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Thread: NGK AFX in lambda

  1. #1
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    NGK AFX in lambda

    How is everyone setting up their NGK AFX wideband to read in lambda and then setting up PID's for commanded lambda and lambda error?

    I tried setting up a custom user for EIO that should have provided lambda readings, but instead it still provided AFR when logging. This made the custom PID's unable to be used.

    I have the EIO setup at Volts/.7096 + 9.1 and then the sensor and units sets to lambda.

  2. #2
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    Someone correct me if this stuff is wrong -

    Lambda From NGK AFX:


    Lambda Error:


    Commanded Lambda:
    2012 Chevy Cruze A6 1LT RS

    Formerly - 2004 GTO, 2002 Z28, 2007 Colorado, 2008 Silverado

  3. #3
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    Btw, I don't know if it is just me, but if I use the .7096 + 9.1 for AFR, I get a reading of 11 AFR when my AFX unit is showing stoich...
    2012 Chevy Cruze A6 1LT RS

    Formerly - 2004 GTO, 2002 Z28, 2007 Colorado, 2008 Silverado

  4. #4
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    volts should be .7142 and 9 is the + value
    The display is programmed to read 14.57:1 as stoich. I just use that number and tune from there
    Last edited by MMGT1; 03-04-2012 at 09:58 PM.
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  6. #6
    Senior Tuner DSteck's Avatar
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    I actually use V/10.41 + 0.62. It spits out 1.000 lambda during the startup procedure. I basically trust the 0.62 to 1.1 range that NGK specifies.

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  7. #7
    i was working on doing the samething. I have my AFX reading in my main table in lambda as an eio input. What is the best way with the 2.3 bata to set it up for commanded lambda. Also for a lambda err. historgram?

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    Quote Originally Posted by eficalibrator View Post
    AFX Lambda = [ Volts / 10.37 ] + 0.618
    Greg, can you explain why your formula differs from the one DSteck and I use? Ours appears accurate to me when I log.

    Quote Originally Posted by afasttransam View Post
    i was working on doing the samething. I have my AFX reading in my main table in lambda as an eio input. What is the best way with the 2.3 bata to set it up for commanded lambda. Also for a lambda err. historgram?
    Look at the screen shots I posted. You will see a custom Lambda Error parameter and a custom Commanded Lambda parameter.

    Pay close attention to how I have the Commanded Lambda setup. You need to use the stoich value that you input in to your tune to get lambda.
    2012 Chevy Cruze A6 1LT RS

    Formerly - 2004 GTO, 2002 Z28, 2007 Colorado, 2008 Silverado

  9. #9
    Senior Tuner eficalibrator's Avatar
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    Quote Originally Posted by Gh0st View Post
    Greg, can you explain why your formula differs from the one DSteck and I use? Ours appears accurate to me when I log.
    Rounding error. They're both really close. I just did mine by converting the min and max AFRs supported (9.0 and 16.0, respectively) to lambda (dividing by ECM's reference value of 14.56 for Indolene clear) and solving via y=mx+b.

  10. #10
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    Thank you for the explanation, Greg. Glad to see you're still around
    2012 Chevy Cruze A6 1LT RS

    Formerly - 2004 GTO, 2002 Z28, 2007 Colorado, 2008 Silverado

  11. #11
    Senior Tuner DSteck's Avatar
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    Quote Originally Posted by eficalibrator View Post
    Rounding error. They're both really close. I just did mine by converting the min and max AFRs supported (9.0 and 16.0, respectively) to lambda (dividing by ECM's reference value of 14.56 for Indolene clear) and solving via y=mx+b.
    I used the lambda range they specified instead of AFR, seeing as how it originates off of lambda anyway.

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  12. #12
    Senior Tuner eficalibrator's Avatar
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    Quote Originally Posted by DSteck View Post
    I used the lambda range they specified instead of AFR, seeing as how it originates off of lambda anyway.
    Yeah, well I use an AFM1500 and LambdaPro with even wider ranges and more accuracy.

    I think we're both saying the same thing here and both answers are going to give the average enthusiast data that's closer than he is able to argue about given combustion instability and his ability to fine-tune beyond the equation's limitation.

  13. #13
    I am still working on getting mine set up. Other than my AFX being [AUX.20121] and my AFR set at 14.56 i have mine set up the exact same. When i connect it to my car i get unsupported parameter for my Commanded Lambda and my Lambda err. My AFX is set to EIO Input 1. Wonder if i should try it as EIO input 2

  14. #14
    party foul on me!!!!! i had put my command afr low res and not afr high res in my tables Everything working good now.. Thanks for the help

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    what about a histogram for lambda error? do you use lambda error for tunning the same way you do afr error in a histogram for tuning the ve table?
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  16. #16
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    Yes, throw AFR error out the window and just use your Lambda error. I provided screen shots of how mine is setup above.
    2012 Chevy Cruze A6 1LT RS

    Formerly - 2004 GTO, 2002 Z28, 2007 Colorado, 2008 Silverado

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    Quote Originally Posted by Gh0st View Post
    Commanded Lambda:
    I have my Commanded Lambda function set up as 1/[PID.6010] or 1/equivalence ratio.

    Are there any significant differences between the two, besides mine automatically accounting for different stoichs?

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    Quote Originally Posted by Beatdown Z View Post
    I have my Commanded Lambda function set up as 1/[PID.6010] or 1/equivalence ratio.

    Are there any significant differences between the two, besides mine automatically accounting for different stoichs?

    You want:

    commanded air fuel / stoich = lambda

    So in my example, if I commanded 12.1 my commanded lambda would be .85

    Your way should work too, but I've never used equivalence ratio. I'll try it because then I won't have to change my scanner settings when changing fuels.
    Last edited by Gh0st; 03-25-2012 at 05:59 AM.
    2012 Chevy Cruze A6 1LT RS

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  19. #19
    Senior Tuner LSxpwrdZ's Avatar
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    I use EQ ratio because by definition it is just the inverse of lambda. I do this because I tune multiple vehicles that may have varying stoich settings based on where they are from and fuel being used. This saves me the trouble of having to go in and edit the custom PID for each different vehicle I tune with different fuel.

    Gotta watch out on some of the Gen4 stuff cause EQ=Lambda on some of them.
    Last edited by LSxpwrdZ; 01-12-2013 at 06:44 AM.
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  20. #20
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    Just wondering, but why are you guys wanting to read lambda instead of afr?
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