Home Forums Articles How To's FAQ Register
Go Back   Xoutpost.com > BMW SAV Forums > X5 (E53) Forum
Arnott
User Name
Password
Member List Premier Membership Search Today's Posts Mark Forums Read

Xoutpost server transfer and maintenance is occurring....
Xoutpost is currently undergoing a planned server migration.... stay tuned for new developments.... sincerely, the management


Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 12-31-2018, 10:23 PM
wpoll's Avatar
Member
 
Join Date: Sep 2015
Location: South Island, New Zealand
Posts: 2,796
wpoll will become famous soon enough
Whistle Speedo offset fix...

In a thread about re-coding the temp gauge to be more representative of actual engine temps, the discussion turned to fixing the factory configured speedo offset.

I've been researching this a little and while there is a lot of info. on doing this on other BMW platforms, there's not much for the e53. Knowing that the e53 was based on the e39, I researched e38/e39 solutions. Having downloaded my e53 IKE EEPROM contents and reviewed the hex data dump, I can confirm that it seems that there may be some similar speedo offset data in the same locations as for the e38/e39 platform: -

0x00b8 0f
0x00b9 33
0x00ec f0
0x00ed cc

0x0260 0f
0x0261 33
0x0294 f0
0x0295 cc

I still need to confirm that these values are in fact the speedo offset, how the offset is represented and what checksums are involved. And then what should be entered to remove the offset...

Watch this space...
__________________
Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
Reply With Quote

Sponsored Links

  #2  
Old 12-31-2018, 10:44 PM
Member
 
Join Date: Mar 2016
Location: Saskatchewan Canada
Posts: 882
80stech is on a distinguished road
__________________
1988 325is (purchased new)
2004 X5 3.0 (new to me) 2005 X3 2.5 (new to wife)
Reply With Quote
  #3  
Old 12-31-2018, 10:59 PM
Emory39's Avatar
Member
 
Join Date: Nov 2014
Location: Boise ID
Posts: 607
Emory39 is on a distinguished road
Quote:
Originally Posted by wpoll View Post
0x00b8 0f
0x00b9 33
0x00ec f0
0x00ed cc

0x0260 0f
0x0261 33
0x0294 f0
0x0295 cc

so replacing the first two number of that hex line should do the trick?
__________________
E36 M3 95-sold
E30 318i 91-sold
E39 528i 00-rebuild at136K -sold
E36 M3 98-sold
E53 X5 4.4 05-the beast
E53 X5 3.0 5M/T 01-sold-coming back ETA 22SEPT Its back
R56 Mini Cooper S 07-sold. I should have keept it
E83 X3 3.0-the wife's
E36 M3 97 - The new project - sold
https://www.youtube.com/channel/UCcI..._as=subscriber
Reply With Quote
  #4  
Old 12-31-2018, 11:17 PM
Member
 
Join Date: Jun 2017
Location: New zealand
Posts: 78
Ohsoslow is on a distinguished road
How much of an offset are you going for... would be nice to half it.. save $35 every 1000ks
__________________
2004 X5 3.0d

New Zealand
Reply With Quote
  #5  
Old 01-01-2019, 12:35 AM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 4,640
andrewwynn is on a distinguished road
Is the offset a % or like a slope eg 42 @ 49 and 73 @ 70 etc.
__________________
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)
Reply With Quote
  #6  
Old 01-01-2019, 12:52 AM
Member
 
Join Date: Mar 2016
Location: Saskatchewan Canada
Posts: 882
80stech is on a distinguished road
My E30 was sloped up to an extra 6-8 km at a 100 then back down to be dead on at 200 km/hr. This may or may not be the same with the E53, I think some sluthing and testing may be in order! Back in the day the dealer told me that the speedo was calibrated to be accurate at 200 km and as long as it was within 10% in between there was no problem.
__________________
1988 325is (purchased new)
2004 X5 3.0 (new to me) 2005 X3 2.5 (new to wife)
Reply With Quote
  #7  
Old 01-01-2019, 01:52 AM
wpoll's Avatar
Member
 
Join Date: Sep 2015
Location: South Island, New Zealand
Posts: 2,796
wpoll will become famous soon enough
Quote:
Originally Posted by Emory39 View Post
so replacing the first two number of that hex line should do the trick?
No - it's more complicated than that. But only slightly so.
__________________
Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
Reply With Quote
  #8  
Old 01-01-2019, 01:52 AM
wpoll's Avatar
Member
 
Join Date: Sep 2015
Location: South Island, New Zealand
Posts: 2,796
wpoll will become famous soon enough
Quote:
Originally Posted by Ohsoslow View Post
How much of an offset are you going for... would be nice to half it.. save $35 every 1000ks
Tax evasion...? Who would do that...?
__________________
Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
Reply With Quote
  #9  
Old 01-01-2019, 02:19 AM
wpoll's Avatar
Member
 
Join Date: Sep 2015
Location: South Island, New Zealand
Posts: 2,796
wpoll will become famous soon enough
Quote:
Originally Posted by andrewwynn View Post
Is the offset a % or like a slope eg 42 @ 49 and 73 @ 70 etc.
I was hoping it was a simple ratio, with the two values being the numerator and denominator of the ratio - so in effect a percentage change factor. But as suggested by 80stech, there may be some other mechanism here I have yet to discover.

The simple ratio used in the e46 is easy to follow (thanks to TerraPhantm at e64 fanatics): -

0x25 = 37(dec)
0x23 = 35(dec)

37/35 = 1.057, or a 5.7%

But is seems our e53 is more complex and BMW love to store simple values as complex sets of integers. I'm try to figure out what they have done here in the e53 (or at least on mine - I'll get the version of the IKE next time I connect up).

I'm going to have to get setup with NCS Dummy to get a dump of the module functions and to confirm the hex locations. I have NCS Expert but have never bothered with NCS Dummy - now seems a good time.. :-)
__________________
Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
Reply With Quote
  #10  
Old 01-01-2019, 03:27 AM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 4,640
andrewwynn is on a distinguished road
It's easy enough to get a few reference points of actual vs speedo speed and figure out if it's a linear ratio or a curve as mentioned above (where actual speed becomes speedo speed at 200kph).

I can pull up actual speed on my scanner or the hidden menu and compare at a few different indicated speeds. (I often describe some action I've done in my x5 at some speed and will usually say "I drove through this curve at an indicated 75"
__________________
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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 On
Pingbacks are On
Refbacks are On





All times are GMT -4. The time now is 06:53 AM.
vBulletin, Copyright 2019, Jelsoft Enterprises Ltd. SEO by vBSEO 3.6.0
2017 Xoutpost.com. All rights reserved. Xoutpost.com is a private enthusiast site not associated with BMW AG.
The BMW name, marks, M stripe logo, and Roundel logo as well as X3, X5 and X6 designations used in the pages of this Web Site are the property of BMW AG.
This web site is not sponsored or affiliated in any way with BMW AG or any of its subsidiaries.