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Speedometer correction..

Discussion in '2nd Gen. Tacomas' started by Bill in Ky, Mar 6, 2008.

  1. Bill in Ky

    Bill in Ky [OP] Well-Known Member

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    Bright White 08 Reg 4X4 2.7 5spd SR5
    I got my first 4x4 in 1972...haven't been without one! I still like Chrome!
    In 2 miles of driving my odometer will gain 1/10 of a mile. Am I
    correct in saying that my speedometer and odometer are 5% fast. If so if my speedometer says 50 I am actually doing 55, if it says 100 I am doing 110. Correct me if I am wrong.
    Can a dealer correct the speedometer?
    Thanks guys!
     
  2. Janster

    Janster Old & Forgetful

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    Jandy
    Lancaster, PA
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    2007 4.0L 4x4 TRD Sport Access Cab A
    Advantage Torza top (tri-fold), Husky floor mats, RuffTuff seat covers, C2C hood struts, Homelink mirror, USA Spec PA15-Toy (120gig Classic & 8gig nano), Garmin Nuvi 660, Protecta Bed mat, Pop-n-lock, TSB Springs, Scangauge II, Heated drivers seat, Fumoto drain valve, Aries pushbar, PIAA 540 fog lights, Hood scoop grahics, Flowmaster 50 series dual catback exhaust, RainX Latitude windshield wipers, Husky rear floor liner (ontop of folded down seats). Console Vault.
    My speedo (in dash) reads 2mph fast according to my GPS. With the Scangauge II hooked up, it's actually accurate to the GPS. So - the dash output is calibrated slightly off.

    I did a slow test mile and I think I was .02 mile off in one mile. Again - comparing my trip odometer with the GPS.

    Not sure about the dealer making corrections - have you called them to ask?

    You can make changes if you have a Scangauge II, but I'm not sure if that's only a 'Scangauge output' or if it changes the readings in the actual calculations within the computer. ???

    Anyone?
     
  3. maverick491

    maverick491 Towing Guru

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    Activator III brake controller, Extang Fulltilt toneau, Factory bed mat, Extra D-rings in the bed, 2ndary air filter removed, Garmin Ique GPS, Eco-2, AFE Pro Dry-s filter, USASPEC PA12-toy, Pioneer 3-way speakers, SG II on Blendmount, Gulf States Alarm added.
    Correcting through the Scangauge only corrects the scangauge. It has no controll over the output to the dash. However, if you are running a scangauge you still need to correct the speedo as it uses that data in some of it's other calculations.

    My speedometer was dead on according to my GPS, and after I corrected the Scangauge all three devices (dash, Scangauge, and GPS) agreed.
     
  4. Bill in Ky

    Bill in Ky [OP] Well-Known Member

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    Bright White 08 Reg 4X4 2.7 5spd SR5
    I got my first 4x4 in 1972...haven't been without one! I still like Chrome!
    You are right Phantom, thank you

    I guess I thought 10% was easier to figure
     
  5. jhodge83

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

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    Jamie
    Moncks Corner, SC
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    wat?
    mine was 2 mph fast according to my gps. now that i have the larger tires, the speedo is dead on, but the odo is off now.
     
  6. Evil Monkey

    Evil Monkey There's an evil monkey in my truck

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    Robert
    Escondido, CA
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    If you odometer is saying you went 2.1 miles when you actually went 2 miles, then the speedometer is indicating you're going faster than you really are; when it says 55 you're only going 52.75 (55-5%). If it says 100, you're actually going 95.

    rate = time * distance

    If the distance is indicating too far (it shows 2.1 when it should show 2.0), the rate must be indicating too high (indicating 55 when it should indicate 52.75).
     
  7. TacoTurd

    TacoTurd Defying Alliances since 2007

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    Central Texas
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    TRD Exhaust, TRD CAI, Bull Bar, PIAA lights, Passport, Bed Mat, UWS Toolbox, Hood Struts, Rear TSB, TRD/Okole Seat Covers, Hellwig Rear Sway Bar, Burned Carpet, Nasty Dent in Roof
    Johnson beat me to it. Yer arithmetic was bassackwards.

    The interesting part is your warranty will expire with less than 36,000 actual miles. Neat huh? :mad:
     
  8. Evil Monkey

    Evil Monkey There's an evil monkey in my truck

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    Robert
    Escondido, CA
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    Weathertech front & rear mats, rear suspension TSB, Toytec AAL for TSB, Hi-Lift Jack, Bilstein 5100 & Toytec Adjustable coilovers, Built Right UCAs, KMC XD 795 Hoss Wheels, Definity Dakota MTs 285/75R16, Leer XR, Thule Tracker II & Thule MOAB basket
    Never thought about that. :mad: Good point.
     
  9. colinb17

    colinb17 If at first you don't succeed, don't try skydiving

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    Colin
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    Build thread in sig...
    on the other hand, put a nice set of 40 in. tires on it and you get a good sized extension on the warranty.:devil:
     
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