Login


01062009, 05:36 AM  #1 
Major
35
Rep 1,172
Posts 
Stock gear ratios & final drive gearing
I am so confused with different / controversial info I have read over time on this.
Does anyone know what are (i) the gear ratios, and (ii) the final drive (differential) gearing, for stock 6MTs and DCTs? On gear ratios I remember reading somewhere in this post that MT6: 4.06, 2.37, 1.58, 1.19, 1.00, 0.87 DCT: 4.78, 2.93, 2.15, 1.68, 1.39, 1.20, 1.00 Is this right? On the final drive I am a bit confused with various numbers. Does anyone know? I am only talking stock please. Thanks in advance! 
01062009, 06:22 AM  #3 
Major
35
Rep 1,172
Posts 

Appreciate
0

01062009, 02:31 PM  #4 
Captain
12
Rep 677
Posts 
MDCT
14.780 22.933 32.153 41.678 51.390 61.203 71.000 Final drive 3.154 http://www.m3post.com/goodiesforyou/mdctinfo.PDF 
Appreciate
0

01062009, 02:56 PM  #5 
Racying Dynamics
71
Rep 4,397
Posts 
Would the number of teeth make a difference?
__________________
==================================================

Appreciate
0

01072009, 08:59 AM  #6  
Major
35
Rep 1,172
Posts 
Quote:
Quote:
I just wanted these to calculate the speed of the 6MT & of the DCT at any given gear & engine rpm, which I did in an excel spreadsheet and seems to be working (I cross checked my findings for the 6MT with a couple of magazines that report top speed for each gear). According to my calculations, the (theoretical) top speed at 8,400rpm for the stock 6MT and DCT is 302km/h and 321km/h respectively (assuming that the engine is allowed to rev up to the redline in the top gear on each car and assuming that it has enough power!). 

Appreciate
0

01072009, 10:47 AM  #7  
Racying Dynamics
71
Rep 4,397
Posts 
Quote:
__________________
==================================================


Appreciate
0

01072009, 10:57 AM  #8 
Major
35
Rep 1,172
Posts 

Appreciate
0

01072009, 11:24 AM  #9 
Racying Dynamics
71
Rep 4,397
Posts 
Sure, rev limited as well. Thanks
__________________
==================================================

Appreciate
0

01082009, 08:04 AM  #11 
Major
35
Rep 1,172
Posts 

Appreciate
0

01082009, 10:53 AM  #12 
First Lieutenant
10
Rep 313
Posts 
Thanks, that helps. And the final drive? What is that exactly?
__________________

Appreciate
0

01082009, 10:53 AM  #13 
Racying Dynamics
71
Rep 4,397
Posts 
Simple and clear, thanks again.
__________________
==================================================

Appreciate
0

01082009, 11:19 AM  #15 
Racying Dynamics
71
Rep 4,397
Posts 
OK even clearer now.
__________________
==================================================

Appreciate
0

01082009, 11:26 AM  #16  
First Lieutenant
7
Rep 330
Posts
Drives: BMW (E92) M3 & 2004 JCW MCS
Join Date: Oct 2008
Location: Brunei Darussalam

Quote:
Thanks mate
__________________
Warm Regards,
Mischievous M No Replacement For Big Displacement! 

Appreciate
0

01082009, 11:42 AM  #17 
Major
35
Rep 1,172
Posts 

Appreciate
0

01082009, 11:47 AM  #18  
First Lieutenant
7
Rep 330
Posts
Drives: BMW (E92) M3 & 2004 JCW MCS
Join Date: Oct 2008
Location: Brunei Darussalam

Quote:
I never understood the entire ratios of gears until you've clear it up a lot better with a crisp to the point statment. Thanks... am reading a lil more about it on howstuffworks.com
__________________
Warm Regards,
Mischievous M No Replacement For Big Displacement! 

Appreciate
0

05192010, 01:42 PM  #19  
Major
37
Rep 1,142
Posts 
Quote:
thanks 

Appreciate
0

05192010, 02:16 PM  #20  
Moderator
1254
Rep 15,638
Posts 
Quote:
http://www.m3post.com/forums/showthread.php?t=292787
__________________
A genuine BMW effeightzero with them tandem clutches in the transmission and that dad gum sun roof on the topa da cawr.


Appreciate
0

05192010, 02:30 PM  #21 
Veni Vidi Vici
42
Rep 2,749
Posts
Drives: '11 JB/BBe6spe90
Join Date: Jul 2008
Location: Macungie PA
iTrader: (0)
Garage List 2011 e90 M3Sold [4.25]
2003 RS6  Sold [0.00] 2009 e90 M3  Gone [0.00] 2003 M3 SOLD [0.00] old 2002 [5.00] 
For those that need a picture ...

Appreciate
0

Post Reply 
Bookmarks 
Thread Tools  Search this Thread 

