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Thread: 2020 GT speedo Calibration

  1. #1

    2020 GT speedo Calibration

    2020 GT. Just swapped to 29.5 inch tall rear tires.

    I see the editor and the scanner have options, I tried making the changes In the editor and my speedo did not change at all.

    The scanner says my current gear ratio value is 494.08 I don't know what this number is or how to come up with my new one.

  2. #2
    Senior Tuner veeefour's Avatar
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    You need to switch to calibration. Normally taken from IPC.

  3. #3
    Quote Originally Posted by veeefour View Post
    You need to switch to calibration. Normally taken from IPC.
    So I switch the "learn from BCM" to "use calibration" and just input the tire sizes? Do I have to do the change in the scanner also? I'll try it when I get home today.

  4. #4
    Advanced Tuner LastPlace's Avatar
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    The scanner now lets you adjust the bcm with special functions, or use Forscan.

  5. #5
    Senior Tuner veeefour's Avatar
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    Quote Originally Posted by LastPlace View Post
    The scanner now lets you adjust the bcm with special functions, or use Forscan.
    +2018 is a different story, bcm changes with scanner are not so obvious...wont accept certain ratios.