10-14-2020, 06:54 AM | #68 | |||
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10-14-2020, 07:05 AM | #69 |
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The CS roof is a structural member, otherwise it couldn't contribute to body stiffness. Therefore it is part of the body/chassis. Not sure where the confusion is.
(maybe confusion is around the mixed terms. Body or chassis is usually referring to structural load bearing, torsional rigidity, or stressed member portions of the car. The "frame" in the old days or on portions of trucks, monocoque, tube chassis, or unibody depending on construction. "Bodywork" refers to covering panels - fenders, hoods, trunk lids, doors, etc.)
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10-14-2020, 07:12 AM | #70 |
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I'll summarize why this thread has gone to this. It hit the front page. People click the link. Only scroll through the photos. Gasp in horror and then type the first opinion they arrive at.
Artemis' post was quite clear on the differences of the M2cs roof. As was BMW in their press release. I think a lot of people here are associating the F80 chipping photos with the title of the thread. I thought I read that people that are actually taking deliveries now don't have any issues? Would be great to start a poll or something for actual owners. |
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10-14-2020, 09:06 AM | #71 | |
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10-14-2020, 09:07 AM | #72 | |
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10-14-2020, 10:22 AM | #73 | |||||
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10-14-2020, 11:24 AM | #74 |
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I would have a serious OCD episode if the CF roof on my M3CS started cracking and peeling. Lol. I would disagree with those that say the weight savings does not count. I don't know what the difference is but that's a large piece of sheet metal and it has to be fairly significant. It's also at the very top of the car.
Case in point. I strap a hard travel case to the back rack of my KTM 1090R. It weighs about 6 lbs when full of "stuff" and it's basically mounted at the highest point of the bike. My friend has the exact same bike but his soft case's (2) are mounted on the sides and about 10 inches lower. Just standing the bike up off it's kickstand mine feels 20lbs heavier. Keeping sprung weight low is important when tossing a car (or bike) around. |
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10-14-2020, 11:44 AM | #75 |
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I would definitely lose my shit over something like this if I was getting an M2CS.
It's such a special car, and made in limited numbers...how in the hell does that sort of defect make it through the quality control process before the car leaves the factory?
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10-14-2020, 11:52 AM | #76 |
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Here's mine... are they checking the roof right now?
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10-14-2020, 12:08 PM | #77 |
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The only tiny imperfections on the whole roof are on the left side in the middle almost . But you cannot see them even if you are close to the car in real life . You may see the "imperfection" but when you move a little hit and changes colour , seems normal . Honestly , i dont care about those imperfections , are so so tiny , in a roof that seems so beautiful , racing flag boxes , making great contrast with the colour of the car.
Each roof is different then , so each roof is unique . But , those imperfections , really are so few and small , but also cool since it seems like its handmade and they made each roof different ! It doesnt affect the car image at all !
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10-14-2020, 12:29 PM | #78 |
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See 03:20 to 03:30 and 08:00 to 09:00:
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10-14-2020, 01:33 PM | #79 |
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I may have missed an important post, as - I confess - I just skimmed the Thread: The M2 - in common with most modern cars - has a monocoque chassis in which all parts of the body structure (and some bolt on braces) form part of the chassis. So, if this replaces just the roof skin, it's likely to be cosmetic. If it replaces the braces between the roof pillars as well it may still be cosmetic, but is also structural.
In the meantime, here's a couple of links to help the argument along. https://www.realoem.com/bmw/enUS/sho...diagId=41_2163 https://www.realoem.com/bmw/enUS/sho...diagId=03_0183 |
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10-14-2020, 01:52 PM | #81 |
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Remind me: why does it matter if it's part of the body or the chassis? It's lighter and it's on top. Good place to reduce weight.
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10-14-2020, 01:55 PM | #82 |
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I had replied and then deleted a comment because I found that there are quite a few sources that define monocoque the way you interpreted it, which is not how I learned it in school - the outer skin has to be the stressed member is the simplistic explanation. I'd still call the M2 a unibody car, but seems like there is room for argument.
The diagrams and info would indicate that the difference is that all M2s have "something" assembled between the window/door frame arches to connect those portions of the body for rigidity. In a regular M2 it is riveted and glued steel beams, on the CS it is the carbon roof panel.
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10-14-2020, 01:57 PM | #83 |
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Because of the cosmetic issues and discussion around replacing the part. On M3's (including the CS and the heritage) and M2's previously it has just been a skin panel that is not structural. Not much worse than replacing a fender etc. On the CS it is installed from the inside from the info released, and is a structural component. It's not something the dealer or any old body shop is going to be doing basically.
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10-14-2020, 02:03 PM | #84 | |
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10-14-2020, 02:22 PM | #85 |
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Would now be a good time to bring up the way BMW briefed the motoring press on how the suspension of the C differs from the LCI (and OG)? It doesn't, but the supporting structure does and appears to have a significant effect. Which the press may have noticed, or possibly just reported.
So: It looks good, it may have an effect on the way the car feels to drive (mostly due to a change in stiffness, rather than weight reduction - fitting a sunroof will have a bigger effect), it might be possible to retrofit (as it appears in the retrofit section of RealOEM.com). |
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10-14-2020, 04:47 PM | #87 |
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Don't think so. That's the MPerformance carbon roof in there, which has been an available aftermarket part for a while. That's not a new thing. Nothing in there is calling out CS construction components. There's video reviews and everything from BMW Blog already showing the component and the completely different attachment points etc.
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10-14-2020, 04:48 PM | #88 |
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