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Thread: Changing Stoich in $0D

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  1. #1
    Super Moderator Six_Shooter's Avatar
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    Mark means 14.13.

    In my experiance this change doesn't seem to make a difference in how the engine runs and I believe it's because of how Lambda works, and with the bin really being set for Lambda but displayed as AFR through the use of formulas, it doesn't change how stoich reacts.

    I don't believe it will hurt, just that it doesn't seem to something to stress over.
    The man who says something is impossible, is usually interrupted by the man doing it.

  2. #2
    Fuel Injected! brian617's Avatar
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    Quote Originally Posted by Six_Shooter View Post
    Mark means 14.13.

    In my experiance this change doesn't seem to make a difference in how the engine runs and I believe it's because of how Lambda works, and with the bin really being set for Lambda but displayed as AFR through the use of formulas, it doesn't change how stoich reacts.

    I don't believe it will hurt, just that it doesn't seem to something to stress over.
    I've read the thread "AFR Gasoline - E10 Wide Band O2 sensor tuning using Lambda" about 15-20 times and still hurts me brain.

    However from other posts Mark mentioned easier BLM tuning, which is where I'm at right now with my first attempt at tuning.
    89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
    95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
    05 Outback XT 2.5L turbo gas auto

  3. #3
    RIP EagleMark's Avatar
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    It won't change how engine runs. Just how the ECM/PCM starts it's fueling calculation. The only thing that will change is BLM readings from having a proper starting point.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  4. #4
    Fuel Injected! brian617's Avatar
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    Quote Originally Posted by EagleMark View Post
    It won't change how engine runs. Just how the ECM/PCM starts it's fueling calculation. The only thing that will change is BLM readings from having a proper starting point.
    Thats the way I understood it after searching and reading today. And since I haven't adjusted my fuel tables yet I thought I would make the correction to the AFR before I corrected the BLMs.

    Again I dont see where to change it, in my Engine Constants all I have is Injector Flow Rate and Cylinder Volume.

    Is it something I have to add in?
    89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
    95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
    05 Outback XT 2.5L turbo gas auto

  5. #5
    RIP EagleMark's Avatar
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    That's where it is in my $0D which is not stock, I re-organized and made it simpler. Use Tools, Parameter Finder and search for it. "Stoichiometric AFR"

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  6. #6
    Fuel Injected! brian617's Avatar
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    Did the search and found it only under "Open Loop AFR Parameters"?
    89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
    95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
    05 Outback XT 2.5L turbo gas auto

  7. #7
    RIP EagleMark's Avatar
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    So why the question?

    Like I said I've moved a lot around in mine from stock $0D. But there's only one.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

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