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Odo vs GPS / Speedo vs GPS

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Priddle, Dec 29, 2010.

  1. Dec 29, 2010 at 6:07 AM
    #1
    Priddle

    Priddle [OP] And now for something completely different....

    Joined:
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    St. John's, NL Canada
    Vehicle:
    2007 Tacoma 4x4 SR5
    Current: Vent Visors, Running Borads, tint, Ride Rite airbags, front 5100's @ 2.5, Toytec Front diff drop
    I went from 245's to 265/70r18's knowing my speedo and odo would be out by around 6.5% according to the math. The other day I had my Garmin GPS in the truck and at 100kph, the GPS showed I was actually doing around 106-107kph. 'Very good', I figured. That was the expected difference. Yesterday I did a highway run and decided to compare the odo. After 10km on the odo, I did 11 on the GPS. After watching it for 50+kms, I confirmed the difference was 10%. But the speedo difference was still ~6.5%.

    Could the odo and speedo in the truck be out of sync? If indeed I am getting 10% extra distance versus 6.5%, my gas mileage is not as bad as I thought it was.
     
  2. Dec 29, 2010 at 6:14 AM
    #2
    larryde09

    larryde09 Well-Known Member

    Joined:
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    Larry
    Rochester, NY
    Vehicle:
    (Traded-in) 06 2.7L 5-spd SR5 4x4
    K&N Intake, Magnaflow Cat-back Exhaust, Altezza Tail Lights, Pop&Lock Tailgate Lock, Extang Trifecta Tonneau Cover, PIAA foglights with stock switch, DrawTite Hitch, OBX Shift Knob, Hood Protector, Vent Visors, DIY step bars/sliders/running boards, DIY Bed Lights, DIY Running Board/Ground Lights, DIY Tailgate Electrical Box (12V socket, voltage and current gauges), DIY Internal Lighting (coming soon), Aftermarket switches in stock dash blanks, Sony Head Unit, Illuminated 4x4 switch mod
    The speedo's are off from the factory, so your problem might be an extension of the original issue. There's some posts about the speedo if you search for them.
     
  3. Dec 29, 2010 at 6:26 AM
    #3
    buddywh1

    buddywh1 Well-Known Member

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    Philly PA
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    I found almost the same thing when I put on my 265/75 tires. The odo was accurate with the OE tires and the speedo was 'optimistic' (read faster than I was actually going). With the new tires, the odo is off and the speedo is almost dead accurate, as calibrated against GPS.

    Oh and do GPS distance traveled over a fairly long trip with few or no tight turns to reduce inherent GPS inaccuracy.

    http://www.gps-forums.net/accuracy-gps-measuring-travelled-distance-t8177.html
     
  4. Dec 29, 2010 at 7:10 AM
    #4
    05Moose

    05Moose Middle-Aged Member

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    In the snow (NorCal)
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    '05 4x4 DC LB SR5 (LSD & Tow Pkg), Timbrens, AAL, 5100s (.85), Owned: 12/3/04 Mods: Fog, Map/Dome Light, Illuminated 4wd Switch, Washable Cabin Air Filter
  5. Dec 29, 2010 at 7:26 AM
    #5
    hawkeye12

    hawkeye12 Go Pack Go!

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    Raleigh, NC
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    I figured my speedo is normally about 3 mph to fast.
     
  6. Dec 29, 2010 at 4:33 PM
    #6
    larryde09

    larryde09 Well-Known Member

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    Larry
    Rochester, NY
    Vehicle:
    (Traded-in) 06 2.7L 5-spd SR5 4x4
    K&N Intake, Magnaflow Cat-back Exhaust, Altezza Tail Lights, Pop&Lock Tailgate Lock, Extang Trifecta Tonneau Cover, PIAA foglights with stock switch, DrawTite Hitch, OBX Shift Knob, Hood Protector, Vent Visors, DIY step bars/sliders/running boards, DIY Bed Lights, DIY Running Board/Ground Lights, DIY Tailgate Electrical Box (12V socket, voltage and current gauges), DIY Internal Lighting (coming soon), Aftermarket switches in stock dash blanks, Sony Head Unit, Illuminated 4x4 switch mod
    Mine is as much as 5 mph off up around 65-70 mph. The problem is that it's not linear...i.e. it's accurate around 30 mph, off by about 2 mph at 45, and off as much as 5 around 65 mph. I actually complained about it under warranty but they said it was within limits...I assume their specification is at like 50 mph where it is in fact within spec.
     
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