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Correcting odometer/speedometer for bigger tires

Discussion in '3rd Gen. Tacomas (2016-2023)' started by Coaltown992, Jan 23, 2020.

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

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    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...
     
    Coaltown992, Jan 23, 2020
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    bigmw likes this.
  2. Jan 23, 2020 at 10:33 PM
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    Ronzio

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    Ronzio Well-Known Member

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    Ronzio, Jan 23, 2020
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  3. Jan 24, 2020 at 1:48 AM
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    Garab

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    Garab Well-Known Member

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

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    bigmw Not-So-Well-Known Member

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    Bunch of different mods
    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

     
    bigmw, Jan 24, 2020
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  5. Jan 24, 2020 at 3:50 AM
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    bacon_st

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    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?
     
    bacon_st, Jan 24, 2020
    #5
  6. Jan 24, 2020 at 4:11 AM
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    djgynee

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    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
     
    djgynee, Jan 24, 2020
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  7. Jan 24, 2020 at 4:13 AM
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    bacon_st

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    bacon_st Well-Known Member

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

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    Garab Well-Known Member

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

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    aro Well-Known Member

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    aro, Jan 24, 2020
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  10. Jan 24, 2020 at 5:33 AM
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    GreyBaldTaco

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    GreyBaldTaco Well-Known Member

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    Can't correct the speedo in that shit hole of a state
     
    GreyBaldTaco, Jan 24, 2020
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  11. Jan 24, 2020 at 6:30 AM
    #11
    Joe671

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    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
     
    Joe671, Jan 24, 2020
    #11
  12. Jan 24, 2020 at 6:53 AM
    #12
    FLA_Hoosier

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    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.
     
    FLA_Hoosier, Jan 24, 2020
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  13. Jan 24, 2020 at 7:45 AM
    #13
    Coaltown992

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    Coaltown992 [OP] Active Member

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    I'm mainly concerned about the miles to empty lol
     
    Coaltown992, Jan 24, 2020
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  14. Jan 24, 2020 at 7:49 AM
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    GreyBaldTaco

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    GreyBaldTaco Well-Known Member

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    The gas gauge is great for that.
     
    GreyBaldTaco, Jan 24, 2020
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  15. Jan 24, 2020 at 11:20 AM
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    FLA_Hoosier

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    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.
     
    FLA_Hoosier, Jan 24, 2020
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  16. Jan 24, 2020 at 11:35 AM
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    hillbillynwv

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    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.
     
    hillbillynwv, Jan 24, 2020
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  17. Jan 24, 2020 at 11:47 AM
    #17
    dpippel

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    dpippel Well-Known Member

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

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    GreyBaldTaco Well-Known Member

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

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    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.
     
    NavyDad, Jan 24, 2020
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  20. Jan 24, 2020 at 4:31 PM
    #20
    Steve Urquell

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    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.
     
    Steve Urquell, Jan 24, 2020
    #20
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