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Thread: LS3 engine Injector Bank assignments..... letters versus numbers

  1. #1
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    Default LS3 engine Injector Bank assignments..... letters versus numbers

    Question regarding this table...... does anyone know if A=cylinder1, B=Cylinder 2, C=Cylinder 3, etc. Seems like it should show Bank 1 injectors as A-C-E-G for 1-3-5-7. Instead it looks like bank 1 and bank 2 injectors don't correspond to bank 1 and 2 cylinders.

    This is in a 2010 Camaro, 18 lbs boost on a TVS2300, squash twin fuel pumps on a return system, wet nitrous with direct port injection.
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    Last edited by Blue70SS; July 16th, 2015 at 04:24 AM.

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    The problem I'm trying to correct is bank 2 wideband AFR runs about .5 AFR higher than bank 1 only on WOT during 1/4 mile data logging. Narrowband sensors are off about the same percent. Narrow band sensors were swapped and the problem doesn't follow. Both wide bands have been recalibrated. Next step is to swap widebands and recalibrate to open air for about the 4th time, but not expecting a change since the narrowband swap proved the difference I think. I was thinking of doing an individual injector correction, but stumped by the letter to number correlation. Exhaust and intake have both been smoke tested for leaks and everything is sealed up good.

  3. #3
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    My theory is fuel is supplied to bank 2 fuel rail and then flows out both ends to bank 1.... I think bank 2 gets a scavaging effect that lowers the fuel flow versus the dead ended bank 1 under higher flow conditions. Problem occurs with or without nitrous on..... so nothing to do with nitrous jetting.

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    Quote Originally Posted by Blue70SS View Post
    Question regarding this table...... does anyone know if A=cylinder1, B=Cylinder 2, C=Cylinder 3, etc. Seems like it should show Bank 1 injectors as A-C-E-G for 1-3-5-7. Instead it looks like bank 1 and bank 2 injectors don't correspond to bank 1 and 2 cylinders.
    I think the A-H follows the firing order.

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    Thanks Statesman,!

    So sounds like this: (the "2-6" in the firing order explains the odd diagram)
    1-8-7-2-6-5-4-3 Firing Order LS3
    A-b-C-d-e-F-g-H Letter assignments
    1-2-1-2-2-1-2-1 Corresponding Bank Assignments

    So for "injector individual correction" based on lettering A through H,
    to add fueling to bank 2:
    Increase the numbers for b-d-e-g injectors

    Sound correct?

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    Sounds good to me.

  7. #7
    Joe (Moderator) joecar's Avatar
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    This is what I have in my notes:

    Code:
    Cylinder Labels:
              2 4 6 8
      <-Front
              1 3 5 7
    
    Coil Labels:
              D G E B
      <-Front
              A H F C
    
    Injector Labels:
              5 2 4 7
      <-Front
              8 1 3 6
    
    Firing Sequence:
    Cylinders: 1-8-7-2-6-5-4-3 (firing order)
    Coils:     A-B-C-D-E-F-G-H
    Injectors: 8-7-6-5-4-3-2-1
    Last edited by joecar; July 16th, 2015 at 09:09 PM.

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    So for the injectors, A-H = 8-1 ?

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    Thanks for info joecar! The 8-1 for injectors seems odd, since the "individual injector correction" page shows letters. The correction factor starts at 1.0 and goes from 0 - 2, which looks like 2=100% more and 0 = 100% less.

    So if the A-H = 8-1 holds true, to adjust by letter in the screenshot below - I would need to adjust B-D-E-G higher to compensate for bank 2 (2/4/6/8 cylinder #s)being leaner than bank 1?

    Click image for larger version. 

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    Last edited by Blue70SS; July 17th, 2015 at 03:19 AM. Reason: clarity

  10. #10
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by statesman View Post
    So for the injectors, A-H = 8-1 ?
    Yes, injector # follows reverse firing order.

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