Speedometer displays slower than car

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Re: Speedometer displays slower than car

Postby floppyrod84 » Tue Nov 13, 2012 1:01 pm

Also, speedometers are 10% too fast by design. This includes digital displays.

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Re: Re: Speedometer displays slower than car

Postby dmcconachie » Tue Nov 13, 2012 6:36 am

Sahirsiddiqui wrote:My experience is that both Waze (& my old Garmin GPS) show speeds almost exactly 10km/hr slower than my actual speed.

"Actual" measured by? If your car then this is normal and waze will actually be closer to your actual speed.

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Re: Re: Speedometer displays slower than car

Postby dmcconachie » Sat Nov 10, 2012 8:11 pm

islupepa wrote:One of the reason for displaying wrong speed could be this conversion bug...http://world.waze.com/forum/viewtopic.p ... conversion

Firstly, it's not displaying the wrong speed. As mentioned above, your car almost definitely overstates the speed.
Secondly that conversion bug creates at most a rounding error. It's only noticeable because it means certain integer values are not displayed. Certainly not enough to be perceptible though!

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Re: Speedometer displays slower than car

Postby crazed_out » Sat Nov 10, 2012 5:04 pm

This is true! A speedometer in a car is supposed to show that you're going faster than you really are. As much as up to 10%, but it' very different from make to make. Trucks (lorries) and busses have a speedometer that are much more precise than cars. Hence the reason for you driving and getting a truck or bus up close behing you. In my Volvo the difference is 5 km/h up to about 50 km/h then as much as 10 km/h between 70 and 120, after that I don't know because we're not allowed to go faster in Sweden. 8-)
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Speedometer displays slower than car

Postby BlazeTool » Tue Nov 13, 2012 12:42 pm

If you want to know your "actual" speed, take your car to a mechanic that will calibrate and certify the speed. (In the States, AAA will certify speedometers).

Slight changes in tire size can make a significant change in speedometer readings.
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Re: Speedometer displays slower than car

Postby AlanOfTheBerg » Tue Nov 13, 2012 3:48 pm

In the 25-40 range, Waze and my Fusion align nearly perfectly, taking into account slight variations due to instantaneous changes on accel/decel.
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