BMW X5 and X6 Forum 2014-Current
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Post Reply
 
Thread Tools Search this Thread
      02-03-2017, 11:50 AM   #1
slampert
Private First Class
159
Rep
168
Posts

Drives: 2022 iX50
Join Date: Feb 2016
Location: Los Angeles, CA

iTrader: (0)

Speed Variance from Waze

I've noticed that the speedo on my (stock) '16 M-sport is consistently reading 2 to 4mph faster than my speed as reported on the Waze iPhone app. The variance increases as my speed increases.

In my last ride (a 2011 JGC Summit) Waze and the truck speed were identical. My X5 has only 3500 miles but I'm not happy at the possibility of accumulating close to 5% of "phantom mileage" !

Could it be time for a visit to the dealer for a speedo calibration test....?!?!

Anyone else seeing this ?
Appreciate 0
      02-03-2017, 12:07 PM   #2
Kzang
Major General
Kzang's Avatar
3222
Rep
5,058
Posts

Drives: 2015 X5 35i Msport SG
Join Date: Jun 2009
Location: East Coast

iTrader: (0)

From my experience all the BMW's I've had the speedometer is usually 3 to 4 miles faster than the actual. I'm guessing it is the same with the F15.
__________________
2015 F15 X5 35i Msport Space Grey M Performance parts MPPK, MPE
Appreciate 0
      02-03-2017, 12:59 PM   #3
Terp335
First Lieutenant
115
Rep
381
Posts

Drives: E90 2011 335i M Sport
Join Date: Jun 2011
Location: No VA

iTrader: (0)

Normal
Appreciate 0
      02-03-2017, 04:12 PM   #4
X5M50D
Captain
United Kingdom
442
Rep
781
Posts

Drives: X7 M50d
Join Date: Jan 2017
Location: Middlesex, UK

iTrader: (0)

Quote:
Originally Posted by Terp335 View Post
Normal
Yep have the same on my Jag.
You'll find this is normal on most cars.
Appreciate 0
      02-03-2017, 10:23 PM   #5
98PoleCat
Private
98PoleCat's Avatar
14
Rep
65
Posts

Drives: 2015 X5 35d
Join Date: Apr 2016
Location: KC

iTrader: (0)

Like others have said, this is normal. Odometer is accurate, though, so no worries about your "phantom" mileage.
Appreciate 0
      02-03-2017, 10:39 PM   #6
MysticBlue
Lieutenant Colonel
369
Rep
1,887
Posts

Drives: '20 M5C, '09 M3 DCT Coupe
Join Date: Apr 2008
Location: Eastern Oregon... They call 'em rigs here

iTrader: (0)

It is normal for BMW's and many other cars to have speedos reading at least 2% high. Some are as much as 5% high. Regulations in Europe dictate the accuracy of speedometers be within a certain percentage, plus or minus, but the minus side is basically zero. In other words, they can be a little off on the over but they cannot be even a little off on the under, so to play it safe, they tend to calibrate them with a few percent fudge factor on the over. Note that this is a percentage, so if yours is 3% off for instance, 60mph would read about 62. 90 would read closer to 93. Anything that is GPS based will most likely be very accurate.
__________________
M5C 20% tint, Xpel full front, partial sides and rear. Spacers, 15mm front, 12mm rear. Turner Motorsport Oil Cooler Guard.
M3: Active Autowerke filter, Dinan underdrive pulley, Dinan full exhaust and software, 3.45 Differential, Springs, Brakes, Dinan/HRE wheels, 275/30-19 w/10mm spacer, 295/30-19 w/3mm spacer, painted front reflectors, 30% tint, Escort 8500i & Lidar Jammer, LUX H8 V5 halos, Euro rear foglights, 3M ClearBra.
Appreciate 0
      02-03-2017, 11:16 PM   #7
alphaod
Mmmmm…
alphaod's Avatar
United_States
1148
Rep
2,426
Posts

Drives: F15
Join Date: Oct 2011
Location: New York

iTrader: (0)

Garage List
It's normal. 80 mph on the speedo is 78 on my GPS.

It doesn't really bother me the slightest except maybe I'm wondering if my odometer says I've done 50,000 miles (when the warranty lapses) does it mean in truth I've only done 48750 miles?
__________________
2015 BMW X5 xDrive50i
BMW CCA 509766
Appreciate 0
      02-04-2017, 02:35 AM   #8
Gilly1964
Private First Class
99
Rep
188
Posts

Drives: F15 30d MSport
Join Date: Jan 2014
Location: UK

iTrader: (0)

But what if the 'miles' part of the equation was right but 'BMW hours' are shorter than Universal Time? Mr Einstein would have something to say about your relative velocity through space-time that even a good traffic lawyer couldn't refute...
Appreciate 0
      02-04-2017, 03:28 AM   #9
theove
Private First Class
88
Rep
141
Posts

Drives: X5 4.0E
Join Date: May 2016
Location: Netherlands

iTrader: (0)

In the EU there is a law that says that a speedometer must always give a higher value than the real speed:

Quote:
5.3.
The speed indicated shall not be less than the true speed of the vehicle. At the test speeds specified in paragraph 5.2.5 above, there shall be the following relationship between the speed displayed (V1) and the true speed (V2).
0 ≤ (V1 – V2) ≤ 0,1 V2 + 4 km/h
http://eur-lex.europa.eu/legal-conte...247290&from=EN
Appreciate 0
      02-04-2017, 06:15 PM   #10
MysticBlue
Lieutenant Colonel
369
Rep
1,887
Posts

Drives: '20 M5C, '09 M3 DCT Coupe
Join Date: Apr 2008
Location: Eastern Oregon... They call 'em rigs here

iTrader: (0)

Quote:
Originally Posted by alphaod View Post
It's normal. 80 mph on the speedo is 78 on my GPS.

It doesn't really bother me the slightest except maybe I'm wondering if my odometer says I've done 50,000 miles (when the warranty lapses) does it mean in truth I've only done 48750 miles?
Don't need to worry about that. The mph "calibration" comes after the odometer extracts the distance part of the equation. The odometers have to be correct or the manufacturers would get sued. Not to mention various laws and regulations around the world. Plus Einstein and the space time continuum.
__________________
M5C 20% tint, Xpel full front, partial sides and rear. Spacers, 15mm front, 12mm rear. Turner Motorsport Oil Cooler Guard.
M3: Active Autowerke filter, Dinan underdrive pulley, Dinan full exhaust and software, 3.45 Differential, Springs, Brakes, Dinan/HRE wheels, 275/30-19 w/10mm spacer, 295/30-19 w/3mm spacer, painted front reflectors, 30% tint, Escort 8500i & Lidar Jammer, LUX H8 V5 halos, Euro rear foglights, 3M ClearBra.
Appreciate 0
      02-04-2017, 06:50 PM   #11
slampert
Private First Class
159
Rep
168
Posts

Drives: 2022 iX50
Join Date: Feb 2016
Location: Los Angeles, CA

iTrader: (0)

Good stuff, thanks guys!

I would not have guessed that the odometer and speedo function independently, or if they don't, that the odometer is designed to account for the inaccuracy of the speedo so as to yield accurate mileage...
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 04:57 PM.




xbimmers
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST