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Correcting odometer/speedometer for bigger tires

Discussion in '3rd Gen. Tacomas (2016+)' started by Coaltown992, Jan 23, 2020.

  1. Jan 23, 2020 at 10:24 PM
    #1
    Coaltown992

    Coaltown992 [OP] Active Member

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    So I recently got new tires that are bigger than the stock ones, so now it doesn't count miles the way it should, when the speedometer shows 60mph it's actually doing 65, and my miles to empty is wrong too. Anyways, I called the dealer and they said that's aftermarket work and they don't do that, so I called the place they recommended and they quoted me about $300 for the part and about another $150 for the labor.

    I've got to wonder, are they just trying to rip me off? I can't believe modern day vehicles still use a mechanical gear system for this and that it isn't all calculated electronically...
     
    bigmw likes this.
  2. Jan 23, 2020 at 10:33 PM
    #2
    Ronzio

    Ronzio Well-Known Member

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  3. Jan 24, 2020 at 1:48 AM
    #3
    Garab

    Garab Well-Known Member

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  4. Jan 24, 2020 at 2:43 AM
    #4
    bigmw

    bigmw Not-So-Well-Known Member

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    Action Cap with OTR and Yakima roof rack; step bars; hood and window deflectors; skid plate; KO2s; Curt brake controller
    ScanGauge II can be customized to show vehicle speed, and it can be calibrated for different tire size. Plus it gives you a lot of other info

     
    Tocamo likes this.
  5. Jan 24, 2020 at 3:50 AM
    #5
    bacon_st

    bacon_st Well-Known Member

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    What a rip off that place is, don't go back. Just buy the above part yourself and put it in yourselves. I haven't done this to my truck, I have bigger wheels, but I havent put this in yet.
    What about California tacos?
     
  6. Jan 24, 2020 at 4:11 AM
    #6
    djgynee

    djgynee Well-Known Member

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    So.. according to my math for the 33” tires I put on it works out to +1mph for every 15mph.

    ODOMETER/ ACTUAL

    15mph / 16mph
    30mph / 32mph
    45mph / 48mph
    60mph / 64mph
    75mph / 80mph
    90mph / Ticket!

    I just keep the 60&70 in mind and add 4&5 and you’ll be fine

    Note: there’s actually a tire calculator online so it’s not my math
     
    Big tall dave and Skydvrr like this.
  7. Jan 24, 2020 at 4:13 AM
    #7
    bacon_st

    bacon_st Well-Known Member

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  8. Jan 24, 2020 at 4:29 AM
    #8
    Garab

    Garab Well-Known Member

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  9. Jan 24, 2020 at 5:31 AM
    #9
    aro

    aro Well-Known Member

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    58electricman likes this.
  10. Jan 24, 2020 at 5:33 AM
    #10
    GreyBaldTaco

    GreyBaldTaco Well-Known Member

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    Can't correct the speedo in that shit hole of a state
     
    Phlogiston, Tnc and Skydvrr like this.
  11. Jan 24, 2020 at 6:30 AM
    #11
    Joe671

    Joe671 YouTube Mechanic

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    65 on my speedo = 69 actual. Good to know. Doesn't bother me enought (yet) to fix it lol.

    Speedo.jpg
     
  12. Jan 24, 2020 at 6:53 AM
    #12
    FLA_Hoosier

    FLA_Hoosier Well-Known Member

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    Hell, I've got the stock wheels/tires and my speedo is off by 4 MPH (slow) at 70. I just adjust accordingly.
     
    5465 likes this.
  13. Jan 24, 2020 at 7:45 AM
    #13
    Coaltown992

    Coaltown992 [OP] Active Member

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    I'm mainly concerned about the miles to empty lol
     
  14. Jan 24, 2020 at 7:49 AM
    #14
    GreyBaldTaco

    GreyBaldTaco Well-Known Member

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    The gas gauge is great for that.
     
    BRFab, ericvega, BrianPVan and 6 others like this.
  15. Jan 24, 2020 at 11:20 AM
    #15
    FLA_Hoosier

    FLA_Hoosier Well-Known Member

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    It's not accurate WITH stock wheels/tires. Shows 0 with about 4-5 gallons still in the tank. If you're concerned, drive it down to under 10 miles left and then fill up. Bet you can only get about 16-17 gallons in the 21 gallon tank.
     
    ericvega and GreyBaldTaco like this.
  16. Jan 24, 2020 at 11:35 AM
    #16
    hillbillynwv

    hillbillynwv Well-Known Member

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    When I bought my truck with 285's already on it I was concerned about how fast am I really going.
    There has been a lot of interstate work in my area so I encounter those radar "your speed is" machines.
    From what I see my speedometer is dead on.
     
  17. Jan 24, 2020 at 11:47 AM
    #17
    dpippel

    dpippel Well-Known Member

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    Has anyone tried this, or the HyperTech, on a 2020 3.5L?
     
  18. Jan 24, 2020 at 11:50 AM
    #18
    GreyBaldTaco

    GreyBaldTaco Well-Known Member

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    The dealer installed one of the hypertech or rough country modules.
     
    Last edited: Jan 24, 2020
  19. Jan 24, 2020 at 3:56 PM
    #19
    NavyDad

    NavyDad Well-Known Member

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    Manufacturers do this to keep the highways from being littered with stalled vehicles and idiots walking with gas cans.
     
  20. Jan 24, 2020 at 4:31 PM
    #20
    Steve Urquell

    Steve Urquell No Pants

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    When I was a truck shop foreman with drivers complaining about speedo inaccuracies I'd tell them to check their odometer against the mile markers.

    This would give me a percentage to go by to get an adapter. You can also just calculate it easily. 10% slow will be 66mph at 60, 77 at 70 etc.
     

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