05-12-2016, 03:04 PM | #15 | |
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05-12-2016, 03:07 PM | #16 |
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05-12-2016, 03:33 PM | #17 |
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Mine is def off my a mph or two. Heck even my digital one seems to read about .5 mph faster than any speed radar signs I pass on the road.
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05-12-2016, 03:47 PM | #18 | |
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Now if there is a difference of 5 or 10 MPH then you have an issue but go with your car not the remote device. By the time the device reads and displays your speed it may already be different then what your display tells you at the instant that you look.
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05-12-2016, 03:58 PM | #19 |
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AFAIK speedmeters are always set to overestimate rather than underestimate. I mean, each measuring device has a certain amount error, both due to intrinsic inaccuracies and due to external influences (e.g., tire pressure).
The manufacturers set up speedometers in such way, that whatever the error comes up to be (within reasonable limits), the shown speed will be same or lower than the actual speed. This is to protect the manufacturer from drivers suing them saying "the speedometer showed I was at speed limit and I got ticketed anyway". No one is going to (successfully) sue for damages because "the speedometer was shoing 70 mph all the time, yet it took me as much as 32 minutes to drive 35 miles" |
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05-12-2016, 04:03 PM | #20 |
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As I recall it (and checked against the source of all knowledge, Wikipedia) the international standards for speedometers is they must 1) never display an indicated speed "slower" than actual speed and 2) must not show an indicated speed of greater than 110% + 4kph of actual speed at certain "check speeds".
Various nations may have various or additional standards but nearly all of them say the speedometer can never show less than actual speed, but can by off in the other direction by quite a bit. The example given on Wikipedia for the UK says "For example, if the vehicle is actually travelling at 50 mph, the speedometer must not show more than 61.25 mph or less than 50 mph."
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05-12-2016, 04:06 PM | #21 |
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"Son, do you know how fast you were going?"
"About 0.5 bar." See? It works! |
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05-12-2016, 04:07 PM | #22 | |
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05-12-2016, 04:41 PM | #23 | |
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Nein Nein Nein Nein |
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05-12-2016, 04:45 PM | #24 | |
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I may be wrong though |
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05-12-2016, 05:07 PM | #25 |
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Until you guys change from 17 to 18" wheels with the same tire sidewall... or does it not work that way anymore?
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05-12-2016, 05:08 PM | #26 | |
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05-12-2016, 05:15 PM | #27 | |
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N00b question but how do you fix a speedo after going up an inch in wheels and getting wider tires?
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05-12-2016, 05:19 PM | #28 | |
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I will let somebody that knows what they are talking about field the real answer to this.
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