F8X M3/M4 CF Drive shaft mod

[EthanolTurbo]

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

[Sharocks]

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.

[Corradoloco]

I pulled out the mother of all digital scales 🤣 results here - https://youtu.be/mBAH2AII5qA?si=3h9M4hH1jDjOdkTS

6.08 kg
13.4 lbs

[slavik1988]

I shared it on page 6 of this thread. There is a very noticeable difference.

[Radekxpl]

I weighed the stock driveshaft on a certified shipping scale with the result of 17.8 lbs but that was without a guibo. Didn't go with the F8x drivshaft but instead with the YFCM. The weight came in at 11.8 lbs without guibo.

Thank you for the info🙏, By any chance can you share your feedback immediate observations when you switched from stock to Yfcm driveshaft? Is there noticeable difference ?


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[slavik1988]

If one of you gents performing this mod could confirm Corradoloco's weight results it would be appreciated.

I weighed the stock driveshaft on a certified shipping scale with the result of 17.8 lbs but that was without a guibo. Didn't go with the F8x drivshaft but instead with the YFCM. The weight came in at 11.8 lbs without guibo.

[D-O]

If one of you gents performing this mod could confirm Corradoloco's weight results it would be appreciated.

[EthanolTurbo]

We pay about double for everything here so sounds right.

Yep, sad but true. I do believe there may be a driveshaft place in OC/LA/IE that can do this job for $300-400 properly, I just have to find it.

[jet_dogg]

Update: at the driveshaft specialist now. He is doing the measurements and we will begin modifying it today. Should be done in a couple days. Progress!

This isn't a cheap job though. This place is charging about $775 labor and parts. I'm going to bite the bullet for the sake of data but will be trying another shop for future driveshafts. These guys know what they're doing so it's worth the initial hit I suppose. That puts total cost at around $1075 for me. I am using my old stock E46 M3 driveshaft as a donor but according to this thread the 330i driveshaft will work as well and is peanuts cost-wise.

Hoping to have this installed middle of next week.

We pay about double for everything here so sounds right.

[Radekxpl]

On the East coast upon investigating this modification how much would it cost to get this done, few driveshaft shops I inquired approximate cost have quoted me $250-$300 (fit, weld, balance) to get this done. Which is not bad at all 🤔 I guess it's all dependent where you live, but then again those are quotes from different shops not actual work performed, will confirm upon actual work completed on the prices.


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[EthanolTurbo]

I think it was Oceanside Driveline that I used to use back in the day. That was about twenty years ago though so YMMV!

Yep I went there, they're 10 mins from my house. They looked at it for 5 mins and said they couldn't do it.

[Bry5on]

California labor ain't cheap. I fully expect the labor to be 30-50% less than what I paid in other states/countries. I will also shop around but wanted to get this done with a competent shop and test it out.

I think it was Oceanside Driveline that I used to use back in the day. That was about twenty years ago though so YMMV!

[EthanolTurbo]

Why do you say that? I was planning on using their refresh kit when doing my R&P swap. Owner seems knowledgeable and helpful from whatever questions I asked him.

I just wouldn't put their junk parts into a diff when you can buy quality OEM parts and/or upgraded high quality aftermarket LSD units and get it done right the first time. Heard of a lot of failures with RacingDiffs junky parts.

[e46IX]

RacingDiffs is garbage, don't waste your time.

Why do you say that? I was planning on using their refresh kit when doing my R&P swap. Owner seems knowledgeable and helpful from whatever questions I asked him.

[EthanolTurbo]

That’s ~double what I paid to have my e60 M5 driveshaft shortened for the 6mt conversion 🤔

California labor ain't cheap. I fully expect the labor to be 30-50% less than what I paid in other states/countries. I will also shop around but wanted to get this done with a competent shop and test it out.