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  1. #1
    Fuel Injected! Terminal_Crazy's Avatar
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    LT1 $EE tuning for E10

    Hi guys,
    after losing my post I just typed out, I'll keep this brief.

    What do I need to alter on $EE to go from E0 to E10 fuel.
    Running 95 LT1 383 CL SD No MAF
    My WB reads in AFR and the 12.8 target should be about 12.3 on E10. 0.96 correction factor for E10
    Do I just increase the PE correction tables.

    Anything else I should change like OL AFR target?


    Also, how would i richen the cruise area. 1k-2k rpm 60-80 map.
    VE tables just tune themselves back out.
    Would raising the O2 swing voltages help here, By how much ?

    TIA
    Cheers
    Mitch
    '95 Z28 M6 -Just the odd mod.
    '80 350 A3 C3 Corvette - recent addition.

  2. #2
    Fuel Injected! ralmo94's Avatar
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    Stioch for E10 is about 14.1:1,
    100% gas 14.7:1
    Wide band only reads lambda and represents it in AFR scale of 100% gas
    The essiest way is to adjust commanded PE Afr to get desired reading on Wide band
    Assuming already in tune.

    Hope that makes sense
    No need to re-invent the wheel. But we can make it better

  3. #3
    Fuel Injected! Terminal_Crazy's Avatar
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    Quote Originally Posted by ralmo94 View Post
    Stioch for E10 is about 14.1:1,
    100% gas 14.7:1
    Wide band only reads lambda and represents it in AFR scale of 100% gas
    The essiest way is to adjust commanded PE Afr to get desired reading on Wide band
    Assuming already in tune.

    Hope that makes sense
    Yeah, that's what i'm doing.

    If it's running stoich on E0 the WB will be showing 14.7
    If i then switch to E10, at stoich the WB will still read 14.7 yes?
    At WOT I'd want to target 12.3 though.

    What about the OL AFR Tables, would I scale those as well?

    Thanks
    Mitch
    '95 Z28 M6 -Just the odd mod.
    '80 350 A3 C3 Corvette - recent addition.

  4. #4
    Fuel Injected! ralmo94's Avatar
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    Quote Originally Posted by Terminal_Crazy View Post
    Yeah, that's what i'm doing.

    If it's running stoich on E0 the WB will be showing 14.7
    If i then switch to E10, at stoich the WB will still read 14.7 yes?
    Correct. This is a subject that can be very complicated and confuse a lot of people, but it doesn't have to.
    If you think of AFR as the recipe the computer uses to get the final lambda reading in the exhaust.
    All oxygen sensors can read is the lambda of the exhaust. Stoich.
    They don't read the the recipe that gets it that way. Lambda 1 is stoich. It is only expressed in AFR to be easily understood.
    E10 stoich recipe is 14.1 = lambda 1
    E0. Stoich recipe is 14.7 = lambda 1

    I'm not familiar with EE, but the proper way to do it, is to change the stoich AFR value in the computer from 14.6 or 14.7 to 14.1.
    But if the open loop tables still are referenced in AFR they still would need to be scaled as well.
    To find what AFR is in lambda AFR divided by stoich AFR.
    EXAMPLE
    13afr divided by 14.7 stoich = 0.88 lambda
    13afr divided by 14.1 stoich = 0.92 lambda

    0.92 lambda multiplied by 14.7 stoich is 13.5 AFR.
    So if you have a reading on the wideband of 13 AFR, the lambda is 0.88
    The recipe to get it is different for different stoich fuels

    So the easiest way, is adjusting the commanded AFR until you get the desired reading on the wideband,

    Did I confuse anyone yet?
    No need to re-invent the wheel. But we can make it better

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  6. #6
    Fuel Injected! ralmo94's Avatar
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    Quote Originally Posted by steveo View Post
    for E10 i just fudge the injector constant by 4-5% of enrichment. that'll cover everything.
    That sounds easy and quick
    Is the constant the lb per hr?
    No need to re-invent the wheel. But we can make it better

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