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      10-19-2021, 09:54 AM   #23
2011ninja
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Quote:
Originally Posted by pfrederi View Post
Quote:
Originally Posted by F82KPowers View Post

Ok Thx. What are the Pros or Cons of having one over the other??

TBH I never knew such a High stress\load item could be made of carbon fiber but then again Im not that kind of engineer. Also i dnt know the limits of carbon fiber im just familiar with the small parts that can be covered using carbon fiber but such high stress bearing items especially for an automobile ive never known could be built using CF (except my bike is also CF but thats a bicycle not a car).

Thx
It's lighter and stronger for its application than steel.

I was skeptical too

I Searched YouTube and found a stress test of a formula 1 carbon fiber driveshaft vs steel.

They tested the twist force limits to a breaking point.

The steel shaft bent and twisted at a lower lbs of stress.

The carbon fiber took a lot more twist force before they found the limit. It's a very cool video.

Now think about how efficiently the carbon axel can spin up compared to steel.

Cool video!

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      10-19-2021, 10:36 AM   #24
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I was able to have my dealer confirm it on a routine visit that mine had it 2018 m3CS, I know there has been some debate if all CS cars have it so it was just a little curiosity that I needed to settle for myself. I’d love to drive 2 m3s back to back one w and one without in the real world to see if there is a noticeable difference
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      10-19-2021, 12:24 PM   #25
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Quote:
Originally Posted by N1rve View Post
The 15's are hoon machines with the old torque curve.

Wait so is this true? 2014-2015 F80's and F82's have a more aggresive torque curve from the factory ?

Could this be re-enabled through any of the various tunes out there? Pretty sure it is, but just double checking (for a friend )

Cheers,
Merlin
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      10-19-2021, 01:10 PM   #26
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Quote:
Originally Posted by Merlin_83 View Post
Quote:
Originally Posted by N1rve View Post
The 15's are hoon machines with the old torque curve.

Wait so is this true? 2014-2015 F80's and F82's have a more aggresive torque curve from the factory ?

Could this be re-enabled through any of the various tunes out there? Pretty sure it is, but just double checking (for a friend )

Cheers,
Merlin
Quote:
Originally Posted by Merlin_83 View Post
Quote:
Originally Posted by N1rve View Post
The 15's are hoon machines with the old torque curve.

Wait so is this true? 2014-2015 F80's and F82's have a more aggresive torque curve from the factory ?

Could this be re-enabled through any of the various tunes out there? Pretty sure it is, but just double checking (for a friend )

Cheers,
Merlin
From what I hear it's not something that you want.

It's easier to lose control and you have less usable power at lower speeds

Mine is a 2016 6MT F80. With moderate throttle under the right/wrong wet roads I've seen my traction control flicker at 60+ MPH
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      10-19-2021, 01:41 PM   #27
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Quote:
Originally Posted by Merlin_83 View Post
Wait so is this true? 2014-2015 F80's and F82's have a more aggresive torque curve from the factory ?

Could this be re-enabled through any of the various tunes out there? Pretty sure it is, but just double checking (for a friend )

Cheers,
Merlin
Yes. Every variant of this car has a different torque curve. It's part of what you're buying into if you get a: Standard, Comp, CS, GTS etc.

The early cars did have a more aggressive torque curve. It's as if BMW heard all the apocalyptic bitching about losing the V8 and said, "hold my beer...".

But even with that torque-injected-machismo, not only did the car journalists still cry about losing the V8, they bitched and moaned about the car having SOOO much torque that it was costing them tires and diapers. Still, others were losing control of their cars and blaming tire pressures -- but the journos knew it was because of the torque curve.

Subsequent years saw the torque curve softened a bit to make it more drivable.... which IMO, was a good thing. Honestly.

I got one of the first MY 2016s in the country. I thought the torque was pretty crazy at first too, but I got used to it. Then I got a BM3 tune and tapered off 1st and 2nd gear. It's so much more enjoyable to drive.
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      10-19-2021, 01:57 PM   #28
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Quote:
Originally Posted by Merlin_83 View Post
Wait so is this true? 2014-2015 F80's and F82's have a more aggresive torque curve from the factory ?

Could this be re-enabled through any of the various tunes out there? Pretty sure it is, but just double checking (for a friend )

Cheers,
Merlin
Yes, if I can recall there was some documentation that max torque comes on at a later time. I remember seeing the picture of a Dyno with a different Torque curve.

With a tune you can do whatever you want LOL.

Also the earlier cars came with a Magnesium Oil Pan, where they took that out later.
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      10-19-2021, 02:09 PM   #29
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Quote:
Originally Posted by NickyC View Post
In theory then, the cars with the CF driveshaft would be faster than the later models without the CF driveshaft unless HP was increased on later vehicles. I'm assuming there is no difference in reality, or so slight to even matter as I haven't heard this discussed or tested in a video.

I'm just glad to be back in a 15. I found the driving experience of my 18 Comp to be far less fun than the 15 M4 I traded it in on. Now with the 15 M3, hooligan mode seems to be reenabled and the car is just a ball of fun to drive especially with the KW V3s I installed.
This is so true re: the 2015's! Totally different experience than the later models. It's so unique I think of it as it's own model in the lineup. I'm in a 18 M4 Comp 6MT now and I still think back on my 15. I'm between getting a 15 M3 or an E90 M3 for a 4-door but at this point it's more a matter of which comes down in price faster.
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DSC, you say? Never heard of it

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      10-19-2021, 02:43 PM   #30
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I have a 2018 M4 ZCP 6MT, built 3/17 with March 2017 software and it had the lower rpm, higher torque mapping. While it was fun, it wasn’t very practical nor helped with wheel slip. After the ilevel software update, it transformed the car through out, delayed power curve, better steering and then in combination with the GTS, CS coding, was day and night.

That being said, the change in the power curve, I doubt, had anything to do with the change from the CF to the steel driveshaft.
I have the CF drive shaft.

Last edited by Fat Goose; 10-19-2021 at 02:51 PM..
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      10-21-2021, 03:03 PM   #31
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Quote:
Originally Posted by 2011ninja View Post
It's lighter and stronger for its application than steel.

I was skeptical too

I Searched YouTube and found a stress test of a formula 1 carbon fiber driveshaft vs steel.

They tested the twist force limits to a breaking point.

The steel shaft bent and twisted at a lower lbs of stress.

The carbon fiber took a lot more twist force before they found the limit. It's a very cool video.

Now think about how efficiently the carbon axel can spin up compared to steel.

Cool video!


Pretty Cool!!! and thx for the vid. I forgot to ask the dealer if i had the CF driveshaft or not but ill try nxt time. That CF is the truth!!!
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