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Thread: Speedometer calibration

  1. #1
    Potential Tuner
    Join Date
    Aug 2020
    Posts
    1

    Speedometer calibration

    I have an 07 crown victoria p71 and I'm in the process of changing gear ratio from 3.27 to 3.73 I have stock tires 235/55/18 and wondering is there a scan tool that I can use to recalibrate my speedometer is so please advise what else I need to do as well .

  2. #2
    Tuner in Training
    Join Date
    Feb 2020
    Posts
    17
    u can use hptuners by vcm suite
    some cars dont need credits and you can change gear or tire ratio by vcm scanner like dodge
    but crown vic's need a tune by vcm suite which need credits
    stock tires is 235/55/17 or 225/60/17 not 18"

  3. #3
    Tuner in Training
    Join Date
    Feb 2020
    Posts
    17
    u can change gear ratio very easy dont worry but needs a tune