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Thread: AEM Wideband transform question

  1. #1
    Tuner in Training
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    Apr 2019
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    AEM Wideband transform question

    I'm using an AEM 30-0300 wideband I've noticed that my wideband reads a little different (.5 to 1 point) than what HPtuners sees when using the proper transform ratio (V/.42105263)+7.3125. For instance my wideband gauge will say I'm at 14.2 and HPtuners says I'm at 15.1. I'm using the same formula that the manual states and what HPtuners has by default. I'm using AFR not lambda.

    I've changed the formula a little to more closely match what my wideband is actually showing me.(V/.45105263)+7.3125 (With in.2-.4 points now)

    Is this typical to have to manually adjust the formula for each wideband or do I just have a wonky one?
    I've done the resistor cal and free air cal with the same results.

    Thanks guys.
    05 Silverado Single Cab Long Bed
    LM7
    VS Racing 7875 12 PSI
    E85
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    BTR Stage 2 Turbo Cam
    Built 4l80E

  2. #2
    Senior Tuner
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    u should leave the v/.42105263 as is but just change the +7.3125 to suit the voltage offset u must have that way it adds to correct the offset and not the calculation, what ever u are out by say .5 or 1 subtract that from the 7.3125 and it should dial it straight in

  3. #3
    Tuner in Training
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    Great ill give that a try tomorrow thanks for the reply!

  4. #4
    Advanced Tuner
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    Quote Originally Posted by Ecobear86 View Post
    Great ill give that a try tomorrow thanks for the reply!
    How did you get it to work?
    Daily Driver= 1998 Pontiac Grand Prix GTP Coupe (3.4 pulley, SD Headers, SLP catback, FWI, 180 t-stat, hotwired FP, Autolite 103's, poly dogbone bushings, solid rubber engine and trans mounts, self tuned with HP Tuners)
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