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      12-05-2015, 02:45 AM   #1
Redd
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BMW Motorsports Final Drive

BMW Motorsports apparently offers a final drive upgrade for E92 M3 DCT. Anyone use this before? Any reviews?
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      12-06-2015, 03:29 PM   #2
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yes, i installed some bmw ms final drive gearsets in e92 pumpkins. what do you want to know?
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      12-06-2015, 04:35 PM   #3
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What is,ratio for dct, where do you get it? How's sound?
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      12-06-2015, 04:57 PM   #4
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i=3.62
i sell them and also have 3.45 and 3.73 gearsets in stock.
as well as 4.10 and 4.44 for 6mt.

sound?!
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      12-06-2015, 08:09 PM   #5
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How much and can you pm me order info
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      12-06-2015, 08:23 PM   #6
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Driftflo, how do these compare to the custom differentials that you've been making?
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      12-06-2015, 08:31 PM   #7
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Driftlo, thanks for the info. So the bmw ms are 3.62 final drive for dct?

Any risk of over rev? Will I need a tune to get the most out of it? What's the new top speed with the 3.62?
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      12-06-2015, 08:43 PM   #8
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Careful when going with an aggressive ratio on a DCT car, you can cause all sorts of shifting funkiness.
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      12-06-2015, 09:15 PM   #9
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Mike, thanks for the feedback. Looked back at some older posts and it does appear 3.62 is too short for DCT and will cause problems with shifting, rev matching etc. Sounds like 3.45 is the recommended FD upgrade.
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      12-06-2015, 11:43 PM   #10
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Quote:
Originally Posted by Mike Benvo View Post
Careful when going with an aggressive ratio on a DCT car, you can cause all sorts of shifting funkiness.
Agreed. Is a 3.45 too aggressive or would you be able to tweak the software to account for it?
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      12-07-2015, 12:37 AM   #11
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Driftflo, is the 4.1 for the MT a rebuilt with custom gears (assuming gears are not from BMW Motorsport)?
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      12-07-2015, 11:33 AM   #12
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Quote:
Originally Posted by Hujan View Post
Driftflo, how do these compare to the custom differentials that you've been making?
it doenst compare against each other as these are two different parts sharing the same housing. within the rear axle pumpkin sits the final drive gearset consisting of a pinion and a ringgear. besides that there is a differential inside the pumpkin (in the case of a e92 m3 it is a viscolok lsd unit) this is screwed to the ringgear of the final drive. so you can switch the stock lsd to a clutch type one that i suggest and leave the final drive gear ratio untouched. or you can switch the gears and leave the lsd as it was before. or you can switch both.

the lsd improves traction and stability, a shorter gearset will result in more torque to the wheels. 15% shorter will give you 15% more wheeltorque (so this is what you can expect from a 3.62 compared to a 3.15 ratio in a dct car).


this is a new 4.10 final drive gearset:


and this is a clutch type lsd core:


this is the pinion installed in the pumpkin:


and this is the ringgear attached to the new lsd:


and this is how it looks when it sits inside the pumpkin:




Quote:
Originally Posted by Redd View Post
Driftlo, thanks for the info. So the bmw ms are 3.62 final drive for dct?

Any risk of over rev? Will I need a tune to get the most out of it? What's the new top speed with the 3.62?
bmw ms never raced with the e92 dct. so there is no dedicated "official suggestion" for this car. but i can source bmw motorsports gearsets with i=3.62 (or also used gearsets that are still very good but much cheaper of course). the 3.45 is also a good option but only available as used part anymore. i also have a early new non-ms 3.25 here.

i suggest 3.45 for 1M racecars, 3.62 for e92 dct racecars and 4.10 for 6mt.

if you drive a 3.62 in automatic mode you should adjust the software. i have a guy here in germany who can do it but i guess it doesnt make sense to send the DME to germany and back?! maybe there is someone in the US who can do this too. i will ask him if he has a partner in the us.

you can calculate the topspeed with a gearbox calculator. depends on the wheels you are using and so on. one customer told me, he was still able to go beyond 300kph.



Quote:
Originally Posted by FogCityM3 View Post
Driftflo, is the 4.1 for the MT a rebuilt with custom gears (assuming gears are not from BMW Motorsport)?
i currently have the following parts in stock:

- 4.44 new
- 4.10 new
- 3.91 new & used
- 3.85 new & used
- 3.73 used
- 3.64 used
- 3.62 new & used
- 3.45 used
- 3.25 bmw oe new
- 3.23 used

all new gearsets are original bmw motorsports parts (except 3.25, this is an non-ms bmw part).
only the 4.10 and 4.44 feature a shotpeened surface, the others are more or less the same than the non-ms parts!
bmw gearsets are of very high quality and still quite affordable (compared to i.e. porsche gearset prices). aftermarket stuff is more expensive and often fails so i always try to usw oe parts here.
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      12-07-2015, 07:52 PM   #13
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Thanks driftlo! Highly informative!
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      12-07-2015, 10:43 PM   #14
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Still not clear if running 3.62 works with dct with redline at 8600
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      12-07-2015, 11:04 PM   #15
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Quote:
Originally Posted by 8600RPM View Post
Still not clear if running 3.62 works with dct with redline at 8600
The consensus is that it's not recommended to run 3.62 in DCT due to issues with rev matching and possibility of mechanical over rev.
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      12-09-2015, 01:15 AM   #16
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I purchased my car with the Dinan 3.45 already installed and it's great but I've never done a back-to-back comparison of my car vs stock. Also, when I called Dinan to ask some questions about it they indicated that they used to source the gears from BMW Motorsport before BMW stopped making them (as driftflo also mentioned).

I've also read posts where folks mentioned having issues with DCT and the 3.62.
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      12-09-2015, 02:40 AM   #17
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Quote:
Originally Posted by ///Mobbin View Post
I purchased my car with the Dinan 3.45 already installed and it's great but I've never done a back-to-back comparison of my car vs stock. Also, when I called Dinan to ask some questions about it they indicated that they used to source the gears from BMW Motorsport before BMW stopped making them (as driftflo also mentioned).

I've also read posts where folks mentioned having issues with DCT and the 3.62.
Interesting, would love to get a ride in a DCT 3.45 equipped E92 M3 to see the difference. 3.91 and 4.10 gears really woke the E46 M3 up, and I have always been curious about gears for the e92.
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      12-09-2015, 03:22 AM   #18
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Quote:
Originally Posted by ///Mobbin View Post
I've also read posts where folks mentioned having issues with DCT and the 3.62.
if you get the right software, there are no issues with the 3.62 gearset.
if you dont change the software there may be issues in automatic mode indeed.

what you also should keep in mind: the 3.45 gearset can be installed without changing the rear differential cover! for the 3.62 you will need the cover from a 6mt car!
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      12-09-2015, 04:18 AM   #19
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How intense is the install of 3.45's on a dct?
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      12-09-2015, 05:47 AM   #20
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no diy! switching the lsd unit is easier than switching the gearset.
you need some special tools, adjustment ring sets and the knowledge how to measure it in.

here i took some pics of a c63 amg gearset change i did recently:
http://www.limitedslip.de/service/einbau_c63.html

the m3 axle is a little different but the work and tools are more or less the same.
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      12-09-2015, 06:19 AM   #21
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driftlo, i'm keen on your used 3.45. While I have the diff open, is there any wear and tear parts I should change? Gaskets or bearings, etc?
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      12-09-2015, 07:12 AM   #22
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you need a new paper or liquid seal for the diffcover, a new flange seal for the pinion as well as a new crush sleeve for the pinion!
if there was no problem with the bearings and other seals before, there is no need to change them... although changing to new ones is never wrong of course!
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