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G30 (2017 - Current)
The next generation 5 Series, chassis code G30, arrives at dealers in February 2017. Looking like a scaled down 7 Series and riding on the CLAR platform, the new 5 Series will have a focus on lightweight and sporty performance. Engines options will come from BMW's new B family for the 530 and 540 and a turbocharged V8 for the M550i. Read more about the 2017 5 Series

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  #1  
Old 10-18-2019, 08:59 AM
BradN BradN is offline
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Waze vs. BMW speedo

This may be a silly question, as I would imagine the factory speedometer is accurate assuming the wheel/tire configuration didn't change, but I notice when using waze at highway speeds, it shows 3-4 mph slower than the speedo. Which one is likely the most accurate?

Thx!
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  #2  
Old 10-18-2019, 09:02 AM
DonnieZ DonnieZ is offline
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Waze vs. BMW speedo

Waze. All of my German cars, going back to my 1997 VW Jetta TDI, always read about 3-4 mph faster than actual.


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  #3  
Old 10-18-2019, 01:42 PM
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Agreed, Waze is going to be plus or minus 1 mph. BMW speedos are notoriously optimistic. It is a percentage off....so the mph is off more as you drive faster.
If you know someone with some hacking skills, you can adjust the percentage back in the ECU. I had this done on my E39 a few years ago. He showed me the code...BMW actually has an additive of inaccuracy built in intentionally! So he just dialed it back. They've done it this way for 20+ years. I would assume this adds additional miles than actual on the car as well.

It's stupid really. I rent cars all the time and the Japanese cars are right on the money.
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Old 10-18-2019, 01:52 PM
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Tradition has it that the German Standards Institute Deutsches Institut für Normung - DIN - required that one traveling at the indicated speed limit not be liable to a citation for speeding.

The EU / ECE standards are different. See the Wikipedia article Speedometer
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Old 10-18-2019, 02:49 PM
Markst Markst is offline
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The speedometer inaccuracy does not transfer to the odometer. A more precise counter is used for that.
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Old 10-18-2019, 02:50 PM
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Quote:
Originally Posted by BradN View Post
This may be a silly question, as I would imagine the factory speedometer is accurate assuming the wheel/tire configuration didn't change, but I notice when using waze at highway speeds, it shows 3-4 mph slower than the speedo. Which one is likely the most accurate?

Thx!
Ditto everyone above. Your speedometer is calibrated according to the European regulation: UN ECE Regulation 39.

You can google the above for all the fine print of the regulation.
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Old 10-18-2019, 07:21 PM
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The above answers are correct, and I for one am grateful. My 540 is so darn quiet, and the speed builds so effortlessly, that it's easy to find myself going 10 mph quicker than planned. I have my iDrive Speed Alert set to 85 mph for that purpose. And on long trips I use cruise control a lot - setting the system to 82 equals a real world speed of 79, per Waze. That's kept me out of trouble.
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Old 10-19-2019, 01:58 AM
nrh1703 nrh1703 is offline
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Depending on fitted options it's handy that you can adjust the speed limit adjustment, i.e. the cruise speed or limiter speed can be automatically set to a value higer or lower than the detected speed limit. I've got mine set to +4mph which takes into account the speedo under reading plus a little. This isn't via coding, just in settings;
My Vehicle > Vehicle settings > Speed Limit Assist > Adjust suggestion
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Old 10-19-2019, 12:12 PM
n1das n1das is offline
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Internally, the speedometer is accurate with stock rims and tires. The indicated speed is biased slightly high by design to comply with the UN ECE regulation which states that a speedometer can never under-report the true speed of the vehicle for range of rim and tire sizes the vehicle is designed for. The speedometer is allowed read dead-on or high, never low. The indicated speed reads slightly high by design.

My VW TDIs I owned years ago were like this too.

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Old 10-20-2019, 02:47 AM
dephead2004 dephead2004 is offline
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I work on the basis of adding 10% to get the true reading. Never been caught yet
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  #11  
Old 10-21-2019, 07:42 AM
nlaak nlaak is offline
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Quote:
Originally Posted by BradN View Post
This may be a silly question, as I would imagine the factory speedometer is accurate assuming the wheel/tire configuration didn't change, but I notice when using waze at highway speeds, it shows 3-4 mph slower than the speedo. Which one is likely the most accurate?

Thx!
My M5 is off by < 2 MPH from 25MPH to 90MPH (which is as far as I tested it) when compared to my phone. Generally cars do read higher on the speedo than in reality, because if they did the opposite the manufacturer could be liable for you getting a speeding ticket.
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Old 10-22-2019, 09:01 AM
BradN BradN is offline
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Interesting. Thanks for all the feedback!!
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  #13  
Old 10-22-2019, 05:44 PM
Glaird Glaird is offline
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My experience, 1.5M mies, has demonstrated that every car is different in accuracy. However, I have long ago, developed an Excel spreadsheet, in increments of miles per hour, from 0 to 200, and hundredths of seconds to cover said mile at said speed. I have used that spread sheet and very accurate stop watches, over multiple mile marker distances, to rule out misplaced single markers. I did this for self protection, for the very reasons discussed in the above posts.
Since 1999, the last 5 cars that I have owned, 3 BMWs, 1 Lexus, 1 Toyota all are accurate to the mph of actual speed. Curiously, my 550, with one size larger rear tires than stock, is still accurate within 1 mph, to actual speed. (Which poses the question, how does BMW calculate speed, if the ABS teeth on the rear disks are turning slower? But, that is a discussion for a different forum category.)
Having made and retired from a career as a Software Engr., I would put far more stock in the display on the car, than some app, written by Apple. I suspect, if you read the use agreement for Waze, there will be the phrase "for entertainment" in there somewhere, to cover their butts, should someone actually depend on the app.
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Old 10-22-2019, 07:43 PM
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Quote:
Originally Posted by BradN View Post
This may be a silly question, as I would imagine the factory speedometer is accurate assuming the wheel/tire configuration didn't change, but I notice when using waze at highway speeds, it shows 3-4 mph slower than the speedo. Which one is likely the most accurate?

Thx!
There are a few coding tools out there you can buy that will allow you to change the speedometer to register accurately. I happen to be using a Carly, but there are others. I have a dongle I connect to the OBD port that allows me to establish a wifi connection to my phone. Then I fire up the Carly app. There are probably a 100 parameters you can modify. I can also reset the ECU for a new battery when it is time for a replacement. As a multi-BMW owner, it is priceless for me.
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Old 10-22-2019, 08:42 PM
WillyG WillyG is offline
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Waze speedometer accuracy

I have a 1996 840ci, 1990 328i, 2000 Audi A6, 2014 MBZ GLK, and 2018 VW Passat and none of them show the same as WAZE. I think it's got something to do with the satellite signal. Sometimes it'll show 1-2 miles less, other times it'll show 2-3 miles over.
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Old 10-22-2019, 09:32 PM
mach250 mach250 is offline
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Mine has been 2-3 mph fast on both the waze app and those radar speed signs. New tires are 40 front and 35 rear and it reads spot on now, just screwed up getting soft side-walled continentals...won't get this brand again.
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Old 10-23-2019, 12:03 PM
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Mine has been 2-3 mph fast on both the waze app and those radar speed signs. New tires are 40 front and 35 rear and it reads spot on now, just screwed up getting soft side-walled continentals...won't get this brand again.
Which continentals? I have used both DW and later DWS and found the same...soft side walls. Great ride, but steering feel or precision was lacking. I would turn in, and it was like the car reacted a split second later. I got used to it, but once I switched to Michelin Pilot Sport I realized what I had been missing. Also, the DW and DWS wore rather quickly.
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Old 10-23-2019, 06:39 PM
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Waze's speed is based on position data that is already a couple seconds old, so it'll be less accurate for instantaneous speed (it would be useless for determining 0-60, for example).

If you're cruising at a constant speed (and you have a good GPS fix), Waze should be accurate.
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