MFactory CF Drive Shaft

roastbeef · 01-31-2019, 01:56 PM

Quote:

Originally Posted by Malek@MRF

Quote:

Originally Posted by roastbeef

I installed my flex joint finger tight. I have solid sub/diff bushings and didn't have to move the diff. Right as I was about to give up, I moved the DCT up and it slipped in. I think I scraped about .5mm of material off muscling it in, but I got it. I was sure not to press on anything critical.

You can lower the rear sub-frame to get it to fit comfortably without much struggle, but this would be more difficult if doing it at home on jack stands.

Yea, I was all out of jacks, hydraulic jacks, and ideas. I was about to put it back together and drive to you. lol

slicer · 01-31-2019, 02:12 PM

Quote:

Originally Posted by thongvua

I believe MRF is in Irvine. If so I can drop it off at his shop this Saturday if you want since I'll also be heading that way. @Mfactory let me know.

That works. Malek will be at the shop between 10 AM and 1PM on Saturday - thanks!

thongvua · 01-31-2019, 02:18 PM

Quote:

Originally Posted by slicer

That works. Malek will be at the shop between 10 AM and 1PM on Saturday - thanks!

Sounds good. I'll plan accordingly.

AC/DC · 01-31-2019, 03:07 PM

Quote:

Originally Posted by roastbeef

i have the original Mfactory carbon shaft and it is great. holding up great as well. one of my favorite mods on the car.

Same! It's been great with no issues. Glad to see this is back in production!

thongvua · 02-02-2019, 04:12 PM

The test shaft is now at MRF.

M43S7RO · 02-02-2019, 10:42 PM

Any idea what the long term durability is of this?? My concern is I feel like I'd have to inspect the thing every so often to make sure its holding up.

roastbeef · 02-02-2019, 10:47 PM

Quote:

Originally Posted by M43S7RO

Any idea what the long term durability is of this?? My concern is I feel like I'd have to inspect the thing every so often to make sure its holding up.

My first gen is fine.

donut_boi · 02-02-2019, 11:49 PM

Quote:

Originally Posted by thongvua

The test shaft is now at MRF.

Congrats slicer , here's to another weight reduction mod

thongvua · 02-25-2019, 11:11 AM

Hi folks, since the CF shaft is wider than OE one do we need to bend the heat shield to avoid contact?

Redd · 02-25-2019, 06:03 PM

Quote:

Originally Posted by thongvua

Hi folks, since the CF shaft is wider than OE one do we need to bend the heat shield to avoid contact?

Yes you will need to carefully check that the heat shield does not touch the drive shaft. Can't bend it too much either as the exhaust is right below it.

slicer · 02-25-2019, 08:49 PM

My prototype DS is going in this week. I will report my results soon!

ebisu8 · 02-26-2019, 06:33 PM

Quote:

Originally Posted by roastbeef

My first gen is fine.

Mine is intact still as well. As for install on my 6MT, the trick for me was to let the transmission drop/til down and it wen in without any hassle. It was also easy for me because I was doing the CAE install too so I had all kinds of room under there!

SonnyJack · 02-26-2019, 06:55 PM

Quote:

Originally Posted by roastbeef

My first gen is fine.

Same here. No issues. Still not sure how you guys managed the install without dropping the diff. I tried for longer than I care to admit, but then finally gave up and just went and bought a table stand. Was a breeze after that.

roastbeef · 02-26-2019, 07:06 PM

Quote:

Originally Posted by SonnyJack

Same here. No issues. Still not sure how you guys managed the install without dropping the diff. I tried for longer than I care to admit, but then finally gave up and just went and bought a table stand. Was a breeze after that.

well, i was putting the car back together to give up. lol i was all out of jackstands/jacks, so i didn't have anything available to drop the diff by myself. once i jacked the dct back up to put the dct mount on, i thought i would try again. i may have jacked it up a smidge higher, but it somehow worked. i probably shaved about half a millimeter of material off while muscling it in. i was careful to only press on the metal rear part of the driveshaft so i didn't put any weird pressure or stress on the actual driveshaft or joints.

SonnyJack · 02-26-2019, 07:40 PM

Quote:

Originally Posted by roastbeef

well, i was putting the car back together to give up. lol i was all out of jackstands/jacks, so i didn't have anything available to drop the diff by myself. once i jacked the dct back up to put the dct mount on, i thought i would try again. i may have jacked it up a smidge higher, but it somehow worked. i probably shaved about half a millimeter of material off while muscling it in. i was careful to only press on the metal rear part of the driveshaft so i didn't put any weird pressure or stress on the actual driveshaft or joints.

This is why I gave up. I have broken sooooooooo many things that I just couldn't bare the thought of breaking that driveshaft.

thongvua · 02-26-2019, 08:59 PM

Updates:

I got the 6MT version driveshaft today and was able to put it in fairly painless, no dropping diff, jacking up trans etc., just had to massage the pumpkin a bit and was able to squeeze it in.

I have to run so can't complete everything else until later tonight, but I'm posting some pics so that some of the experts here can help QA and please let me know if you see something wrong. Please note, I haven't torqued any of the bolts yet. They are just finger tight.

amrazM · 02-26-2019, 11:56 PM

That looks awesome, mfactory take my money thank you.

SAMM3Y · 02-27-2019, 12:07 AM

Sub'd.. I'll be in for a 6mt

thongvua · 02-27-2019, 02:08 AM

Some fully torque'd diff end pics. Bolts tighten to 40nm + 45ish degree + blue thread locker. All of the 6 bolts are ribbed.

Not sure if the joint is stretched too much, @Mfactory?

The flex joint end of the shaft is a bit bulky and doesn't leave enough space to fit a socket to the bolt head so I'll have to pick up a 18mm wrench (for some reason I don't have or can't find...) tomorrow and just gonna do TAF torque.

Oh by the way, for some reason the weight I provided before is quite off:

OEM shaft - 10.3 kg
Mfactory shaft: 5.5 kg

MFactory · 02-27-2019, 02:33 AM

The joint is designed to flex/compress, so should be ok. How far along is it in it's movement?

Maybe try adjusting the rear diff mounts slightly to compress it in a little if you find it too extended (if that makes sense?)

thongvua · 02-27-2019, 02:52 AM

I didn't measure how far it was extended from its most compressed point. I was hoping you might have some tolerance data.
I'm probably just being paranoid so I'll leave it as is for now.

MFactory · 02-27-2019, 03:10 AM

The CV joint is designed to travel 30mm in/out

The MT fitment is 21mm shorter than the DCT fitment. When you tried to install the DCT previously, at full compression (15mm), you were still around 6mm shy of it fitting easily.

So best guess on this one, factoring in mount positions etc, you prob still have around 10mm either way of movement, which should be ok

02-02-2019, 04:12 PM	#181
thongvua Enlisted Member 29 Rep 44 Posts Drives: BMW M3 E92 Join Date: Oct 2018 Location: Los Angeles iTrader: (0)	The test shaft is now at MRF.
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02-02-2019, 10:42 PM	#182
M43S7RO Major 503 Rep 1,055 Posts Drives: Jerez Black E92 M3 Join Date: Sep 2015 Location: Peoria, AZ iTrader: (13)	Any idea what the long term durability is of this?? My concern is I feel like I'd have to inspect the thing every so often to make sure its holding up.
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02-25-2019, 11:11 AM	#185
thongvua Enlisted Member 29 Rep 44 Posts Drives: BMW M3 E92 Join Date: Oct 2018 Location: Los Angeles iTrader: (0)	Hi folks, since the CF shaft is wider than OE one do we need to bend the heat shield to avoid contact?
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02-25-2019, 08:49 PM	#187
slicer Major General 2739 Rep 6,734 Posts Drives: 'E46 M3 Race Car, '23 X7 Join Date: Jan 2009 Location: Wisconsin - Instagram - @slicer_m iTrader: (39)	My prototype DS is going in this week. I will report my results soon! __________________ '23 X7 '04 M3 - Fall Line Motorsports Built Race Car - S65 swap, Dry Sump, Bosch Stand-Alone ECU, Drenth Sequential Trans, MCS 3-Way, Flossmann Wide Body, Brembo Motorsports Brakes, Drexler LSD, BBS E88 Etc. INSTAGRAM - @Slicer_M
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02-26-2019, 08:59 PM	#192
thongvua Enlisted Member 29 Rep 44 Posts Drives: BMW M3 E92 Join Date: Oct 2018 Location: Los Angeles iTrader: (0)	Updates: I got the 6MT version driveshaft today and was able to put it in fairly painless, no dropping diff, jacking up trans etc., just had to massage the pumpkin a bit and was able to squeeze it in. I have to run so can't complete everything else until later tonight, but I'm posting some pics so that some of the experts here can help QA and please let me know if you see something wrong. Please note, I haven't torqued any of the bolts yet. They are just finger tight. Attached Images Last edited by thongvua; 02-26-2019 at 09:05 PM..
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02-26-2019, 11:56 PM	#193
amrazM mTekMods 2143 Rep 2,902 Posts Drives: like a granny. Join Date: Jan 2010 Location: Manhatan iTrader: (1)	That looks awesome, mfactory take my money thank you.
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02-27-2019, 12:07 AM	#194
SAMM3Y Colonel 3085 Rep 2,747 Posts Drives: 2008 m3 Join Date: Feb 2018 Location: NorCal iTrader: (2)	Sub'd.. I'll be in for a 6mt __________________ 9ers
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02-27-2019, 02:08 AM	#195
thongvua Enlisted Member 29 Rep 44 Posts Drives: BMW M3 E92 Join Date: Oct 2018 Location: Los Angeles iTrader: (0)	Some fully torque'd diff end pics. Bolts tighten to 40nm + 45ish degree + blue thread locker. All of the 6 bolts are ribbed. Not sure if the joint is stretched too much, @Mfactory? The flex joint end of the shaft is a bit bulky and doesn't leave enough space to fit a socket to the bolt head so I'll have to pick up a 18mm wrench (for some reason I don't have or can't find...) tomorrow and just gonna do TAF torque. Oh by the way, for some reason the weight I provided before is quite off: OEM shaft - 10.3 kg Mfactory shaft: 5.5 kg Attached Images
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02-27-2019, 02:33 AM	#196
MFactory Major 581 Rep 1,421 Posts Drives: E92 M3 Join Date: Feb 2014 Location: San Dimas, CA iTrader: (2)	The joint is designed to flex/compress, so should be ok. How far along is it in it's movement? Maybe try adjusting the rear diff mounts slightly to compress it in a little if you find it too extended (if that makes sense?)
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02-27-2019, 02:52 AM	#197
thongvua Enlisted Member 29 Rep 44 Posts Drives: BMW M3 E92 Join Date: Oct 2018 Location: Los Angeles iTrader: (0)	I didn't measure how far it was extended from its most compressed point. I was hoping you might have some tolerance data. I'm probably just being paranoid so I'll leave it as is for now.
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02-27-2019, 03:10 AM	#198
MFactory Major 581 Rep 1,421 Posts Drives: E92 M3 Join Date: Feb 2014 Location: San Dimas, CA iTrader: (2)	The CV joint is designed to travel 30mm in/out The MT fitment is 21mm shorter than the DCT fitment. When you tried to install the DCT previously, at full compression (15mm), you were still around 6mm shy of it fitting easily. So best guess on this one, factoring in mount positions etc, you prob still have around 10mm either way of movement, which should be ok
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