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mileage corrections.

Discussion in '1st Gen. Tacomas (1995-2004)' started by AlexanderD, Apr 7, 2010.

  1. Apr 7, 2010 at 7:41 AM
    #1
    AlexanderD

    AlexanderD [OP] Well-Known Member

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    hey,
    so when changing to larger tires. from say my 235 70 r16s to say 31" tires there will be a change in gearing and therefor a change in odometer reading over a given distance. this will throw off a mileage calculation by a few points at least i would think

    calculations.

    235 70 r16

    235x.7=
    164.5 x2=
    329 / 25.4=
    12.95+16=
    28" dia
    ---------------
    28x3.14=
    90.95" circumference
    ---------------
    31"dia

    31x3.14=
    97.39" circumference

    that roughly a 6% difference

    thoughts?

    is there a way to match things up so the odometer will read correctly?
     
  2. Apr 7, 2010 at 7:45 AM
    #2
    luk8272

    luk8272 Poodoo

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    As far as I know there is no way to correct the Odom in our trucks. However if you have a scanguage it keeps the correct mileage. I check the scanguage against my math everytime I fuel up.
     
  3. Apr 7, 2010 at 9:03 AM
    #3
    cinch

    cinch Member Extraordinaire

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    How does a scangauge know that you have a different tire size?:eek:
     
  4. Apr 7, 2010 at 9:11 AM
    #4
    luk8272

    luk8272 Poodoo

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    You program it in on the initial setup.
     
  5. Apr 7, 2010 at 9:13 AM
    #5
    Chad

    Chad Rand Paul 2016

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  6. Apr 7, 2010 at 9:27 AM
    #6
    Chad

    Chad Rand Paul 2016

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    True, but still, it's nice to have everything synchronized with what it should be. MPG, Speed, Odo, etc. It also helps with the gears and shifting.
     
  7. Apr 7, 2010 at 9:27 AM
    #7
    luk8272

    luk8272 Poodoo

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    yeah Id go scanguage 2. You can also customise some of your options on you Scanguage.
     
  8. Apr 7, 2010 at 10:51 AM
    #8
    Coolidge

    Coolidge Well-Known Member

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    I drive w/my GPS on. Good thing too. With 35" tires on my Gen 1, Speedo off appx 8mph. Big difference!! Is there really no way to recallibrate?
     
  9. Apr 7, 2010 at 12:07 PM
    #9
    AlexanderD

    AlexanderD [OP] Well-Known Member

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    i hope you use your gps for reference for your oil changes!
     
  10. Apr 8, 2010 at 5:27 AM
    #10
    AlexanderD

    AlexanderD [OP] Well-Known Member

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    the difference is actually a parabolic curve. so the faster you go the more the difference is from read to actual. at what speed is yours out by 8mph?

    there must be some way! how does the speedo actually work? is it electronic? or is it mechanically driven?
     
  11. Apr 8, 2010 at 7:01 AM
    #11
    Janster

    Janster Old & Forgetful

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    Nice!

    I was searching around on the Hypertech website in hopes I'd find one of their products would do everything a Scangauge would do PLUS give transmission temps/oil pressure, etc.

    Nope....
    (damn, I was hoping)
     
  12. Apr 8, 2010 at 7:19 AM
    #12
    AlexanderD

    AlexanderD [OP] Well-Known Member

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  13. Apr 8, 2010 at 9:16 AM
    #13
    Coolidge

    Coolidge Well-Known Member

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    King coilovers frt +3". Bilstein 5100 shocks rear w/AAL, K&N FIPK, Magnablow exhaust, Billet grill, clear corner lights, Sony stereo, JBL, Sub etc.
    Why? :confused:
    Just change your oil frequent/regularly
     
  14. Apr 8, 2010 at 8:21 PM
    #14
    dispatcher101

    dispatcher101 Active Member

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    Just drive it like you stole it!!! GPS works too though. I have pretty much memorized the speed difference so I don't use it anymore. with 33's: 67 is actually about 75; and the difference gradually goes down from there.
     
  15. Apr 9, 2010 at 5:32 AM
    #15
    AlexanderD

    AlexanderD [OP] Well-Known Member

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    well say you have 35" tires and your odometer says 5000 miles you have actually gone 5857 miles. thats a big difference! not to mention the extra wear on your engine from trying to turn the big ass tires.
    might not make that much of a difference but...
     
  16. Apr 12, 2010 at 9:46 AM
    #16
    Coolidge

    Coolidge Well-Known Member

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    King coilovers frt +3". Bilstein 5100 shocks rear w/AAL, K&N FIPK, Magnablow exhaust, Billet grill, clear corner lights, Sony stereo, JBL, Sub etc.
    M'kay...

    I usually change oil @ 'around' 3K anyway
     
  17. Apr 12, 2010 at 3:49 PM
    #17
    mattleegee

    mattleegee Well-Known Member

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    at 65 mph on the ODO my GPS reads 59mph

    30" tires
     
  18. Apr 12, 2010 at 8:26 PM
    #18
    AlexanderD

    AlexanderD [OP] Well-Known Member

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    Now that is kind of odd. Should be the other way around I think. Have you done any other gearing changes?
     
  19. Apr 12, 2010 at 9:35 PM
    #19
    mattleegee

    mattleegee Well-Known Member

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    dunno just bought the truck

    we have a wired speedo cable right?
    cant we just get a built speed sensor for our gears/tire size?
     
  20. Apr 12, 2010 at 9:40 PM
    #20
    SurfInferno

    SurfInferno Dont be stupid, its not smart.

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    take the needle off, make sure its set at zero, put the needle back on to compensate for the MPH. worked for me
     

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