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      08-23-2020, 05:31 PM   #1
kyrix1st
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Carbon fiber driveshaft?

Will this return to the base or Competition model for this generation?

I recall F8x generation base weighed around 1490kg with the lightest factory spec(MT, manual seats), coupled with CFRP body parts that actually have lightweight advantages.

As much as I appreciate their clarification I would also appreciate that mods stop editing my post content.
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      08-23-2020, 06:08 PM   #2
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It's been gone for awhile. The carbon driveshaft was replaced with a steel driveshaft back in 2017. I don't anticipate it being offered for the G generation M3/M4. I think it may be linked to the fact that BMW had a recall on the carbon driveshaft eight months prior.

See link: https://static.nhtsa.gov/odi/rcl/201...8V713-2564.pdf
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      08-23-2020, 06:17 PM   #3
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It was dropped because of the need to fit the GPF and the chassis couldn't fit one any other way. So if they wanted to this time around I'm sure they could but as there has been no mention at all so far I'm guessing there won't be.
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      08-23-2020, 08:38 PM   #4
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Is there any data comparing the carbon fiber driveshaft F8x and the steel driveshaft f8x models to see if it actually made a difference? Or if it was more of a "because racecar" feature?
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      08-23-2020, 08:46 PM   #5
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Quote:
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Is there any data comparing the carbon fiber driveshaft F8x and the steel driveshaft f8x models to see if it actually made a difference? Or if it was more of a "because racecar" feature?

A carbon driveshaft actually has a couple different benefits other than being able to handle more torque when compared to a steel driveshaft. One major benefit to a carbon driveshaft is that it absorbs vibrations better than a steel or even an aluminum driveshaft. For a car like the M3/M4, it was 100% a 'because race car' feature. BMW could have gotten away with a steel or even an aluminum driveshaft from the very beginning and nobody would have noticed any kind of difference. Weight savings from a carbon driveshaft and an aluminum driveshaft isn't massive.
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      08-23-2020, 09:34 PM   #6
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Quote:
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A carbon driveshaft actually has a couple different benefits other than being able to handle more torque when compared to a steel driveshaft. One major benefit to a carbon driveshaft is that it absorbs vibrations better than a steel or even an aluminum driveshaft. For a car like the M3/M4, it was 100% a 'because race car' feature. BMW could have gotten away with a steel or even an aluminum driveshaft from the very beginning and nobody would have noticed any kind of difference. Weight savings from a carbon driveshaft and an aluminum driveshaft isn't massive.
Yes that was my hypothesis as well, that the M3/M4 platform isn't really extreme enough to reap the benefits
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      08-23-2020, 09:45 PM   #7
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My car has it according to specifications. Have I ever noticed a difference from a steel shaft? Nope. Do I care if it never returns in a car? Nope. Cool video though they made to launch it.
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      08-23-2020, 10:01 PM   #8
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I dont see it making a come back.
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      08-24-2020, 12:44 AM   #9
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Weight wise, steel driveshaft actually outperform the carbon driveshaft. Because although heavier for the given strength, steel is smaller (exactly what made fitting GPF possible) and thus rotating mass is much less. Meaning, steel shaft is lighter and easier to handle at speed.

M3/M4 doesn't have enough power to bother with a carbon driveshaft, knowing, yes, 1000hp will be the new norm in the G8X aftermarket. Many things can fail along the way, before you will have to worry about the shaft.
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      08-24-2020, 01:28 AM   #10
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Quote:
Originally Posted by SeanWRT View Post
Weight wise, steel driveshaft actually outperform the carbon driveshaft. Because although heavier for the given strength, steel is smaller (exactly what made fitting GPF possible) and thus rotating mass is much less. Meaning, steel shaft is lighter and easier to handle at speed.

M3/M4 doesn't have enough power to bother with a carbon driveshaft, knowing, yes, 1000hp will be the new norm in the G8X aftermarket. Many things can fail along the way, before you will have to worry about the shaft.
Have you measured the diameter difference between the two? It was advertised to reduce either rotating mass or weight(I don't recall which) by 40% at launch but I don't see how they could have made into the production without having performance advantage.

I also think that one piece carbon fiber driveshaft provides better throttle response than the traditional two-piece steel shaft. Not that there was anything wrong with the steel shafts that M3s used for generations. I remember one of the reasons Honda S2000 is regarded as having a great input response is the one-piece driveshaft.
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