F8X M3/M4 CF Drive shaft mod

[SliM3]

F8x driveshafts have metal end where the oe flanges are welded from the factory anyway so this is pretty straightforward procedure of cutting off oe flange and welding e46 flange back on to appropriate length then balance the driveshaft, also the f8x oe driveshaft has balance weights attached to the metal end pieces of the shaft therefore no need to mess with any part of the carbon material of the oe driveshaft.


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You don't even need to hack-up your stock drive shaft. The weld-on splined stub and tri flange can be sourced separately, per Ethanols post above.

I'm going a different route than the traditional guibo/tri flange but purchased the weld-on splined stub and a weld-on 1350 yoke.


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[SliM3]

IIRC there was a recall on those.

Disregard, didnt to post this.
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[Radekxpl]

What are they welding to? Or do they bond an insert to the carbon and weld to that?

F8x driveshafts have metal end where the oe flanges are welded from the factory anyway so this is pretty straightforward procedure of cutting off oe flange and welding e46 flange back on to appropriate length then balance the driveshaft, also the f8x oe driveshaft has balance weights attached to the metal end pieces of the shaft therefore no need to mess with any part of the carbon material of the oe driveshaft.


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[bigjae46]

Interesting.

Back in 2015, S55's were snapping these things so BMW went back to metal driveshafts lol.

I took my DSS CF one out because it wasn't balanced correct, if anyone has this finally installed, I'd like to know who you used and if they would do it for all of us.

IIRC there was a recall on those.

I might do this for my E9X M3. I have an account with a rebuilder. Not sure if this is their thing but I'll have to ask. This place will turn around a metal DS overnight so they should be relatively quick.

[bigjae46]

Here's the invoice for parts and labor for everyone to check out and refer to.

What are they welding to? Or do they bond an insert to the carbon and weld to that?

[0-60motorsports]

Glad I got one of the ones for $170 😅, are we starting a Game Stop trend 🤣😂


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Lucky!!

[Radekxpl]

Just took a peek eBay. Used carbon f8X Driveshafts seem to have gone up in price already 🤣

Glad I got one of the ones for $170 😅, are we starting a Game Stop trend 🤣😂


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[Corradoloco]

Just took a peek eBay. Used carbon f8X Driveshafts seem to have gone up in price already 🤣

Savages

[Obioban]

Just took a peek eBay. Used carbon f8X Driveshafts seem to have gone up in price already 🤣

[EthanolTurbo]

Awesome!

Any chance you got weights with the M3 flanges on?

I will weigh it tomorrow when it's in hand.

[Obioban]

Update: carbon driveshaft has been successfully completed. Will be picking it up tomorrow and weighing it. I should have driving impressions in the next few days.

Awesome!

Any chance you got weights with the e46 flanges on?

[0-60motorsports]

Update: carbon driveshaft has been successfully completed. Will be picking it up tomorrow and weighing it. I should have driving impressions in the next few days.

That's awesome!

[EthanolTurbo]

Update: carbon driveshaft has been successfully completed. Will be picking it up tomorrow and weighing it. I should have driving impressions in the next few days.

[EthanolTurbo]

Pretty sure they went back to metal because cf didn’t fit with the increases emissions gears.

Either way— no danger of us snapping them 🤣

There's late model F8x CF driveshafts, for example all the CS models have a post-LCI CF driveshaft. The ones we are using are pre-LCI.

[Obioban]

Interesting.

Back in 2015, S55's were snapping these things so BMW went back to metal driveshafts lol.

I took my DSS CF one out because it wasn't balanced correct, if anyone has this finally installed, I'd like to know who you used and if they would do it for all of us.

Pretty sure they went back to metal because cf didn’t fit with the increases emissions gears.

Either way— no danger of us snapping them 🤣