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Old 06-20-2019, 03:17 PM   #1
justanotherdrunk
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speedometer calibration

the latest android maps update finally includes the speed and speed limits so i wanted to check the accuracy of the car vs the app

i guess 1 mph deviation at 80 is decent

red means toooo fast!



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Old 07-09-2019, 01:55 AM   #2
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GPS itself wont be accurate too
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Old 07-09-2019, 01:37 PM   #3
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Fun and interesting to look at.
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Old 07-10-2019, 09:27 PM   #4
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Quote:
Originally Posted by toyotavios_11 View Post
GPS itself wont be accurate too
Here in Australia it will most likely be much more accurate that the speedometer. My speedometer shows 80 km/h at a GPS indicated 76 km/h. This agrees with the readings from the OBDII port using the Torque app.

Australian regulations say the speedometer must not show a speed lower than the correct speed, but may read high by up to 4% plus 4 km/h.

Does anyone know if it is actually possible to adjust the speedometer? The last time I touched a speedometer to recalibrate it was 20 years ago on a Jaguar. A previous owner had the trip meter repaired, and the repairer did not correctly reset the mechanical zero...
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Last edited by kevinj93; 07-10-2019 at 09:39 PM.
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Old 07-10-2019, 09:43 PM   #5
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Yes here too speedometers read higher than actual speed. Annoying. I can deal with a 1mph error (like OP shows and as I have verified on my own Yaris as well) but I've driven some cars where they were off by 4 mph or so. Really annoying. GPS is generally more accurate.
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Old 07-19-2019, 06:10 AM   #6
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Speedometers here in the U.K. may read up to 10% higher than actual. Never lower.
Thanks for posting the info. re G Maps speedometer. I didn't know it was finaly available. Now found in settings and activated.
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Old Yesterday, 02:26 PM   #7
justanotherdrunk
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Quote:
Originally Posted by pjon View Post
Thanks for posting the info. re G Maps speedometer. I didn't know it was finaly available. Now found in settings and activated.

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