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      07-25-2018, 10:30 PM   #45
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Quote:
Originally Posted by aswy6 View Post
i have read this is just a rebranded driveshaft shop shaft. if thats the case, it is garbage, with little value. $1,400 for just a few pounds of weight savings. also, i know someone who has broken one.

my mfactory is still going strong, by the way. quite a few track days since installation.
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      07-26-2018, 12:58 AM   #46
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Quote:
Originally Posted by aswy6 View Post
IIRC this does not use the OEM style guibo.
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      07-26-2018, 07:50 AM   #47
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Quote:
Originally Posted by roastbeef View Post
Quote:
Originally Posted by aswy6 View Post
i have read this is just a rebranded driveshaft shop shaft. if thats the case, it is garbage, with little value. $1,400 for just a few pounds of weight savings. also, i know someone who has broken one.

my mfactory is still going strong, by the way. quite a few track days since installation.
Does MFactory shaft suppose to hold longer than OEM one? How does OEM hold up under track conditions etc. Or what is the estimated lifespan of OEM shaft in terms of miles?
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      07-26-2018, 08:00 AM   #48
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Nobody knows that.
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      08-08-2018, 10:07 AM   #49
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I bought one when mFactory made their first batch but didn't get around to installing it until now. One thing I didn't see mentioned in this thread is that BMW says to replace, not reuse, all bolts connected to driveshaft. I also installed a diff with a 4.10:1 final drive - the diff to axle bolts should also be replaced (at 12 x $10 each!).

Giubo: 55 NM (41 ft lb) plus 90 degrees - 16 mm socket (Bolt: 26117527475, Nut: 26127536563)
Differential drive axle: 120 NM (89 ft lb) - E-14 torx socket (33211227944)
Drive shaft to differential: 40 NM (30 ft lb) plus 45 degrees - E-12 torx socket (26117526322)

Differential front: 100 NM (74 ft lb) - 18 mm socket
Differential rear: 165 NM (122 ft lb) - 21 mm socket
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      08-08-2018, 10:17 AM   #50
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Quote:
Originally Posted by DavidZ View Post
I bought one when mFactory made their first batch but didn't get around to installing it until now. One thing I didn't see mentioned in this thread is that BMW says to replace, not reuse, all bolts connected to driveshaft. I also installed a diff with a 4.10:1 final drive - the diff to axle bolts should also be replaced (at 12 x $10 each!).

Giubo: 55 NM (41 ft lb) plus 90 degrees - 16 mm socket (Bolt: 26117527475, Nut: 26127536563)
Differential drive axle: 120 NM (89 ft lb) - E-14 torx socket (33211227944)
Drive shaft to differential: 40 NM (30 ft lb) plus 45 degrees - E-12 torx socket (26117526322)

Differential front: 100 NM (74 ft lb) - 18 mm socket
Differential rear: 165 NM (122 ft lb) - 21 mm socket
Good info. I'm not gunna lie, I re-used bolts and just snugged them down really good.
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      08-08-2018, 10:18 AM   #51
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Quote:
Originally Posted by DavidZ View Post
I bought one when mFactory made their first batch but didn't get around to installing it until now. One thing I didn't see mentioned in this thread is that BMW says to replace, not reuse, all bolts connected to driveshaft. I also installed a diff with a 4.10:1 final drive - the diff to axle bolts should also be replaced (at 12 x $10 each!).

Giubo: 55 NM (41 ft lb) plus 90 degrees - 16 mm socket (Bolt: 26117527475, Nut: 26127536563)
Differential drive axle: 120 NM (89 ft lb) - E-14 torx socket (33211227944)
Drive shaft to differential: 40 NM (30 ft lb) plus 45 degrees - E-12 torx socket (26117526322)

Differential front: 100 NM (74 ft lb) - 18 mm socket
Differential rear: 165 NM (122 ft lb) - 21 mm socket
Good info. I'm not gunna lie, I re-used bolts and just snugged them down really good.
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      08-08-2018, 10:21 AM   #52
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Does m-factory still offer the driveshaft for sale?
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      08-08-2018, 10:38 AM   #53
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Quote:
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Does m-factory still offer the driveshaft for sale?
This would probably be your best bet: http://www.teammfactory.com/contact
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      08-08-2018, 10:40 AM   #54
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After a few months on MFactory driveshaft, I measured 8% improvement in fuel consumption. So it saves you money too!
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      08-08-2018, 11:13 AM   #55
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Quote:
Originally Posted by Redd View Post
After a few months on MFactory driveshaft, I measured 8% improvement in fuel consumption. So it saves you money too!
Makes sense. Less rotating mass vs. the stock unit.
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      08-08-2018, 11:33 AM   #56
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I weighed them:

22.5 lbs stock
11.9 lbs carbon fiber
10.6 lbs difference (CF shaft is 53% the weight of stock)

PS stock weight does include the weight of the center/support bearing though.
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      08-08-2018, 04:11 PM   #57
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Not as bad as i thought stock weigjt to be. After that one dude had his snap at laguna seca, ive been avoiding this mod but its always been tempting
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      08-08-2018, 07:00 PM   #58
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Not as bad as i thought stock weigjt to be. After that one dude had his snap at laguna seca, ive been avoiding this mod but its always been tempting
Who had one blow up?
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      08-08-2018, 07:04 PM   #59
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Did it wear through and then snap? A little rubbing won’t hurt a stock shaft but will kill CF. Bad mounts can allow that much movement.
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      08-08-2018, 08:57 PM   #60
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Quote:
Originally Posted by dj_dub View Post
I did use heat wrap on my x-pipe around where the shaft meets the flange to reduce the risk of separation due to high heat. This is recommended by the manufacturer...some people do it, some people don't. I'd recommend doing it as it is a cheap and easy way to protect your investment.
Is this a concern even with the heat shield in place?
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      08-08-2018, 09:03 PM   #61
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Quote:
Originally Posted by DavidZ View Post
Is this a concern even with the heat shield in place?
I wrapped mine just as an added piece of mind. I figured that since I was under there, I might as well do it and be done with it. It only took about 30 min to wrap all four areas.

Quote:
Originally Posted by Redd View Post
After a few months on MFactory driveshaft, I measured 8% improvement in fuel consumption. So it saves you money too!
That's awesome! I never though to measure my improvement.
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      08-08-2018, 09:36 PM   #62
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Quote:
Originally Posted by warp10 View Post
Who had one blow up?
Trinity autosport . Joe i believe is his name
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      08-08-2018, 09:40 PM   #63
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Quote:
Originally Posted by MSY View Post
Quote:
Originally Posted by warp10 View Post
Who had one blow up?
Trinity autosport . Joe i believe is his name
Think that was a fall line CF shaft.
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      08-08-2018, 10:00 PM   #64
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Quote:
Originally Posted by warp10 View Post
Think that was a fall line CF shaft.
I had the fall line CF Shaft uninstalled within 3 months after installing it. It had this vibration that would get more intense the faster you went.
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      08-08-2018, 10:02 PM   #65
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Quote:
Originally Posted by ashtaron14 View Post
Quote:
Originally Posted by warp10 View Post
Think that was a fall line CF shaft.
I had the fall line CF Shaft uninstalled within 3 months after installing it. It had this vibration that would get more intense the faster you went.
Yeah I have 20+ days on the MF shaft and no vibration. Love it
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      08-08-2018, 10:04 PM   #66
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I spoke to Michael @ MFactory when they first launched the product as well as after they paused production. I still want to get one but I don't think they have resumed production.
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