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Tire Dia. Measurement for Hpertech Speedo Calibrator

Discussion in '3rd Gen. Tacomas (2016+)' started by Idaman, Mar 26, 2019.

  1. Mar 26, 2019 at 9:44 AM
    #1
    Idaman

    Idaman [OP] Member

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    Talking to tech support from Hypertech, reading Tacomaworld forums, and watching YouTube post after post I programed the Hypertech tuner to read new tire diameter in actual inches instead of using tire factory nomenclature. Now, since I'm rather ignorant about this stuff, I am assuming that when entering tire data into the Hypertech tuner if the old tire size is known does a person enter the factory spec diameter? Common sense tells me that is what is done due to the fact that the old tires are not on the truck to get an actual measurement. I then entered the new tire size in average actual diameter (lfom top of rubber to the ground) as discussed on forums tech support, and from YouTube videos. Any comments?
     
  2. Mar 26, 2019 at 9:48 AM
    #2
    doublethebass

    doublethebass aspiring well-known member

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    I think that's probably a good move. Nothing you can do if you don't have the old tires to measure.....that said, the true OD gets smaller as the tires wear, so it's all an estimation anyway.

    I'm looking at going the Hypertech route sometime sooner than later (just put 33s on mine) and I think I'm going to go with the nominal OD sizes.....so 30.6" for the OEM 265/70/16s and then 33.1 for the new 255/85/16s

    Something makes me doubt even Toyota has different calibrations for different tire sizes since there are several OEM tire sizes on the different trims.

    As long as you're getting pretty close, that's about as good as it'll get
     
  3. Mar 26, 2019 at 9:52 AM
    #3
    Exracer2

    Exracer2 Well-Known Member

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    Stop trying to over-engineer this. Input the closest measurements you can. Go for a drive with a GPS. Make adjustments as nessecary.
     
    beergeek likes this.
  4. Mar 26, 2019 at 10:12 AM
    #4
    Idaman

    Idaman [OP] Member

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    You're right! As a retired engineer I do have a tendency to over analyze.
     
    doublethebass likes this.
  5. Mar 26, 2019 at 6:18 PM
    #5
    hawaii_dave

    hawaii_dave Well-Known Member

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    rough country inline speedometer calibration module is the same one as the hypertech just at a better price . its $150 on Amazon
     
  6. Mar 26, 2019 at 6:33 PM
    #6
    doublethebass

    doublethebass aspiring well-known member

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  7. Mar 26, 2019 at 6:34 PM
    #7
    hawaii_dave

    hawaii_dave Well-Known Member

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    I'm running the Rough country one it works great . it's within 1-2 miles per hour
     
    doublethebass likes this.
  8. Mar 26, 2019 at 6:37 PM
    #8
    sstock86

    sstock86 Well-Known Member

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    I used the hypertech on mine. Was an easy enough install considering you have to go behind the gauges.
     
  9. Apr 8, 2019 at 8:39 AM
    #9
    Razor24

    Razor24 OV Tuned,4" lift/w 33"s, S&B cold air intake

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    That green connector is a picture of the 2016-2017 model #730123, the 2016-2018 model #730123 does'nt have it. I just bought one and after removing my speedo cluster found one already there. After I program mine, I'll test the older unit ...... might make a deal for someone! I'm guessing the first owner did'nt program it correctly.....
     
  10. Apr 8, 2019 at 8:48 AM
    #10
    Synergy001

    Synergy001 IG: @pnwx.taco

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    I’m using the Rough Country version and it uses the Hypertech module and app. I put tire size in inches and it’s dead on with Waze

    A82C4A86-B598-4648-9C7F-6EF05C6BC3CA.jpg

    2B580FA1-6C8E-4981-AB96-00CD211830DA.jpg
     
    doublethebass and PNWTacoma like this.
  11. Apr 8, 2019 at 8:52 AM
    #11
    PNWTacoma

    PNWTacoma Well-Known Member

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    Good to know...have you tested it at hwy speeds to see if it's still accurate?
     
    Synergy001 likes this.
  12. Apr 8, 2019 at 8:56 AM
    #12
    Synergy001

    Synergy001 IG: @pnwx.taco

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    Yeah it’s still pretty accurate
     
  13. Jul 20, 2019 at 12:13 PM
    #13
    ninernation

    ninernation Well-Known Member

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    Did your mpg estimates change as well? Does it work with adaptive cruise control?
     
  14. Jul 22, 2019 at 7:16 AM
    #14
    Razor24

    Razor24 OV Tuned,4" lift/w 33"s, S&B cold air intake

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    Yes, my mpg's adjusted as well as my shift points. I'm pleasantly surprised how it changed. I now have a spare Hypertech, listed on craigslist (springfield,mo)
     
    GreyBaldTaco likes this.
  15. Nov 10, 2019 at 12:42 PM
    #15
    tacomatyler

    tacomatyler Well-Known Member

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    @Razor24 still have your Hypertech for sale?
     
  16. Nov 11, 2019 at 6:39 AM
    #16
    Razor24

    Razor24 OV Tuned,4" lift/w 33"s, S&B cold air intake

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    @tacomatyler ,Yes I still have a spare Hypertech. Was going to re-list on Craigslist for $125. Looks like your not to far away
     
    tacomatyler likes this.
  17. Nov 11, 2019 at 7:29 AM
    #17
    tacomatyler

    tacomatyler Well-Known Member

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    I’ll PM you. Thanks!
     

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