporation, etc) may ultimately determine the actual AFR. It may actually go richer as you let off the throttle, then briefly lean as you stomp.

    Bottom line is I believe it is virtually impossible to 'tune'. I have been running M6 DFCO for over 30K, with no WOT problems. In essence you may not need any injector flow during a shift.

    Or you trying to tune that area, or is this more of a hypothetical question?
    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..


  3. #3
    Lifetime Member wesam's Avatar
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    I just want to know which will be better in this area as i can lean/rich the 15-20 kpa columns at high rpm
    also my dfco is not enabled in this area maybe because speed shifting (0.3 sec)
    EFILive Tuner

  4. #4
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    If you are trying to tune High Rpm/Low MAP (very difficult to do correctly)..then you are better off taking your vehicle up to 6800 Rpm in a slow deliberate fashion and then in the same gear let the throttle go to 0% (No DFCO).

    Answering your question in that fashion you would maintain the same stoich value (14.7 AFR) as the the remainder of the 'no-load' portion of your VE Table.

    I don't think you will ever be able to nail it on a .3 second shift, but 14.7 would be the answer.
    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..


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