SCT Livewire TS with NGK AFX wide band

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  1. #1

    Icon6 SCT Livewire TS with NGK AFX wide band

    99 Ford Lightning

    I am trying to get my NGK AFX wide band to feed input to the SCT

    I am uncertain if the formula (1.4*v) + 9 is what I should use.
    How does one know if there is an offset to consider ? How can I check that ?

    The formula above is also listed in the manual. However, when I contacted NGK the tech gave me 2 other formulas to try

    (8.68*v) +10
    and
    (2+v)+10

    Any tips on this would be greatly appreciated - it is a bit confusing

    Don

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  3. #2
    Premium Member Array Eric Brooks's Avatar
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    Default

    The correct formula is (V*1.4)+9

    Use that, then if the display is reading differently than your SCT device, adjust the value after the + until you get it reading as close as possible.

  4. #3

    Default

    OK thanks

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  6. #4

    Default

    Just wanted to say thanks - NGK FX wideband yellow to 9608 SCT cable red wire NGK AFX brown to SCT black and green
    USE Analog 7 in the Live Link software - Use the (1.4*v)+9 formula The cable chart says use analog 2 - incorrect

    SCT phone tech support was not helpful and even misleading

  7. #5

    Default

    I know, an old post but this is the way the equation works.
    You need to know what the NGK AFX wide band's min and max reading are. Then you can make the equation yourself.

    Example 1, if minimum AXF gage A/F reads is "9". In the equation when the V(0 to 5volts)minimum=0. The constant in the equation is "9" and the SCT data will read A/F of 9.
    Simply put, the constant is the minimum A/F the gage (9) will read because the V=0 at minimum.
    Gage reads A/F 9:1. (0*1.4)+9=9 SCT reads 9

    Example 2, if the maximum AXF reads is "16". In the equation when the V(0 to 5 volts) maximum=5. The multiplier in the equation is 1.4 and the SCT data will read A/F of 16.
    The "multiplier" is then calculated from the maximum A/F the gage will read (16) because the V=5 at maximum. (16-9)/5=1.4 is the multiplier.
    Gage reads A/F 16:1. (5*1.4)+9=16 SCT reads 16

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