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    • BMW replacing F80 M3 & F82 M4 carbon fiber driveshafts for conventional steel units for 2018 on model years

      Did you know the BMW F80 M3 and F82 M4 come from the factory with a carbon fiber driveshaft? Well, if not, now you do. The only problem is BMW will ditch the lightweight carbon fiber driveshaft for a conventional steel unit later this year for the upcoming 2018 cars.


      Why? There is not enough space for the larger diameter carbon shaft and the necessary petrol particulate filter which is necessary to meet emissions standards.

      Sounds like it will be a tight fit even with the thinner steel shaft. Stronger aftermarket S55 carbon driveshafts will likely pose an installation problem.


      Munich. From November 2017 onwards, the CFRP driveshaft in the BMW M3 Sedan, BMW M4 Coupe and BMW M4 Convertible high-performance sports cars (fuel consumption combined: 9.5 8.3 l/100 km [29.7 34.0 mpg imp], CO2 emissions combined: 218 194 g/km) will be gradually replaced by an M specific high-performance driveshaft made of steel. This measure will create the necessary technical basis for meeting future statutory emissions requirements. At a later point in time, a petrol particulate filter (PPF) will be incorporated into the existing installation space in these models in major markets.

      The newly developed steel driveshaft has been designed to ensure the superlative performance and handling qualities of the BMW M3/M4 high-performance sports cars remain unaffected.

      For production-related reasons, this pre-enabling needs to be carried out universally for the BMW M3 Sedan, BMW M4 Coupe and BMW M4 Convertible. This measure does not apply to the BMW M4 CS and BMW M4 GTS special-edition models.

      Now in their fifth generation, the BMW M3 Sedan, BMW M4 Coupe and BMW M4 Convertible represent the epitome of the high-performance sports car that can be used without compromise every day. Customer deliveries of the successful current generation of models have now topped 68,000.

      This article was originally published in forum thread: BMW replacing F80 M3 & F82 M4 carbon fiber driveshafts for conventional steel units for 2018 on model years started by Sticky View original post
      Comments 16 Comments
      1. AWSAWS's Avatar
        AWSAWS -
        Sounds like an excuse for swapping out an expensive piece of carbon fiber in place of a heavier and cheaper bit of steel...

        What about long term emissions of carrying more weight. Burning more fuel?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by AWSAWS Click here to enlarge
        Sounds like an excuse for swapping out an expensive piece of carbon fiber in place of a heavier and cheaper bit of steel...
        Interesting point.
      1. AWSAWS's Avatar
        AWSAWS -
      1. Eleventeen's Avatar
        Eleventeen -
        Sometimes I wonder if the CF driveshaft exacerbates (or even causes) the excessive wheelhop the M3 can experience.
      1. Eleventeen's Avatar
        Eleventeen -
        Actually, it looks like CF might be better at PREVENTING wheel hop:

        Click here to enlarge Originally Posted by Driveshaft Shop
        1. Steel or Chromoly tube will torsionally twist about 5-7 degrees

        2. Aluminum will torsionally twist about 20 degrees

        3. Carbon Fiber will Twist about 30 degrees

        What happens with the different material does not stop there, when the Steel/Chromoly comes back it does it like
        a spring with allot of force and power, The Aluminum also comes back quick. Not as quick as the steel but still has
        that spring effect. the carbon on the other hand comes back slower and over more time. This will allow the tube to
        take some of the harmful shock factor out of the drive train.
      1. 3DMetal's Avatar
        3DMetal -
        Sounds like they are planning for a petrol particular trap, for some reason I cant completely imagine is the mention of the CF shaft allowing for less room for this filter. Sign of the times to come Click here to enlarge.

        DI motors and their efficient micronized fuel spray, also lead to extra fine soot that regulations say need to be filtered out. The worry is they pass right into the blood stream from aspiration.

        How much more baggage can they stick on the tail pipe of these modern cars. a 911 may have to carry an emissions trailer .
      1. farbmw's Avatar
        farbmw -
        So does this mean the value of the 2015 to 2017 M's will have a better hold of it's value then the new 2018's because it came with the CF driveshaft?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by farbmw Click here to enlarge
        So does this mean the value of the 2015 to 2017 M's will have a better hold of it's value then the new 2018's because it came with the CF driveshaft?
        Doubt it. As long as they all have the same S55 without a proper crank hub revision values will be questionable.

        A newer M3 with the steel shaft and less miles will be worth more than an older M3 with the carbon shaft. Most people won't even know the difference.
      1. farbmw's Avatar
        farbmw -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Doubt it. As long as they all have the same S55 without a proper crank hub revision values will be questionable.

        A newer M3 with the steel shaft and less miles will be worth more than an older M3 with the carbon shaft. Most people won't even know the difference.
        Good point, but Click here to enlarge that they can't stick with the CF.
      1. subaru335i's Avatar
        subaru335i -
        yeah nothing BMW can do will make their depreciation any worse than it already is. Garbage cars.

        Gasoline particulate filter is a good idea though for health and safety (it is a well known problem with DI cars) but again just another reason to want an older port injection car with less expensive bull$#@! to break or clog.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by subaru335i Click here to enlarge
        Gasoline particulate filter is a good idea though for health and safety (it is a well known problem with DI cars)
        Expand on this. What happens?
      1. subaru335i's Avatar
        subaru335i -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Expand on this. What happens?
        Its the same as diesel engines, when you use high pressure direct injection of either kind the engine produces a lot more fine particulate soot from combustion.
        Diesel DI engines have had DPF's for a long time and makes sense that GDI engines need them too.

        Like another person said we still don't know what this soot production does for our health but it is thought it could be as bad or worse than NOx for lung irritation and problems.

        http://articles.sae.org/13624/
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by subaru335i Click here to enlarge
        Like another person said we still don't know what this soot production does for our health but it is thought it could be as bad or worse than NOx for lung irritation and problems.
        Oh man. Definitely not going catless.
      1. Eleventeen's Avatar
        Eleventeen -
        Click here to enlarge Originally Posted by subaru335i Click here to enlarge
        yeah nothing BMW can do will make their depreciation any worse than it already is. Garbage cars.

        Gasoline particulate filter is a good idea though for health and safety (it is a well known problem with DI cars) but again just another reason to want an older port injection car with less expensive bull$#@! to break or clog.
        I definitely have to disagree with BMW's being garbage cars. Great all-around cars for performance, comfort, and reasonable reliability.
      1. subaru335i's Avatar
        subaru335i -
        Click here to enlarge Originally Posted by Eleventeen Click here to enlarge
        I definitely have to disagree with BMW's being garbage cars. Great all-around cars for performance, comfort, and reasonable reliability.
        Everyone makes a good car nowadays. BMW is nothing special anymore like they used to be.
        Terrrrrrible reliability, worst interiors compared to their main competitors, not ultimate driving machines with average performance compared to their peers.
        BMW's aren't the best car in any category anymore except maybe the X5M in the big fat lame SUV segment.
      1. Eleventeen's Avatar
        Eleventeen -
        Click here to enlarge Originally Posted by subaru335i Click here to enlarge
        Everyone makes a good car nowadays. BMW is nothing special anymore like they used to be.
        Terrrrrrible reliability, worst interiors compared to their main competitors, not ultimate driving machines with average performance compared to their peers.
        BMW's aren't the best car in any category anymore except maybe the X5M in the big fat lame SUV segment.
        You might not like them, but they definitely are not garbage. They actually have a very high reliability ranking:

        https://cars.usnews.com/cars-trucks/...ble-car-brands

        It's pretty funny how people's perceptions can differ so much, though. Probably based on their individual experiences. I see you also have a CTS-V; I recently sold mine. I liked the car, but in my experience, the level of quality did not meet that of BMW. Hopefully you've had better luck with yours.