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Thread: ABS engaging after larger tires on 09 Tahoe when turning

  1. #1

    ABS engaging after larger tires on 09 Tahoe when turning

    Looking into how to scale the tables. Been years since I have played with HP. Things have changed a lot! Searched around with no luck. The tables I have stock are VSS tire revs per: Dist 379.69, Dist err 37.34, Dist Trans 653.39, Dist T Err 653.39. According to EC Tunes spread sheet My old tire is a 30.8" and the new is 32.3" according to a rollout. My question is why do the stock numbers seem incorrect? What am I missing? Shouldn't the ECM dist be 653.39 Tire revolutions per mile and the trans be larger since the driveshaft spins faster? Shouldn't VSS PPM be a large number? Thanks in advance for any direction!
    Last edited by steath; 02-23-2016 at 08:03 PM.

  2. #2
    Any help appreciated

  3. #3
    Tuning Addict 5FDP's Avatar
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    Did you use the gear/tire wizard to change the tire size and then hit auto scale?? It's under the edit tab.

    That's all I've ever done and never got any lights. I went from a 29-30in tire on my sierra and to 31.9 tires and it worked great.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  4. #4
    Quote Originally Posted by 5FDP View Post
    Did you use the gear/tire wizard to change the tire size and then hit auto scale?? It's under the edit tab.

    That's all I've ever done and never got any lights. I went from a 29-30in tire on my sierra and to 31.9 tires and it worked great.
    Thanks for the reply. Yes i used it and it improved the shifting and corrected the speedo. Nothing I adjusted seemed to effect the MPH the ABS computer was seeing. Must be pulling wheel speed directly from the sensors. I have the ABS cycling on tight turns.

  5. #5
    Senior Tuner mbray01's Avatar
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    Dec 2013
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    Slidell, La.
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    the is a spot in speed calibration,

    abs out pulses

    needs to be corrected the same amount as calibration for speedo
    therefore abs,pcm, jive
    Michael Bray
    Rusty Knuckle Garage
    Slidell, Louisiana
    20yr Master Tech.
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