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Thread: Tire Rev Calubration

  1. #1
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    Default Tire Rev Calubration

    Is there any chance you guys will add tire revs per mile so we can change tire size in internal flash? It seems you guys had it in the 5.9s but stopped after that. Is that correct?

  2. #2
    Forum tyhee Site Admin GMPX's Avatar
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    I think it is handled in another module on the later vehicles (someone may correct me on that).


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    Okay, dang was hoping we could add that in. Thanks for letting me know.

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    It's handled in the ECM, at least on the 2007.5-2012. It's in tire revs/km, 3 parameters, 2 parameters with the same value, 395.xxxx revs/km than the third is some "tire size adjustment after wear" parameter with a value of something like 315.xxx revs/km.

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    Quote Originally Posted by Jim P View Post
    It's handled in the ECM, at least on the 2007.5-2012. It's in tire revs/km, 3 parameters, 2 parameters with the same value, 395.xxxx revs/km than the third is some "tire size adjustment after wear" parameter with a value of something like 315.xxx revs/km.
    I think what you're referring to is used to calculate the N/V load. The speedometer is controlled by the BCM module in the 13 and newer trucks.

    AlfaOBD or a HyperTech tire calibrator is what I use to adjust the speedometer.

  6. #6
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    thank you I will look into that.

  7. #7
    Lifetime Member Road's Avatar
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    A good scan tool like a snap on will allow tire calibration.

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