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Calibrating speedo for new tires?

Discussion in 'Wheels & Tires' started by Packman73, Nov 7, 2008.

  1. Nov 7, 2008 at 7:19 AM
    #1
    Packman73

    Packman73 [OP] ^^^^ 3%er ^^^^

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    I bought my truck as-is with the lift and larger tires. Is there a device that calibrates the speedometer? If so, how can I tell if I have one or that my speed is my actual speed without having the wife drive next to me on the highway? Thanks.
     
  2. Nov 7, 2008 at 7:21 AM
    #2
    Delmarva

    Delmarva Mayor of TW

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    Hypertech makes an inline calibrator for our trucks - haven't used it or know too much about it.
     
  3. Nov 7, 2008 at 7:32 AM
    #3
    Packman73

    Packman73 [OP] ^^^^ 3%er ^^^^

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    It may already have one on it...I just don't know where to look for it. :confused:
     
  4. Nov 7, 2008 at 7:33 AM
    #4
    Janster

    Janster Old & Forgetful

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  5. Nov 7, 2008 at 7:55 AM
    #5
    LonghornTaco

    LonghornTaco Can you pass the bailout please?

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    You could also get the ScanGauge II. I have that and adjusted my speed for the percentage size change of my tires.

    Essentially, the difference was only about 2-3 MPH at 65. Before the tires, my speedo was 3 mph fast at 65. After the change in tire size, my speedo was 2-3 mph slow at 65.
     
  6. Nov 7, 2008 at 8:14 AM
    #6
    das56170

    das56170 Well-Known Member

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    Flowmaster cat-back exhaust, volant cold air intake, 3" lift with AAL, 285/75 r 16 pro comp xterrains, 1" differential drop, spare tire mod, hypertech in-line speedometer calibrator, debadged
    I have the hypertech inline speedometer calibrator in my truck. It plugs in behind the speedometer. It takes a couple of minutes to hook up to your computer and enter the old and new tire sizes. Then it plugs in pretty easily. The only pain in the ass was taking the dash apart...and even that was pretty easy.
     
  7. Nov 7, 2008 at 8:16 AM
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    myrcrocks

    myrcrocks The Reasonable One

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    So both of these units (Hypertech and Scanguage) will re-calibrate the speedo? What about the odometer? Approximate cost on each unit?
     
  8. Nov 7, 2008 at 8:22 AM
    #8
    das56170

    das56170 Well-Known Member

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  9. Nov 7, 2008 at 8:32 AM
    #9
    LonghornTaco

    LonghornTaco Can you pass the bailout please?

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    +1. The scangauge only display information, however it's not just speed. It does ALL SORTS of stuff too! About $150-ish.

    I might look in to the hypertech if, for no other reason, to keep my odometer pretty dang close.
     
  10. Nov 7, 2008 at 8:35 AM
    #10
    myrcrocks

    myrcrocks The Reasonable One

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    This is what I'm thinking...
     
  11. Nov 7, 2008 at 8:53 AM
    #11
    Packman73

    Packman73 [OP] ^^^^ 3%er ^^^^

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    Thanks for the info. I'm assuming my speed is off.
    So, if I'm running oversized tires, does that mean that the odometer is recording less miles than the truck has actually traveled?
     
  12. Nov 7, 2008 at 9:06 AM
    #12
    MyTaco

    MyTaco Well-Known Member

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    I have 33's and according to my Scangauge the the odo is is reading correctly. Oddly the speedo still reads 2-3 mph fast
     
  13. Nov 7, 2008 at 9:10 AM
    #13
    Delmarva

    Delmarva Mayor of TW

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    yes -- assuming there isn't a speedo recalibrator installed.
     
  14. Nov 7, 2008 at 9:17 AM
    #14
    Packman73

    Packman73 [OP] ^^^^ 3%er ^^^^

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    Ok, thanks. :)
     
  15. Nov 7, 2008 at 3:51 PM
    #15
    boogie

    boogie Well-Known Member

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    FWIW....I recently put 35x12.5 x17's on my 05DC with a 6" lift. When my spedo showed 65mph my garmin showed 74mph.

    The 35's rubbed so badly I took the truck back to the installer and had them replaced with 33x12.5's.

    With the 33's the spedo and the garmin are almost in total agreement.
     
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