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Thread: Changing Stoich in $0D

  1. #1
    Fuel Injected! brian617's Avatar
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    Changing Stoich in $0D

    Most if not all fuel available to me is going to be E10. Can I change Stoich to 14.1-2:1 in my $0D .Bin?
    89 K1500 Scottsdale 5.7L 5spd 3:42

    Build specs: 97 4 bolt main block 350ci, Eagle rotating assembly with flat tops and 4 valve reliefs, Dart 165cc/67cc Iron Eagle heads, Manely SS valves and springs 110lbs seat @1.7, GM Ram Jet cam 196/206 @.50 .431/.451, stock intake and throttle body, heads and intake gasket matched, Delco EP377 fuel pump @ 22 psi, 427 PCM.

  2. #2
    EFI GearHead ! EagleMark's Avatar
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    Yes, 13.13 is the accurate calibration.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  3. #3
    Fuel Injected! brian617's Avatar
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    Forgive my stupidity, but that makes no sense to me. Where and how do I change that?
    89 K1500 Scottsdale 5.7L 5spd 3:42

    Build specs: 97 4 bolt main block 350ci, Eagle rotating assembly with flat tops and 4 valve reliefs, Dart 165cc/67cc Iron Eagle heads, Manely SS valves and springs 110lbs seat @1.7, GM Ram Jet cam 196/206 @.50 .431/.451, stock intake and throttle body, heads and intake gasket matched, Delco EP377 fuel pump @ 22 psi, 427 PCM.

  4. #4
    EFI GearHead ! EagleMark's Avatar
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    Engine Constants folder "Stoichiometric AFR "

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

  5. #5
    Fuel Injected! brian617's Avatar
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    All I have in that folder is Injector Flow Rate and Cylinder Volume. Wrong XDF?
    89 K1500 Scottsdale 5.7L 5spd 3:42

    Build specs: 97 4 bolt main block 350ci, Eagle rotating assembly with flat tops and 4 valve reliefs, Dart 165cc/67cc Iron Eagle heads, Manely SS valves and springs 110lbs seat @1.7, GM Ram Jet cam 196/206 @.50 .431/.451, stock intake and throttle body, heads and intake gasket matched, Delco EP377 fuel pump @ 22 psi, 427 PCM.

  6. #6
    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.

  7. #7
    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

    Build specs: 97 4 bolt main block 350ci, Eagle rotating assembly with flat tops and 4 valve reliefs, Dart 165cc/67cc Iron Eagle heads, Manely SS valves and springs 110lbs seat @1.7, GM Ram Jet cam 196/206 @.50 .431/.451, stock intake and throttle body, heads and intake gasket matched, Delco EP377 fuel pump @ 22 psi, 427 PCM.

  8. #8
    EFI GearHead ! 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!
    -= =-

  9. #9
    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

    Build specs: 97 4 bolt main block 350ci, Eagle rotating assembly with flat tops and 4 valve reliefs, Dart 165cc/67cc Iron Eagle heads, Manely SS valves and springs 110lbs seat @1.7, GM Ram Jet cam 196/206 @.50 .431/.451, stock intake and throttle body, heads and intake gasket matched, Delco EP377 fuel pump @ 22 psi, 427 PCM.

  10. #10
    EFI GearHead ! 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!
    -= =-

  11. #11
    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

    Build specs: 97 4 bolt main block 350ci, Eagle rotating assembly with flat tops and 4 valve reliefs, Dart 165cc/67cc Iron Eagle heads, Manely SS valves and springs 110lbs seat @1.7, GM Ram Jet cam 196/206 @.50 .431/.451, stock intake and throttle body, heads and intake gasket matched, Delco EP377 fuel pump @ 22 psi, 427 PCM.

  12. #12
    EFI GearHead ! 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!
    -= =-

  13. #13
    Fuel Injected! brian617's Avatar
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    I guess I just assumed it would only apply to open loop and not work in closed loop?
    89 K1500 Scottsdale 5.7L 5spd 3:42

    Build specs: 97 4 bolt main block 350ci, Eagle rotating assembly with flat tops and 4 valve reliefs, Dart 165cc/67cc Iron Eagle heads, Manely SS valves and springs 110lbs seat @1.7, GM Ram Jet cam 196/206 @.50 .431/.451, stock intake and throttle body, heads and intake gasket matched, Delco EP377 fuel pump @ 22 psi, 427 PCM.

  14. #14
    EFI GearHead ! EagleMark's Avatar
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    The other way... this is the target for Closed Loop. In Open loop there is a seperate table.

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

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