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Speedometer accuracy

Discussion in '2nd Gen. Tacomas (2005-2015)' started by octacorunner, Jan 1, 2011.

  1. Jan 1, 2011 at 1:08 PM
    #1
    octacorunner

    octacorunner [OP] Well-Known Member

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    Hi. Sorry if this is a newb question, but I have tried to search for the info and couldn't yield any results.

    I have a 2011 Taco DCSB Prerunner and it came with the 245/75r16 tires. Are the factory speedometer settings the same on my truck as it is on the TRD versions with 265/75r16 tires? I just want to know if Toyota actually has different speedometer settings for the different tire sizes. Thanks in advance for any help, and happy new year!
     
  2. Jan 1, 2011 at 1:21 PM
    #2
    KellyJoe

    KellyJoe Well-Known Member

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    To answer your question. No. I have the same as you and compared to GPS I'm slow about 4 MPH. Here's a good tire calculator that'll show you the differences.

    http://www.1010tires.com/tiresizecalculator.asp
     
  3. Jan 1, 2011 at 1:22 PM
    #3
    Hunter500ky

    Hunter500ky Well-Known Member

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    I HATED that my speedo was off with my factory tires it really annoyed me I just put on 265 75 16's speedometer is dead on now hahahaha
     
  4. Jan 1, 2011 at 1:24 PM
    #4
    jhodge83

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

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    wat?
    and now your ODO is slightly off.
     
  5. Jan 1, 2011 at 1:25 PM
    #5
    Drunknsloth

    Drunknsloth Indffrnce will be the fall of manknd but who cares

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    Hmm... Yeah, my speedo is off around 3mph against my ultraguage.
     
  6. Jan 1, 2011 at 1:33 PM
    #6
    octacorunner

    octacorunner [OP] Well-Known Member

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    so the factory speedometer setting is for the 265/75r16 tires? (TRD versions) at least i have a reason to change my tires :p
     
  7. Jan 1, 2011 at 1:34 PM
    #7
    jhodge83

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

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    wat?
    the stock sized 265's are a 265/70/16. the 75 series are slightly larger.
     
  8. Jan 1, 2011 at 1:41 PM
    #8
    octacorunner

    octacorunner [OP] Well-Known Member

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    ahh my mistake. do you know the effects on the odometer due to this? i just want to make sure its not reading that im putting more miles on it than i actually am. thanks for the quick replies guys
     
  9. Jan 1, 2011 at 1:42 PM
    #9
    jhodge83

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

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    wat?
    larger tire = ODO reads slower
     
  10. Jan 1, 2011 at 1:45 PM
    #10
    cc350

    cc350 Buckeye Member

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    My speedometer is off 3mph with the factory size tires, 265/70/16. Guess Toyota does this to all their Tacomas to Kill our warranties faster.;)
     
  11. Jan 1, 2011 at 1:47 PM
    #11
    jhodge83

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

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    wat?
    your ODO will ready true, but just the speedo is off from the factory. still in their "tolerances". apparently the loss comes from a digital/analog conversion where the ODO and speedo differ. no need for anyone to panic:goingcrazy:

    :D
     
  12. Jan 1, 2011 at 3:27 PM
    #12
    knayrb

    knayrb Well-Known Member

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    Your speedometer will never be perfect. It's not the speedometer's fault. The difference in circumference from a new tire to a worn-out tire could be up to 4%. You lose about a half inch tread (1 inch total diameter) during the life of the tire. If you were the manufacture what would you calibrate your speedometer with? Worn, new or somewhere in between? I wish car manufactures would go to a Doppler motion sensor which reads the speed of the surface moving beneath.
     
  13. Jan 2, 2011 at 6:58 AM
    #13
    cc350

    cc350 Buckeye Member

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    No panic here. I'm at 74,200 on the odo. Speedo was off by 5mph with the worn BFG's went 2 weeks ago and put on new Firestone Destinations AT's now off by 3mph. Guess it's a nice to have some allowance there for times the foot is heavy.
     
  14. Jan 2, 2011 at 7:05 AM
    #14
    jhodge83

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

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    wat?
    my speedo reads 5-6mph slow at 70 and my ODO reads 13% slow...it's all good:D
     
  15. Jan 2, 2011 at 7:12 AM
    #15
    Fire931

    Fire931 Well-Known Member Vendor

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    Shoot that ain't nothing!!

    Mine reads 53 when I'm going 70..... lol
     
  16. Jan 2, 2011 at 4:06 PM
    #16
    06TXED

    06TXED Well-Known Member

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    I went to 265/70R17 and my speedo reads dead on with my TomTom GPS
     
  17. Jan 2, 2011 at 4:49 PM
    #17
    05Moose

    05Moose Middle-Aged Member

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    x2. Here's a link to their "acceptable" tolerances:
    http://www.toyotanation.com/forum/showthread.php?t=356029
     
  18. Jan 18, 2011 at 5:39 PM
    #18
    Joepbj

    Joepbj Member

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    I'm a newbie and recently noticed that my 2011 TRD Sport is off by 3-4 mph. I'm actually going 3-4 mph slower than the speedometer indicates (according to my Garmin). So it's off by 5 or 6 percent, depending on what speed I'm travelling at. That means my gas mileage is basically 5-6 percent off (less mpg) also, correct? And when the odometer reads 100k, it'll really only have 95k? Do you think the dealership will recalibrate it? It's only 3 months old and not to sound anal but I paid almost 2 grand for a 100k extended warranty. I don't want to feel ripped off if at 103k my transmission goes out, when really I only have 98k on the truck.
     
  19. Jan 18, 2011 at 6:01 PM
    #19
    island808

    island808 Me l've got brains.

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    interesting... my obd speed, gps speed and speedometer speed are so close I couldn't say the gauge was off at all. I mean, if it was meant to be super accurate it would have hash marks on it. Its marked to be accurate within 5 mph. Tire pressure and wear and brand can all put it off a couple mph at speed.

    THere is at least one company making a device to correct speedometers in vehicles like this. Its an inline device that interrupts or generates the proper signal once you've told it where you are and where you were.
     
  20. Jan 18, 2011 at 6:03 PM
    #20
    David K

    David K Well-Known Member

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    I would like a techie to explain if the ODO is seperate from the SPEEDO... As the rest of you, my speedo reads 68 or so, when my GPS says I am going 65. I do think the odometer reads true, however... Maybe not?
     
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