Last post on Oct 01, 2013 at 3:03 PM
You are in the BMW 3-Series
What is this discussion about?
BMW 3 Series
#13 of 29 Re: check this out... [idoc2]
Mar 02, 2008 (1:02 pm)
Its(sic) really totally unacceptable that my BMW's speedometer is far less accurate than my wife's Honda minivan or my 1998 Maxima. Using two GPS units my BMW consistently indicates a speed about 7% faster than true speed whereas the speedometers in the other two cars are dead on. Despite BMW justification there is really no excuse for such a basic inadequacy.
It's good to know that you don't sweat the small stuff.
Your last name isn't Monk, is it?
#14 of 29 Re: check this out... [kdshapiro]
Mar 02, 2008 (5:08 pm)
Of course you're correct, but I always have the choice of replacing with OEM's. Nevertheless, on my wife's minivan and obviously on my 1998 Maxima I've gone thru several sets of tires (and use snow tires in the winter) and it hasn't made a noticeable difference in the speedo accuracy. I suspect that tire manufactures have industry standards with regards to dimensions when they produce tires of a specific size. Even if they don't, with my BMW I have no idea which if any available tires would exactly offset the poor calibration of the speedo as it came from the factory.
#15 of 29 Re: check this out... [roadburner]
Mar 02, 2008 (5:32 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.
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.
#17 of 29 Re: check this out... [idoc2]
Apr 16, 2008 (12:53 pm)
If that is the case it probably saved me some major $ on speeding tickets.
#18 of 29 Re: check this out... [widriver2]
Apr 16, 2008 (1:48 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.
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.
Dec 10, 2009 (3:26 pm)
my wife's BMW 328i speedometer is off as well. When actually traveling 70mph it reads 75. The odometer is off too. The dealership assured me the two are not connected, but I doesn't matter. According to BMW customer service I can travel 45,000 miles and my odometer will read 50,000 thus ending my warranty. They refuse to correct this problem.
#21 of 29 Re: odometer [bmwlemon]
Jan 29, 2012 (5:35 pm)
I am sure everyone is sleeping soundly on this topic, after all the last post goes back to 2009! That beside I do believe that assuming that the speedometer and the odometers are tracking their respective measure in a connected manner is just plain wrong. Odometers are set according to precise requirements defined by the department transportation and need to be calibrated according to actual mileage, hence the legal implications of frauds connected to resetting it by various means. To my knowledge the odometer has a hardwired cabling to the actual axle transmission sends power to. That is not necessarily the case with the speedometer where, as other have suggested, it may be BMW intention to dupe us to believe we are driving faster than we actually are. That is the case also for my 2008 335xi that clock between 4-5 miles faster than the GPS. I found no such discrepancy between the same GPS and my wife 2011 XC 60 Volvo. Also let's be clear, automotive magazines rely on vehicle outfitted with their highly precise measurement devices when reporting on actual vehicle performance so their data can be trusted and do not depend on the manufacturer onboard dials.
#22 of 29 Speedometer inaccuracy
Jan 29, 2012 (5:44 pm)
Forgot to mention. For what I could tell watching the video posted online the car speed record clocked last year (2011) on German highways on a super modified 540i may have been biased by an inaccurate reading of the odometer. That is what they were showing on the video..the speedometer reaching 237 mph. I am not sure if taking ~ 5mph away, should have they relied entirely on the speedometer reading, would still qualify that vehicle as the speed record holder.
Lastly, speaking about modified vehicles I missed to identify any 3-series related post-market mod forum. I would be interested in such discussions given that I envision to retire my 2008 335xi but keep it as a tasteful track-modded spare car but I do not even know if the AWD model is really conducive to this type of alterations (sure I hope so, F-1 cars are in fact AWD these days). Any chance the gracious Hosts would be able to start one if none is currently ongoing?