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      12-06-2013, 12:40 PM   #1
F82_SID
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Cool See Why the M3 M4 Carbon Fiber driveshaft is so cool (video on CFRP drive shafts)

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I found this video showing the strength of a CFRP drive shaft. I think it is pretty cool that the F8X M will have one of these!

I am a big car guy but a CFRP drive shaft was a new application of the material that I had never seen before so needless to say, I am kinda excited about stuff like that. Things like this are just part of what makes these cars special. I totally forgive BMW for not making the engines at a bespoke plant since they used the cost savings to reward us with things like this.

From the official BMW M3/M4 press release (from Official Thread):
Quote:
The properties of the extremely light yet impressively durable material CFRP have allowed the engineers to follow a fundamentally new approach in the manufacture of the drive shaft. Made from CFRP, this component feeds the engine’s torque from the gearbox to the rear differential and works under extremely heavy loads – especially in high-performance vehicles. “The impressive stiffness and low weight of the CFRP tubing allow the drive shaft to be constructed as a single-piece unit with no center bearing. As well as a weight saving of 40 percent over its predecessor, we have achieved a reduction in rotating masses and therefore improved drivetrain dynamics,” explains Albert Biermann.

The new BMW M3 Sedan and new BMW M4 Coupe also feature a CFRP propeller shaft. The high rigidity and low weight of the CFRP tube mean that the propeller shaft can be produced as a single-piece component, without a center bearing. This achieves weight savings of 40 percent over the previous model and a reduction in rotating masses, which in turn results in more dynamic powertrain response.



Some photos from Official Thread.

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      12-06-2013, 01:01 PM   #2
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That was cool! Never seen a stress test on steel vs CF on car parts.
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      12-06-2013, 01:11 PM   #3
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very cool stuff
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      12-06-2013, 02:02 PM   #4
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I'd love to see a static load test on all of the "lightweight" wheels people buy.
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      12-06-2013, 02:05 PM   #5
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wow thats crazy! very cool
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      12-06-2013, 02:16 PM   #6
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Very nice!Thank you
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      12-06-2013, 04:35 PM   #7
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      12-06-2013, 05:01 PM   #8
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Excellent video. You can have significantly lighter and significantly stronger in a single part. That is the "magic" of composites. The slightly disappointing story is that Nissan have put these on relatively pedestrian passenger vehicles for close to a decade. BMW is not leading the way here with a bleeding edge technology. I know you did not claim they were, but I think it is still relevant.
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      12-07-2013, 12:59 PM   #9
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That's amazing to see Thanks!!
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      12-07-2013, 06:13 PM   #10
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WOW
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      12-08-2013, 04:53 PM   #11
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cool, My RX8 had a CF drive shaft also.
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      12-08-2013, 05:45 PM   #12
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Thanks for sharing. That was a great video.
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      12-08-2013, 07:22 PM   #13
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More here.
http://www.acpt.com/Products/Composite-Driveshafts.aspx

http://www.scielo.br/scielo.php?scri...92012000600024
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      12-08-2013, 07:53 PM   #14
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Thanks, I had a preconception the carbonfiber drive shaft would shatter all over. It just broke. Curious how much the BMW M3/4 CFRP drive shaft can handle.
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      12-08-2013, 08:00 PM   #15
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F1 engineering is so
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      12-08-2013, 08:12 PM   #16
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I just read today in roundel that the CF driveshaft is so stiff it no longer requires a center bearing - is that accurate?

I'm really intrigued to drive this. Anytime you dramatically reduce the weight of an integral rotating part, the feeling of direct-response increases. The flywheel is probably the most classic example.

But the driveshaft has always been the longest rotating part of the assembly and the most prone to torsional forces as a result - so now I'm really curious how a super stiff super lightweight driveshaft feels in a high torque application.
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      12-08-2013, 09:29 PM   #17
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Quote:
Originally Posted by JoeFromPA View Post
But the driveshaft has always been the longest rotating part of the assembly and the most prone to torsional forces as a result - so now I'm really curious how a super stiff super lightweight driveshaft feels in a high torque application.
They are clearly focussing on parts that will free up the drivetrain and increase responsiveness
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      12-09-2013, 12:41 AM   #18
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Thanks I was wondering this too
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      12-09-2013, 12:47 AM   #19
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Terrific insight, thanks for sharing. Makes you wonder why BMW feature this technology in the E90's.

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      12-09-2013, 01:42 AM   #20
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Didnt 370z have cf driveshafts ten years ago?
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      12-09-2013, 02:57 AM   #21
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Quote:
Originally Posted by JoeFromPA View Post
I just read today in roundel that the CF driveshaft is so stiff it no longer requires a center bearing - is that accurate?
Yes. This has been stated in prior releases of information and you can clearly see the difference between the corresponding parts in the current E9X M3 and the new part in the pictures.

Quote:
Originally Posted by JoeFromPA View Post
I'm really intrigued to drive this. Anytime you dramatically reduce the weight of an integral rotating part, the feeling of direct-response increases. The flywheel is probably the most classic example.
Not exactly. It is basically the same as loosing weight with the added benefit that it is rotating weight. Performance is increased although the effect of this part alone won't be big enough to be felt. Now if you are talking about how quick an engine will rev in neutral that is a whole different thing which is affected much more by large changes to flywheel moment of inertia reductions

Quote:
Originally Posted by JoeFromPA View Post
But the driveshaft has always been the longest rotating part of the assembly and the most prone to torsional forces as a result - so now I'm really curious how a super stiff super lightweight driveshaft feels in a high torque application.
You, nor a seasoned race driver will not be able to tell the difference. The main reason is that the overall torsional stiffness of this part of the drivetrain is governed by the hard rubber "mating" parts that give the drivetrain a much decreased torsional rigidity giving the driveline an acceptable level of feel and "forgiveness". Those parts of the system will have their stiffnesses altered to accommodate the new design but very well might have their stiffnesses decreased substantially.

In short slightly more performance, non detectable.
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      12-09-2013, 03:07 AM   #22
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Quote:
Originally Posted by pkim1079 View Post
Didnt 370z have cf driveshafts ten years ago?
That would be super impressive, considering it came out 4 years ago.
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