BMW M3 Forum
BMW M3 Forum BMW M3 Gallery BMW M3 Reviews BMW M3 Social Groups BMW M3 Chat M3Forum Sponsors >>
Loading


Mobile M3forum
Go Back   BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X) > BMW M3 Discussions > E46 M3 (2001-2006) > Coding and Tuning
Tire Rack Buy Winter Tires Now!
Not a member? Register Now!
Register Gallery All Albums Garage Search Today's Posts Mark Forums Read Calendar FAQ

Coding and Tuning Discuss all avenues of coding and tuning here!


Reply
 
Thread Tools Display Modes
Old Sun, Aug-21-2016, 12:31:27 AM   #1
TudiM3
Registered User
 
TudiM3's Avatar
 
Join Date: Aug 2012
Posts: 48
Reputation: 0 TudiM3 is on a distinguished road

United States




Default MSS54 Final drive changed to 4.45->limp mode.Please HELP!

Hi,

I searched for this but without succes.
I changed my rear differential to 4.45.
Now my SMG switched to limp mode and cannot switch gears.
DME in limp mode too and I cannot push full throttle.

Is there any solution to re-calculate gear ratios per gear or any other solution?

Thank You!
__________________
http://www.youtube.com/watch?v=w8cLyrNQX6A <- My E30 Touring with E46 M3 engine
Jump to top TudiM3 is offline   Reply With Quote
Sponsored Links
Register now and remove these ads
Old Sun, Aug-21-2016, 08:35:29 AM   #2
MartynT
Registered User
 
MartynT's Avatar
 
Join Date: Aug 2012
Posts: 579
In the garage:
Reputation: 0 MartynT is on a distinguished road

United Kingdom




Default Re: MSS54 Final drive changed to 4.45->limp mode.Please HELP!

Hi buddy,

Unfortunately you can't compensate for 4.45, 4.25 is the greatest final drive value the DME will accept so that's probably why you have the issue.

Flash back to your original read and the car should be happy for now or flash a modified original with the valve changed for 4.25 gears.
Jump to top MartynT is offline   Reply With Quote
Old Sun, Aug-21-2016, 12:41:29 PM   #3
TudiM3
Registered User
 
TudiM3's Avatar
 
Join Date: Aug 2012
Posts: 48
Reputation: 0 TudiM3 is on a distinguished road

United States




Default Re: MSS54 Final drive changed to 4.45->limp mode.Please HELP!

Quote:
Originally Posted by MartynT View Post
Hi buddy,

Unfortunately you can't compensate for 4.45, 4.25 is the greatest final drive value the DME will accept so that's probably why you have the issue.

Flash back to your original read and the car should be happy for now or flash a modified original with the valve changed for 4.25 gears.
Hi,
Thanks!

But i do not flash nothing yet.
I am interested about how can i calculate the gear ratio for 4.45 final drive or 4.25.
Because i don't know where is the map or table in the DME for this.
That's what i like to know.

And another question
SMG ECU has any software settings for vehicle speed vs rpm?
Or just the DME tells to the SMG what to do?

Thank You!
__________________
http://www.youtube.com/watch?v=w8cLyrNQX6A <- My E30 Touring with E46 M3 engine
Jump to top TudiM3 is offline   Reply With Quote
Old Sun, Aug-21-2016, 01:30:01 PM   #4
MartynT
Registered User
 
MartynT's Avatar
 
Join Date: Aug 2012
Posts: 579
In the garage:
Reputation: 0 MartynT is on a distinguished road

United Kingdom




Default Re: MSS54 Final drive changed to 4.45->limp mode.Please HELP!

Ah, my bad!

What version of software is your DME running?
Jump to top MartynT is offline   Reply With Quote
Old Sun, Aug-21-2016, 05:35:29 PM   #5
TudiM3
Registered User
 
TudiM3's Avatar
 
Join Date: Aug 2012
Posts: 48
Reputation: 0 TudiM3 is on a distinguished road

United States




Default Re: MSS54 Final drive changed to 4.45->limp mode.Please HELP!

Quote:
Originally Posted by MartynT View Post
Ah, my bad!

What version of software is your DME running?
No problem!
This is my version: 211322002101JD39
I can't find it in p0lar's list...
__________________
http://www.youtube.com/watch?v=w8cLyrNQX6A <- My E30 Touring with E46 M3 engine
Jump to top TudiM3 is offline   Reply With Quote
Old Sun, Aug-21-2016, 05:54:46 PM   #6
MartynT
Registered User
 
MartynT's Avatar
 
Join Date: Aug 2012
Posts: 579
In the garage:
Reputation: 0 MartynT is on a distinguished road

United Kingdom




Default Re: MSS54 Final drive changed to 4.45->limp mode.Please HELP!

0x1AB4 for 2101.

For 4.25 change 'DA' to 'FF'.
Jump to top MartynT is offline   Reply With Quote
Old Sun, Aug-21-2016, 08:48:10 PM   #7
TudiM3
Registered User
 
TudiM3's Avatar
 
Join Date: Aug 2012
Posts: 48
Reputation: 0 TudiM3 is on a distinguished road

United States




Default Re: MSS54 Final drive changed to 4.45->limp mode.Please HELP!

Quote:
Originally Posted by MartynT View Post
0x1AB4 for 2101.

For 4.25 change 'DA' to 'FF'.
Thank you!

But i am interested why it works if i change this DA value to FF?
And why it works only with 4.25?
If i am correct this adress is the first gear of smg.
Why not possible to make a working map to work with 4.45 final drive?

Thank you again!
__________________
http://www.youtube.com/watch?v=w8cLyrNQX6A <- My E30 Touring with E46 M3 engine
Jump to top TudiM3 is offline   Reply With Quote
Old Sun, Aug-21-2016, 09:23:07 PM   #8
MartynT
Registered User
 
MartynT's Avatar
 
Join Date: Aug 2012
Posts: 579
In the garage:
Reputation: 0 MartynT is on a distinguished road

United Kingdom




Default Re: MSS54 Final drive changed to 4.45->limp mode.Please HELP!

4.25 * 60 = 255. 255 in hex = FF
Jump to top MartynT is offline   Reply With Quote
Old Mon, Aug-22-2016, 12:43:10 AM   #9
terraphantm
Moderator
 
Join Date: Dec 2010
Posts: 11,298
In the garage:
Reputation: 11 terraphantm is on a distinguished road
Location: Philadelphia

United States




Default Re: MSS54 Final drive changed to 4.45->limp mode.Please HELP!

Quote:
Originally Posted by TudiM3 View Post
Thank you!

But i am interested why it works if i change this DA value to FF?
And why it works only with 4.25?
If i am correct this adress is the first gear of smg.
Why not possible to make a working map to work with 4.45 final drive?

Thank you again!
It's a single byte value. Maximum value you can store in a single byte is 0xFF (255). Conversion factor is x/60. 255 / 60 is 4.25, hence that's the maximum ratio the DME supports. It may be possible to change those bytes to words (and thus allow a value between 0 and 65535), but I haven't examined the code thoroughly to see if that would break anything else.

The other values that might be giving you issues are all the gear recognition factors

Try setting:

K_GANG_GRENZE1_2 to 120
K_GANG_GRENZE2_3 to 80
K_GANG_GRENZE3_4 to 50
K_GANG_GRENZE4_5 to 40
K_GANG_GRENZE5_6 to 32

K_S_GANG1_NV_MAX to 160
K_S_GANG1_NV_MIN to 148
K_S_GANG2_NV_MAX to 95
K_S_GANG2_NV_MIN to 85
K_S_GANG3_NV_MAX to 64
K_S_GANG3_NV_MIN to 58
K_S_GANG4_NV_MAX to 48
K_S_GANG4_NV_MIN to 42
K_S_GANG5_NV_MAX to 38
K_S_GANG5_NV_MIN to 34
K_S_GANG6_NV_MAX to 32
K_S_GANG6_NV_MIN to 28
K_S_GANG7_NV_MAX to 144
K_S_GANG7_NV_MIN to 135
__________________
Jump to top terraphantm is offline   Reply With Quote
Old Mon, Aug-22-2016, 12:06:42 PM   #10
cossie1
Registered User
 
Join Date: Dec 2013
Posts: 455
Reputation: 0 cossie1 is on a distinguished road

United Kingdom




Default Re: MSS54 Final drive changed to 4.45->limp mode.Please HELP!

What happens if you change DA to 0C ?
Jump to top cossie1 is online now   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

Forum Jump



All times are GMT. The time now is 06:51:53 PM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
M3Forum.com and M3forum.net is in no way sponsored, endorsed or affiliated by or with BMW NA / BMW AG or any of it's subsidiaries or vendors.
BMW and M3 (E90 M3 | E92 M3 | E93 M3 | E46 M3 | E36 M3 | E30 M3) are registered trademarks of BMW AG.
M3Forum Terms of Service
Copyright 1999-2017 M3Forum.com
Discussing MSS54 Final drive changed to 4.45->limp mode.Please HELP! in the Coding and Tuning Forum - Discuss all avenues of coding and tuning here! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)