F8X M3/M4 CF Drive shaft mod

[Bry5on]

Ok, thanks to EthanolTurbo the driveshaft is in my hands. Some info:

Measurements (~ +/-2mm):
Stock driveshaft: 1365mm
Modified F80-e46 carbon driveshaft: 1360mm

Weights, like-for-like naked with rear CV only (bathroom scale, using me as tare weight, repeated 6x each alternating back and forth between driveshafts, ~ +/- 0.1lb):
Stock driveshaft: 17.5lb
Modified F80-e46 carbon driveshaft: 14.1lb

Weight savings: 3.4lb, 19%

Extra measurements:

Diameter, carbon center shaft: 79.8mm
Diameter, carbon steel ends: 88.5mm

Diameter, e46 front: 75.1mm
Diameter, e46 rear: 60.3mm

Length, e46 front section, from flange as in photos: ~635mm
Length, e46 rear section, to solid end of shaft (not CV): ~730mm

Hope this clears some things up. Will try to measure runout and get to a test fit as soon as I get the chance. I'm betting that being 5mm short doesn't end up being an issue because I'm running solid subframe bushings and there's more than 5mm of play in the subframe bushings alone.

Edit: I don't think this has a moment of inertia benefit, so this *shouldn't* feel like a lightweight flywheel in first gear. So we'll see what the difference is with the stiffer shaft and fewer moving joints.

[EthanolTurbo]

I’m game to do a test if it installs without dropping the rear end! Alternatively we can take some detailed measurements of the stock shaft against the modified one to verify you got the dimensions sorted out with the last go around. I moved down to SD a few months back, it’s been a long time coming!

Awesome yeah, either works. You have to rock the diff backwards to install.

I'll PM you my phone #.

[0-60motorsports]

I think grape mint is what he smokes, he probably copied you. Message me on IG so I can start your driveshaft conversion.

Hahahahhahah YES! I can't find you bud. Can you please add me 060motorsports on ig

[Bry5on]

Hah, when did you move to SD? I thought you were in the Bay. I can go grab you a non-telescoping CF driveshaft and take your donor shaft to the drive shaft shop in Garden Grove for the conversion. Or you can test my already converted CF DS.

I’m game to do a test if it installs without dropping the rear end! Alternatively we can take some detailed measurements of the stock shaft against the modified one to verify you got the dimensions sorted out with the last go around. I moved down to SD a few months back, it’s been a long time coming!

[EthanolTurbo]

Hahahhaha yes brother that's true. He always messages me at the time I'm smoking my grape mint sheesha.

I think grape mint is what he smokes, he probably copied you. Message me on IG so I can start your driveshaft conversion.

[0-60motorsports]

This is so fucking true, but at least he is very consistent with his schwarma/hookah.

Hahahhaha yes brother that's true. He always messages me at the time I'm smoking my grape mint sheesha.

[EthanolTurbo]

That's great! Keep up the good work and i'll be ready too, hopefully.

Sharocks is useless, unless there is a schwarma or halal guys meal and hooka involved you'll never hear from him again

This is so fucking true, but at least he is very consistent with his schwarma/hookah.

[EthanolTurbo]

Damn...what happened to the engine?

At 252k miles it finally shit the bed, cylinder #6 has 50 psi of compression and was blowing clouds of smoke out the exhaust. Now I need a donor to swap my cams etc onto. 😮💨

[EthanolTurbo]

I’ve also got a spare e46 M3 driveshaft in San Diego right now if we’ve got motivation to knock out another..

Hah, when did you move to SD? I thought you were in the Bay. I can go grab you a non-telescoping CF driveshaft and take your donor shaft to the drive shaft shop in Garden Grove for the conversion. Or you can test my already converted CF DS.

[bigjae46]

Ok all, I'm back to working on this. Scored an LCI telescoping CF driveshaft for $200! I am planning to shorten it to work on my M2. I will also be giving my CF driveshaft to Sharocks to test on his Dinan S3R since my E46 M3 needs a new motor and uh I need to source a new one and find someone to install it properly.

Progress, right? Guys? 🫣

Damn...what happened to the engine?

[0-60motorsports]

Sharocks and I can help you source one.

That's great! Keep up the good work and i'll be ready too, hopefully.

Sharocks is useless, unless there is a schwarma or halal guys meal and hooka involved you'll never hear from him again

[Bry5on]

Ok all, I'm back to working on this. Scored an LCI telescoping CF driveshaft for $200! I am planning to shorten it to work on my M2. I will also be giving my CF driveshaft to Sharocks to test on his Dinan S3R since my E46 M3 needs a new motor and uh I need to source a new one and find someone to install it properly.

Progress, right? Guys? 🫣

I’ve also got a spare e46 M3 driveshaft in San Diego right now if we’ve got motivation to knock out another..

[EthanolTurbo]

Ok all, I'm back to working on this. Scored an LCI telescoping CF driveshaft for $200! I am planning to shorten it to work on my M2. I will also be giving my CF driveshaft to Sharocks to test on his Dinan S3R since my E46 M3 needs a new motor and uh I need to source a new one and find someone to install it properly.

Progress, right? Guys? 🫣

[EthanolTurbo]

I'd still like to do this if someone could get a good source and shop especially if it's in the Atlanta GA area for me lol

Sharocks and I can help you source one.

[0-60motorsports]

I'd still like to do this if someone could get a good source and shop especially if it's in the Atlanta GA area for me lol