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Thread: NGK AFX Stoich Value

  1. #11
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    Hello and thanks for help.
    yes I read and tried that text file but I think the voltage offset of ad1 is throwing it out. 0.5 to 4.5
    I will retry the xls input again, I dont know how to calibrate the ad inputs though.
    regards gav

  2. #12
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by Gav View Post
    Hello and thanks for help.
    yes I read and tried that text file but I think the voltage offset of ad1 is throwing it out. 0.5 to 4.5
    I will retry the xls input again, I dont know how to calibrate the ad inputs though.
    regards gav
    You measured with a DMM and see how much voltage offset...?

  3. #13
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    Hi Joe,
    Sorry what i meant is that from the Manuel :
    'Vout is the analog voltage of the AFRM(0.5v to 4.5v)' So it must output 0.5v at 9 AFR and 4.5 at 20 AFR. By the way it is the 2nd version i think of the NGK AFX.
    Also from the book:
    Gasoline AFR = {(Vout-0.5)x2.75}+9
    Lambda = {(Vout-0.5v)x0.189)}+0.62

    Regards
    Gav

  4. #14
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by Gav View Post
    Hi Joe,
    Sorry what i meant is that from the Manuel :
    'Vout is the analog voltage of the AFRM(0.5v to 4.5v)' So it must output 0.5v at 9 AFR and 4.5 at 20 AFR. By the way it is the 2nd version i think of the NGK AFX.
    Also from the book:
    Gasoline AFR = {(Vout-0.5)x2.75}+9
    Lambda = {(Vout-0.5v)x0.189)}+0.62

    Regards
    Gav
    Post the user manual you have.

    Is it the same as this one (see page 11): afx_tuning_manual_rev_06.pdf

  5. #15
    Lifetime Member darcy's Avatar
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    Sounds like its a NTK AFRX, Joe.

    Gav, have a look at this thread: https://forum.efilive.com/showthread...-Ratio-Monitor

  6. #16
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    Hi,
    yes it is the one darcy posted. In that thread shows the user manual and shows designed to run on 14.7 as stoich. I thought I was losing it as most other people were getting it to work with a different formula....might have to alter the text file for afr and ben then?
    thanks for help this far though, regards gav

  7. #17
    Joe (Moderator) joecar's Avatar
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    Ah, it's an NTK and not an NGK... (the equation is different).

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