F8X M3/M4 CF Drive shaft mod

[Altaran]

The guy in the shop told me that he balanced it at 3500rpm. That it's the max rpm he could do, not sure if it's enough or the problem is elsewhere. Its not very noticeable, but i guess i will have adress that.
What RPM the driveshaft has at top speed?

Depends on your final drive ratio. If you have a shorter diff like me it can exceed 8k rpm at 250+ kph

There's a calculator online:

https://www.drive-lines.com/php10/dlrpm.php

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[RazorM]

I installed the driveshaft late last year, did not really have time to drive it much.
Installation was easy, i have SMG car, no problems with clearance. I am running original heat shields, did only slight adjustment of the shield on one place so it doesn’t make contact. Installed with new guibo and CV joint.
BUT there may be slight vibration in mine. Starting at 130kmh and it stopped around 150-160kmh. The guy in the shop told me that he balanced it at 3500rpm. That it’s the max rpm he could do, not sure if it’s enough or the problem is elsewhere. Its not very noticeable, but i guess i will have adress that.
What RPM the driveshaft has at top speed?

Weight of the original driveshaft without guibo and bolts was 8,21kg compared to M4 with guibo and bolts 7,38kg. Not sure how much guibo with bolts can weight, I would guess around 400-500g. Somebody can measure it. So it would total around 15% weight loss, 1,2kg/2,64lbs.

I sourced used shaft for 200€ and had it adapted and balanced for 300€. Plus new guibo 60€ and CV joint 200€.

[0-60motorsports]

Update coming soon y'all. Got a little sidetracked upgrading the M2's HPFP for some E85 boostie action, I'll have the driveshaft in this week.

Sounds good. Looking forward to the review.

[EthanolTurbo]

Update coming soon y'all. Got a little sidetracked upgrading the M2's HPFP for some E85 boostie action, I'll have the driveshaft in this week.

[x Spades x]

Bump... any update?

Also, what are the confirmed shops (and location) that can do these without issue?

[Nate047]

Bump. FINALLY Installing my revised F8x CF driveshaft this week and will be able to test and provide the details. Stay tuned.

In for details.

[0-60motorsports]

Anyone figured out or know of a place in Atlanta, GA that can do this mod for an SMG car if I provide all the parts?

[x Spades x]

Bump. FINALLY Installing my revised F8x CF driveshaft this week and will be able to test and provide the details. Stay tuned.

Where did you get yours installed again?

[Obioban]

Please drive irresponsibly quickly, assuming it feels smooth.
(since driveshaft speed is proportional to road speed, not engine speed).

not sure how viable it it for you, but I’d really like to know its smooth to at least 150, and ideally 175 (indicated).

[EthanolTurbo]

Bump. FINALLY Installing my revised F8x CF driveshaft this week and will be able to test and provide the details. Stay tuned.

[0-60motorsports]

Found a guy from Ontario on IG that has a pic with this mod done from February. Profile is @velart_motorsport
I don't know him, but if anyone here is looking for a good shop in North America to get this done, he might be worth reaching out to.

Mine now has 3500km on it and is still working fine. It survived a ring trackday, so full load is not an issue 😂

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Shipping to and from Canada is ridiculously high especially to Bahrain.

[Mike RT4]

Found a guy from Ontario on IG that has a pic with this mod done from February. Profile is @velart_motorsport
I don't know him, but if anyone here is looking for a good shop in North America to get this done, he might be worth reaching out to.

Mine now has 3500km on it and is still working fine. It survived a ring trackday, so full load is not an issue 😂

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The drive-shaft is probably wondering where all the torque went .

[Altaran]

Found a guy from Ontario on IG that has a pic with this mod done from February. Profile is @velart_motorsport
I don't know him, but if anyone here is looking for a good shop in North America to get this done, he might be worth reaching out to.

Mine now has 3500km on it and is still working fine. It survived a ring trackday, so full load is not an issue 😂

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[x Spades x]

Bump!

[CrisSilberGrau]

Any more updates from the ones that have installed this mod? I have my 7629 being shipped soon. Need to see what is the best way to go about installing it.