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Acceptable speedometer error?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by stro1965, Nov 24, 2008.

  1. Nov 24, 2008 at 12:58 PM
    #1
    stro1965

    stro1965 [OP] Well-Known Member

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    Does anyone know what Toyota would consider to be acceptable error on a speedo? Mine if off by a full 5 mph at highway speeds as compared to my GPS. When my speedo says 80, my GPS says 75. It's off a little less the slower I go, obviously.

    I stopped down and made an appointment to have the techs verify it next week but the service writer said he THINKS that Toyota considers anything within 10% to be acceptable. I think that is ridiculous.

    What I THINK might be the problem is that my truck came with 16" tires, whereas most other Tacoma models come with 17's. I'm wondering if all of the Tacoma ECM's are programmed the same?

    The service writer also said that he didn't think there was any way to adjust the calibration, which I found odd. I can't believe it can't be adjusted.
     
  2. Nov 24, 2008 at 1:05 PM
    #2
    Hadoken

    Hadoken Active Member

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    I don't have a GPS or anything, but every time I pass one of the speed detectors that the police put by the side of the road here in NC my 05 with 17" factory wheels is off about 3 MPH at 50 MPH. If my speedo says 50, I'm going about 47.
     
  3. Nov 24, 2008 at 1:06 PM
    #3
    RelentlessFab

    RelentlessFab Tacoma offroad armor fabricating beast Vendor

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    Had tons on the old Taco's.... new Tundra is pretty stock
    5MPH at 80 doesnt seem too bad to me, i know my truck read about 2-3 mph slow at 60-65 so yours seems to fall in line to me. with my larger tires now mine reads a tad slow if anything. to my knowledge there is no way to calibrate them at the moment. the 16" vs. 17" really wont make a difference, the overall tire diameter is what will make the difference not the wheel.
     
  4. Nov 24, 2008 at 1:11 PM
    #4
    Justin626

    Justin626 Well-Known Member

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    Well, atleast it's showing to high instead of too low. Not knowing you're going 5 mph faster than your speedo shows could get expensive.:burnrubber:
     
  5. Nov 24, 2008 at 1:36 PM
    #5
    grivera

    grivera Well-Known Member

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    Isn't there a way to reprogram it with one of those gismos that allow you to change computer settings. A friend of mine has a Mustang and when he said that when he put on larger wheels and tires, he entered the new tire size into the unit. Maybe he was blowing smoke up my a**...
     
  6. Nov 24, 2008 at 2:05 PM
    #6
    Lentsnh

    Lentsnh Well-Known Member

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    yeah,(but anyone correct me if im wrong) i think there is a program out there that you can install onto your laptop, and you can ajust the settings on your car computer.
     
  7. Nov 24, 2008 at 3:47 PM
    #7
    45longcolt

    45longcolt Well-Known Member

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    Mine came with 265/70/16's. They say if you switch to 265/75/16's it corrects your speedo or at least gets it much closer. Mine is about 2-4 MPH slow compared to the GPS or the Garmin. In about another 20K I will find out because I plan to go with the 75 profile with new tires. :)
     
  8. Nov 24, 2008 at 4:31 PM
    #8
    stro1965

    stro1965 [OP] Well-Known Member

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    When I left the service desk I went out to the salesman who sold me the truck. I bitched about it to him about it and he claimed they'd "make it right" no matter what Toyota says (we'll see). He mentioned swapping out tires for a larger size so maybe I could talk him into a more aggressive tread pattern at the same time.
     
  9. Nov 24, 2008 at 4:37 PM
    #9
    Evil Monkey

    Evil Monkey There's an evil monkey in my truck

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    Unless the odometer is also off, which means your warranty expires early.
     
  10. Nov 24, 2008 at 4:39 PM
    #10
    eordonez

    eordonez Living vicariously through mjp2

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    My speedometer is off by 5 km/h slower that's about 3mph, i have 265/65R17 wheels
     
  11. Nov 24, 2008 at 4:41 PM
    #11
    stro1965

    stro1965 [OP] Well-Known Member

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    Ya know...I never thought about that. Does the speedo error mean that the odometer is racking up miles faster than I actually am? I would think so.
     
  12. Nov 24, 2008 at 4:47 PM
    #12
    LonghornTaco

    LonghornTaco Can you pass the bailout please?

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  13. Nov 24, 2008 at 5:11 PM
    #13
    RelentlessFab

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    Had tons on the old Taco's.... new Tundra is pretty stock
    yep, its a conspiracy.......yay! over size tires = more warranty :D:bananadance:5% larger tire= 37888 miles out of my 36000 mile warranty!
     
  14. Nov 24, 2008 at 6:09 PM
    #14
    stro1965

    stro1965 [OP] Well-Known Member

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    I just found the tire size calculator thing and, according to that, I would need to go from a 265 up to a 305 tire to correct that much error. I assume that this is not an option without a lift kit.
     
  15. Nov 24, 2008 at 6:14 PM
    #15
    Justin626

    Justin626 Well-Known Member

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    True, true.
     
  16. Nov 24, 2008 at 6:23 PM
    #16
    BeefTaco

    BeefTaco WESTern Alliance: NORCAL COAST

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  17. Nov 24, 2008 at 7:11 PM
    #17
    stro1965

    stro1965 [OP] Well-Known Member

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    Thanks Beeftaco, that chart would seem to indicate that mine is outside Toyota's own acceptable limits. We'll see what they say.
     
  18. Nov 24, 2008 at 7:49 PM
    #18
    Johnson8537

    Johnson8537 Well-Known Member

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    Mine was also off until I installed my Lift and new wheels and tires!
    Now GPS is RIGHT ON!!!

    (Maybe Toyota will pay for my lift wheels and tires? The amount i paid to correct the issue... :D just kidding)
     
  19. Nov 24, 2008 at 7:51 PM
    #19
    LonghornTaco

    LonghornTaco Can you pass the bailout please?

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    Yeah, mine was about 3 mph fast at 65 before the new tires (according to the Scangauge). Now, my speedo is about 2 mph slow at 65.
     
  20. Nov 24, 2008 at 8:36 PM
    #20
    WilsonTheDog

    WilsonTheDog Kylie's dad

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    This doesn't matter because they're the same outside diameter regardless of rim size.

    Everyone who's tested theirs has found the same or similar, approx. 3 MPH off. I tested mine with both GPS and radar and that's exactly what it was. On my Tacoma now, with larger tires (from 30.5" to 31.6"), it's dead on.
     
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