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BMW 3-Series Speedometer Inaccuracy

19 messages,  Last post on Oct 26, 2009 at 12:05 PM

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#15 of 19 Re: check this out... [roadburner] by idoc2 Mar 02, 2008 (5:32 pm)
Replying to: roadburner (Mar 02, 2008 1:02 pm) No, but as always Dr. House we plebeian members greatly appreciate your concern for our well being and your beneficent sharing of automotive wisdom. Nevertheless, trivial to the apologists as it may be I still expect an accurate speedo.
#16 of 19 Well. . . by cdnpinhead Mar 02, 2008 (5:50 pm)
I'm going to have to throw in with the anal-retentive here (big surprise -- look at my moniker). I've also noticed that my various rental cars, as well as the one I drive every day (and have for 127K miles), display a speed that is dead-on in agreement with my Garmin. Even better, at the end of a 753 mile day, the Garmin and the odometer are within a fraction of a percent. I'm a happy camper.   Now, when I get my BMW, I'm led to believe that the speed itself can be all over the map but the odometer will be dead-on. Well, I expect (demand, actually) the odometer to be right, but wonder why the "logic" that applies to the speedometer doesn't to the odometer. Those tire changes will affect the odometer as well.   What's up?
#17 of 19 Re: check this out... [idoc2] by widriver2 Apr 16, 2008 (12:53 pm)
Replying to: idoc2 (Mar 02, 2008 10:45 am) If that is the case it probably saved me some major $ on speeding tickets. Replies to this message: 330cic (Apr 16, 2008 1:48 pm)
#18 of 19 Re: check this out... [widriver2] by 330cic Apr 16, 2008 (1:48 pm)
Replying to: widriver2 (Apr 16, 2008 12:53 pm) I am in agreement that Bimmers should not register inaccurate speeds on the speedometer. The tires that I have on the car are the Conti RFT's and are the correct size for the car. They are not custom. If I had larger or smaller diameter tires and wheels on the car, the yes, I would expect for the speedo to read inacurrately. My '03 4Runner is dead on with the GPS. Don't know why BMW would think it's acceptable to not have an accurate gauge.
#19 of 19 Speedo by upstatedoc Oct 26, 2009 (12:05 pm)
hate to beat a dead horse here, but has anyone found a solution to the speedo inaccuracies? Mine reads 4 mph over the real speed at highway speeds. Is there something to adjust w/ the cars computer? I think I know why the 3-series didn't make the "Top 10 Most Ticketed Cars" list, everyone is doing under the speed limit.

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