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02-09-2018, 06:11 PM | #1 |
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Speedometer accuracy
So I noticed today that my speed on the heads up display and what was showing on the Waze app were out of sync. I engaged cruise control and my heads up was consistently 3mph higher than the app. Later I downloaded a speedometer app, performed the same test. Heads up said 83mph, app said 80mph.
I suspect most of us here will say trust BMW not an app, but a google search brought me to a GMC forum which said trust the app and not GMC, lol! :
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02-09-2018, 07:21 PM | #2 |
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I have the exact same thing. BWM displays slightly higher speed than actual on purpose to guarantee the compliance of speed limits.
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2011 535i xDrive Black/Black, Michelin PS AS 4
2014 435i RWD Convertible Service Manual: www.newtis.info Part: http://www.realoem.com |
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02-09-2018, 08:51 PM | #3 | |
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02-10-2018, 06:37 AM | #4 | |
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Regardless, is there a fix for this? Overestimating speed is like my wife setting her cars clock 5 min fast so she is on time. It makes no sense and triggers me!
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02-11-2018, 08:41 PM | #5 |
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The speedo reads high - most brands probably are and BMW's have been known to be for decades. Porsche too. This is so that no one can sue the manufacturer when they get a speeding ticket.
My E90 could be coded to show a "true speed" indicator digitally on the cluster. On my 1998 E39 I had to use the OBC average speed indicator - reset it and the first speed that pops up was "true". Note that the odometer is correct. If you find a "measured mile" or "measured kilometer" on a local highway, you'll find your odometer counts the distance correctly but the speedo reads low if you add a stopwatch into the experiment. |
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02-11-2018, 09:37 PM | #6 | |
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02-12-2018, 12:33 PM | #7 |
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