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01062009, 05:36 AM  #1 
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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 
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01062009, 02:31 PM  #4 
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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 
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01062009, 02:56 PM  #5 
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Would the number of teeth make a difference?
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01072009, 08:59 AM  #6  
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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!). 

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01072009, 10:47 AM  #7  
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01072009, 10:57 AM  #8 
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01072009, 11:24 AM  #9 
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Sure, rev limited as well. Thanks
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01082009, 08:04 AM  #11 
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01082009, 10:53 AM  #12 
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Thanks, that helps. And the final drive? What is that exactly?
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01082009, 10:53 AM  #13 
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Simple and clear, thanks again.
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01082009, 11:19 AM  #15 
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OK even clearer now.
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01082009, 11:26 AM  #16  
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Thanks mate
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01082009, 11:42 AM  #17 
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01082009, 11:47 AM  #18  
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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
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05192010, 01:42 PM  #19  
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thanks 

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05192010, 02:16 PM  #20  
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http://www.m3post.com/forums/showthread.php?t=292787
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05192010, 02:30 PM  #21 
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