Carbon Driveshafts: lets talk!

M3SQRD · 12-29-2024, 02:44 PM

Quote:

Originally Posted by Track/S

I have been doing it for a few years.

As always, amazing custom fabrication and welding skills! Your custom f8x CF DS would be the last piece I need to complete my e92 M3 build…

Track/S · 12-29-2024, 02:49 PM

Quote:

Originally Posted by M3SQRD

As always, amazing custom fabrication and welding skills! Your custom f8x CF DS would be the last piece I need to complete my e92 M3 build…

I am making the flex joint also lightened to the maximum, I will test it on my car first

The OE is quite heavy

M3SQRD · 12-29-2024, 03:21 PM

Quote:

Originally Posted by Track/S

I am making the flex joint also lightened to the maximum, I will test it on my car first

The OE is quite heavy

I’m curious to see what it ends up looking like. Do you do any finite element or hand analysis on your lightened designs? I’d be willing to do it for you but I’ve lost access to all of my custom advanced FE post-processing composite and metallic analysis tools (except hand analysis) due to my medical issues.

Track/S · 12-29-2024, 03:39 PM

Quote:

Originally Posted by M3SQRD

I’m curious to see what it ends up looking like. Do you do any finite element or hand analysis on your lightened designs? I’d be willing to do it for you but I’ve lost access to all of my custom advanced FE post-processing composite and metallic analysis tools (except hand analysis) due to my medical issues.

The best analysis is to mount it on the car and pray that it doesn't break LOL, I have a friend who has programs to test, sometimes I send him some stuff, I also want to make the rear hubs in grade5 titanium, also the LSD housing.

M3SQRD · 12-29-2024, 07:10 PM

Quote:

Originally Posted by Track/S

The best analysis is to mount it on the car and pray that it doesn't break LOL, I have a friend who has programs to test, sometimes I send him some stuff, I also want to make the rear hubs in grade5 titanium, also the LSD housing.

The pure testing approach is the way a lot of things were tested in the old days and even today (e.g., the SpaceX Starship).

We design a lot of critical parts, such as flexures in a kinematic or quasi-kinematic mounts, composite tube plug fittings, on-orbit servicing mechanisms, etc., with ti-6al-4v on space vehicles. The detailed design approach using FEA is a great approach and captures a lot of failure modes that could have resulted in costly failures; however, with space vehicle hardware it’s best to find failure modes with detailed analyses and/or test on the ground because an on-orbit failure can result in an end-of-mission failure. Two of the last programs I worked were GEO and LEO servicing missions using two 7-DOF robotic arms to capture, refuel and service space vehicles already on-orbit to extend their mission lives or, for example, fix a payload that had a deployable mechanism that got stuck by a thermal blanket during deployment, etc.

94jedi · 12-30-2024, 08:40 AM

I've had the YCFM V2 for a couple of years now (bought from euro connects gb). 2009, e92, 6-speed; No track time, and not a ton of miles (not my daily) but plenty of spirited back road driving and I plan to add track time to the resume in 2025. So far, no vibes, no adverse issues and no reason not to do it. There is a bit more NHV due to the directness of the solid 1 piece design but I think I prefer that now. I definitely felt better engine response and the engine seemed more eager to rev. I believe it's around a 19 or 20lb weight savings which in rotational mass terms is significant. I thought I'd lose the ability to "chirp" 3rd gear (silly I know) due to the reduced momentum/rotational mass but that hasn't occurred. I do have a little flywheel chatter if I don't drive the car perfectly but that was present prior to install and just just slightly increased (again the NVH thing) but I think that's a common thing w/ manuals in these cars.

Track/S · 01-09-2025, 12:04 AM

mikerunt ��

mikerunt · 01-09-2025, 07:08 AM

Quote:

Originally Posted by Track/S

mikerunt ��

My man! Cant wait. Thank you!

0-60Motorsports · 01-09-2025, 12:23 PM

Quote:

Originally Posted by Track/S

mikerunt ��

What’s going on here lol

mikerunt · 01-09-2025, 04:44 PM

Quote:

Originally Posted by 0-60Motorsports

What’s going on here lol

Carbon driveshaft on the race car

Track/S · 01-09-2025, 05:36 PM

Quote:

Originally Posted by 0-60Motorsports

What’s going on here lol

CF propshafts smuggling.

Not A M4 · 08-26-2025, 03:32 PM

Quote:

Originally Posted by Track/S

I sell them.

I don't suppose you could do this to make one that would fit an F32 xDrive driveshaft length/diff?

Track/S · 08-26-2025, 04:44 PM

Quote:

Originally Posted by Not A M4

I don't suppose you could do this to make one that would fit an F32 xDrive driveshaft length/diff?

What is the length of the OEM shaft?

Track/S · 09-07-2025, 12:39 PM

CF Driveshaft for 6MT ready to install

Not A M4 · 09-22-2025, 04:24 PM

Quote:

Originally Posted by Track/S

What is the length of the OEM shaft?

1302mm I believe. But the BMW part on real OEM says 1331. I have my drive shaft here and just measured it at ~51.25" or ~1301mm. I have a PST shaft that wasn't made correctly at all I am getting rid of, I would like to pick up a shaft from you if that is possible for 2018 440i xdrive. I have a 105mm guibo.

Track/S · 11-13-2025, 12:51 PM

CF propshaft for m3 e46

0-60Motorsports · 11-21-2025, 01:42 PM

Quote:

Originally Posted by Track/S

CF propshaft for m3 e46

Looks cool. Let us know how it goes.

chenium · 01-09-2026, 11:21 PM

Looks like MLT is prototyping a commercial version of F8x driveshaft conversion for e9x

Track/S · 02-22-2026, 05:31 PM

Quote:

Originally Posted by chenium

Looks like MLT is prototyping a commercial version of F8x driveshaft conversion for e9x

Everything's already been invented, and without music.

javie90 · 03-02-2026, 10:54 PM

I installed the Mfactory cf driveshaft and everything seems ok except for a noise during heavy deceleration. Kinda like its rubbing on something. Has anyone dealt with something similar?

IamFODI · 03-03-2026, 11:50 AM

Quote:

Originally Posted by javie90

I installed the Mfactory cf driveshaft and everything seems ok except for a noise during heavy deceleration. Kinda like its rubbing on something. Has anyone dealt with something similar?

If it were me, I'd inspect it ASAP. If it is rubbing on something, that's a ticking time bomb.

Redd · 03-03-2026, 06:42 PM

Quote:

Originally Posted by javie90

I installed the Mfactory cf driveshaft and everything seems ok except for a noise during heavy deceleration. Kinda like its rubbing on something. Has anyone dealt with something similar?

Check your heat shield clearances...

12-30-2024, 08:40 AM	#50
94jedi Major 876 Rep 1,284 Posts Drives: 2009 e92 M3 Join Date: Oct 2014 Location: United States iTrader: (0)	I've had the YCFM V2 for a couple of years now (bought from euro connects gb). 2009, e92, 6-speed; No track time, and not a ton of miles (not my daily) but plenty of spirited back road driving and I plan to add track time to the resume in 2025. So far, no vibes, no adverse issues and no reason not to do it. There is a bit more NHV due to the directness of the solid 1 piece design but I think I prefer that now. I definitely felt better engine response and the engine seemed more eager to rev. I believe it's around a 19 or 20lb weight savings which in rotational mass terms is significant. I thought I'd lose the ability to "chirp" 3rd gear (silly I know) due to the reduced momentum/rotational mass but that hasn't occurred. I do have a little flywheel chatter if I don't drive the car perfectly but that was present prior to install and just just slightly increased (again the NVH thing) but I think that's a common thing w/ manuals in these cars. __________________ 2009 E92 M3 build thread: https://www.m3post.com/forums/showthread.php?t=1754875 Follow me on IG - www.instagram.com/the_driven_enthusiast
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01-09-2025, 12:04 AM	#51
Track/S Colonel 3457 Rep 2,582 Posts Drives: M2C, M4 GTS Join Date: Oct 2019 Location: Around the world iTrader: (0)	mikerunt �� __________________ M2 Competition 6MT: MCS 3way, Full Kinematics, Custom LSD diff, Custom Flywheel, Lift Kit, CF Propshaft, 763M 18x11 ET30 Square, CF Recaro's PP, ST2 Hybrid Turbos, EU5 injectors, S58 HPFP's, Keyed Crank Hub, CCB, Ti Pistons, 1465kg 600hp/800nm.
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09-07-2025, 12:39 PM	#58
Track/S Colonel 3457 Rep 2,582 Posts Drives: M2C, M4 GTS Join Date: Oct 2019 Location: Around the world iTrader: (0)	CF Driveshaft for 6MT ready to install __________________ M2 Competition 6MT: MCS 3way, Full Kinematics, Custom LSD diff, Custom Flywheel, Lift Kit, CF Propshaft, 763M 18x11 ET30 Square, CF Recaro's PP, ST2 Hybrid Turbos, EU5 injectors, S58 HPFP's, Keyed Crank Hub, CCB, Ti Pistons, 1465kg 600hp/800nm.
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11-13-2025, 12:51 PM	#60
Track/S Colonel 3457 Rep 2,582 Posts Drives: M2C, M4 GTS Join Date: Oct 2019 Location: Around the world iTrader: (0)	CF propshaft for m3 e46 __________________ M2 Competition 6MT: MCS 3way, Full Kinematics, Custom LSD diff, Custom Flywheel, Lift Kit, CF Propshaft, 763M 18x11 ET30 Square, CF Recaro's PP, ST2 Hybrid Turbos, EU5 injectors, S58 HPFP's, Keyed Crank Hub, CCB, Ti Pistons, 1465kg 600hp/800nm.
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01-09-2026, 11:21 PM	#62
chenium Private 41 Rep 69 Posts Drives: Porsche 911, 2010 E90 M3 Join Date: Mar 2010 Location: NJ iTrader: (0)	Looks like MLT is prototyping a commercial version of F8x driveshaft conversion for e9x
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03-02-2026, 10:54 PM	#64
javie90 Private 16 Rep 98 Posts Drives: E90 335i Join Date: Mar 2007 Location: los angeles, ca iTrader: (4)	I installed the Mfactory cf driveshaft and everything seems ok except for a noise during heavy deceleration. Kinda like its rubbing on something. Has anyone dealt with something similar?
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