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Scangauge Question

Discussion in '2nd Gen. Tacomas (2005-2015)' started by snowgod06, Mar 26, 2010.

  1. Mar 26, 2010 at 7:35 PM
    #1
    snowgod06

    snowgod06 [OP] UG legend wannabe

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    crap bolted and welded together....
    On the SG, if stock tires are 245/75/16 and my new tires are 285/75/16. Would the 7% increase I input be enough to compensate so my MPH, MPG, etc.. stays accurate. I think i did my math right on the calculation.
     
  2. Mar 26, 2010 at 7:42 PM
    #2
    jhodge83

    jhodge83 Any dog under 50# is a cat and cats are useless... Moderator

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    wat?
  3. Mar 26, 2010 at 7:43 PM
    #3
    snowgod06

    snowgod06 [OP] UG legend wannabe

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    so instead of me inputting the +7% i need to input -7%?
     
  4. Mar 26, 2010 at 7:44 PM
    #4
    jhodge83

    jhodge83 Any dog under 50# is a cat and cats are useless... Moderator

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    wat?
    well you are having less tire rotations since the tire is a larger circumference, so i would say -7
     
  5. Mar 26, 2010 at 7:47 PM
    #5
    snowgod06

    snowgod06 [OP] UG legend wannabe

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    ok thanks, when i did the calculation i got a positive number. I used the calculation, 100x(1-(old tire size/new tire size)) and got +7.01%. But ill go with your answer of -7%. Thanks again
     
  6. Mar 26, 2010 at 7:48 PM
    #6
    jhodge83

    jhodge83 Any dog under 50# is a cat and cats are useless... Moderator

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    wat?
    thats going off the tire calc on here too...now if that's the right interpretation, i dunno....thats just the rotation difference....if they are asking for the diameter difference, then the tire calc says 7.8%

    Diameter inches (mm)30.47 (773.9)32.83 (833.9)2.36 (60) 7.7%
    Width inches (mm)9.65 (245)11.22 (285)1.57 (40) 16.3%
    Circum. inches (mm)95.72 (2431.28)103.14 (2619.77)7.42 (188.49) 7.8%
    Sidewall Height inches (mm)7.23 (183.75)8.42 (213.75)1.19 (30) 16.5%
    Revolutions per mile (km)661.93 (411.06)614.31 (381.48)-47.62 (-29.58) -7.2%
     
  7. Mar 26, 2010 at 7:52 PM
    #7
    snowgod06

    snowgod06 [OP] UG legend wannabe

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    Ohh.. I went and used it and i thought that i had to use the Diameter % change in order to get closer to an accurate reading.
     
  8. Mar 26, 2010 at 7:54 PM
    #8
    jhodge83

    jhodge83 Any dog under 50# is a cat and cats are useless... Moderator

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    wat?
    then if its the diameter change, its the +7.8% above
     
  9. Mar 26, 2010 at 7:56 PM
    #9
    snowgod06

    snowgod06 [OP] UG legend wannabe

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    This is what i read, so now I'm confused..

    The right and left upper buttons can be used to increase/decrease the
    selected adjustment in 1% steps. The lower left number is the speed
    reported by the vehicle. The lower right number is the speed which will
    be shown by the ScanGaugeII by applying this correction. Positive
    values of % will increase the displayed speed. Negative values of % will
    decrease the displayed speed. The approximate % to use for a tire size
    change can be computed by dividing the diameter of the original
    equipment tire by the diameter of the new tire, subtract this from 1 and
    multiply by 100. For instance, if the diameter of the original tires was 24
    inches and the size of the new tire is 30 inches, 100x(1-(24/30)) = 20.
    Setting the value to 20% will compensate for the tire size change.
     
  10. Mar 26, 2010 at 7:59 PM
    #10
    jhodge83

    jhodge83 Any dog under 50# is a cat and cats are useless... Moderator

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    wat?
    then yeah....they are asking for the diameter difference and not the rotational difference...it's up to you though if you want it +7 or 8%
     
  11. Mar 26, 2010 at 8:01 PM
    #11
    snowgod06

    snowgod06 [OP] UG legend wannabe

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    ok thats good, i just had to check tho before i start to drive. And i think ill toy around with the +7 or +8 till i see what is more accurate. Thanks for your help.
     
  12. Mar 26, 2010 at 9:14 PM
    #12
    Isthatahemi

    Isthatahemi Well-Known Member

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    Tire diameter and rotational difference are the same! Anyhow -2% is closer to what you want. 245`s are showing 5% high to start with.
     
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