Speedometer - AudiWorld Forums

Notices
A6 (C7 Platform) Discussion Discussion forum for the C7 Audi A6 produced from 2011
Sponsored by:
Sponsored by:

Speedometer

Reply

 
 
Old 05-25-2014, 09:14 AM
  #1
AudiWorld Member
Thread Starter
 
Join Date: Apr 2014
Posts: 114
Default Speedometer

Why is my speedometer off by two or three miles higher?
My radar detector in my other three cars is spot on but in the Audi A6 is is off. Very annoying.
537playing is offline  
Reply With Quote
Old 05-25-2014, 09:57 AM
  #2
AudiWorld Member
 
Join Date: Dec 2013
Location: Ontario, Canada
Posts: 276
Default

don't lose your hair over it. this is normal.
Superfly_A6 is offline  
Reply With Quote
Old 05-25-2014, 03:46 PM
  #3
AudiWorld Member
 
Join Date: Jul 2011
Location: Canada
Posts: 530
Default

All German cars I owned in the past are like that. They purposely set the speedometer 2 to 3 miles higher so you are always under posted speed limit if you drive at the limit. In my old Merc I can press a few buttons on and it can show the real speed and a whole bunch of other technical info on HVAC display.
qqq1970 is offline  
Reply With Quote
Old 05-25-2014, 06:03 PM
  #4
AudiWorld Super User
 
snagitseven's Avatar
 
Join Date: Jul 2001
Location: SE MA
Posts: 13,786
Default

Also, it's likely your computer MPG will read high as well. That one however, unlike the speedometer, can be adjusted with the VCDS (Vag-Com) cable and software.
snagitseven is offline  
Reply With Quote
Old 05-25-2014, 09:54 PM
  #5
AudiWorld Senior Member
 
DeerHunter's Avatar
 
Join Date: Nov 2012
Location: Edmonton, AB
Posts: 1,055
Default

Tangential question: Has anyone been able to use VAG-COM to enable GPS-derived speed in the Nav screen? Even the cheaperst Garmin has this capability and it would be a useful option for us optimistic German types.
DeerHunter is offline  
Reply With Quote
Old 05-26-2014, 04:03 AM
  #6
AudiWorld Member
 
TJKs '02 2.7T's Avatar
 
Join Date: Sep 2004
Location: Family and Photography
Posts: 257
Default

I also noticed that my speedometer reads around 2-3 MPH below what my Waze App is reporting...probably better this way versus under reporting the speed. However, more annoying is the MPG errors...my '02 A6 was always off by at least 2 MPG and after my first reading on my new '13 A6 it came in again at 2 MPG over the actual.

The good part though is that I attained 25.8 MPG...better than I ever got on my prior Audi over 10 years...there have been times where it is shown on the "Short-Term" getting 34 MPG over a trip.
TJKs '02 2.7T is offline  
Reply With Quote
Old 05-26-2014, 04:51 AM
  #7
AudiWorld Super User
 
snagitseven's Avatar
 
Join Date: Jul 2001
Location: SE MA
Posts: 13,786
Default

Originally Posted by TJKs '02 2.7T View Post
I also noticed that my speedometer reads around 2-3 MPH below what my Waze App is reporting...probably better this way versus under reporting the speed. However, more annoying is the MPG errors...my '02 A6 was always off by at least 2 MPG and after my first reading on my new '13 A6 it came in again at 2 MPG over the actual.

The good part though is that I attained 25.8 MPG...better than I ever got on my prior Audi over 10 years...there have been times where it is shown on the "Short-Term" getting 34 MPG over a trip.
As I mentioned a couple of posts ago, the DIS MPG consumption display can be adjusted to more closely match your real world calculation with VCDS:

Correct Consumption in DIS program
[17 - Instruments] [Adaptation - 10]
Look about 20 items down on the drop-down list for "Correct Consumption" and select it
Change 100 to xxx
Example - if your DIS is consistently off by 7% to your actual calculated mpg:
You RAISE the number to the percentage if DIS is OVER reporting mpg (i.e. 107)
You LOWER the number to the percentage if DIS is UNDER reporting mpg (i.e. 93)
snagitseven is offline  
Reply With Quote
Old 05-26-2014, 04:55 AM
  #8
AudiWorld Super User
 
snagitseven's Avatar
 
Join Date: Jul 2001
Location: SE MA
Posts: 13,786
Default

Originally Posted by DeerHunter View Post
Tangential question: Has anyone been able to use VAG-COM to enable GPS-derived speed in the Nav screen? Even the cheaperst Garmin has this capability and it would be a useful option for us optimistic German types.
I've not seen any, probably because there's no MMI software code to support the feature.
snagitseven is offline  
Reply With Quote
Old 05-26-2014, 07:27 AM
  #9
AudiWorld Senior Member
 
twentysevenlitres's Avatar
 
Join Date: Aug 2006
Location: Melbourne, Victoria, Australia
Posts: 853
Default

Speedos reading over actual speed is a design rules thing.
In most countries speedos are allowed to have an error of 10% bit must not read under the stated speed.
Most manufacturers err on the side of caution and have to them read slightly over.

Also saves on any litigation issues ("but my speedo said I was doing 55 officer"!!).

Both my Audi's are a damn site more accurate than any of my GMH products in the past - 1-2% under vs 8% under - no wonder I'm always overtaking Falcons and Commodores on the freeway...

Excerpt from Australian Design Rules:
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
That's actually 10% + 4km/h, which is even further out (14% at 100km/h)

edit: bold = corrections of tense

Last edited by twentysevenlitres; 05-26-2014 at 03:03 PM.
twentysevenlitres is offline  
Reply With Quote
Old 05-26-2014, 09:00 AM
  #10
AudiWorld Member
 
Join Date: Dec 2013
Posts: 309
Default

I think you may be reversing Speed reading with Odometer reading. Odometers are not permitted to read high. That is--they cannot indicate you have traveled 105miles when you only went 100 (that would reduce your warrantee for one thing). But the Speedometer reads a few mph higher than you are actually going. When I read 75mph, my GPS says I'm only doing 72. That keeps you from unintentionally speeding.
dicktahoe is offline  
Reply With Quote
 
 
 

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
wantfryswiddat
TT (Mk1) Discussion
4
09-21-2015 05:55 AM
MplsAvant
A4 (B5 Platform) Discussion
2
06-28-2001 06:24 AM
SantorinA4
A4 (B5 Platform) Discussion
11
03-30-2001 03:35 PM
hrana [AW]
A4 (B5 Platform) Discussion
0
01-06-2001 05:54 AM
1.8TQ99.5
A4 (B5 Platform) Discussion
3
04-03-2000 05:16 PM

Thread Tools
Search this Thread
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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -8. The time now is 03:43 PM.


 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: