03-24-2014, 07:15 PM | #67 | |
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That said, there would seem to be reasonable engineering design solutions to the material properties. E.g., large diameter bolt attachments embedded in material with higher ductility (e.g., spectra 5000 cured in appropriate resins).
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03-24-2014, 07:50 PM | #68 |
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Hey I just noticed that the Moto GP safety car has a light bar that looks to be mounted into the roof -- assume it's carbon.
http://f80.bimmerpost.com/forums/sho...7#post15659657
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03-26-2014, 12:02 PM | #69 |
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For what it is worth, it is not possible to have a roof rack from BMW or any 3rd party for my 2008 M6 with carbon fiber roof. It is a PIA, as I can't take my Colnago's when we go on vacation. But having seen the way you can deform the roof if you over tighten the BMW mounts (on my ex-545), I'm sure you would be looking at a new $3k carbon fiber roof.
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03-26-2014, 12:15 PM | #70 |
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But as far as I am aware the E92 M3 with the CF roof was able (and designed) to work with the OEM roof rails. So it would be nice to know what it is about the new one that has changed. Someone mentioned the CF cross brace as a possibility. It would be nice to get confirmation if that's the case.
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03-26-2014, 10:59 PM | #71 | |
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03-27-2014, 06:39 AM | #72 | |
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Like you, I would guess one could put the bolts in and get it to mount up just fine. The question is what, exactly is the risk involved in doing so? |
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03-27-2014, 09:45 AM | #73 |
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i'm not as familiar with anisotropic materials like carbon fiber, but i don't think that the CF (or even steel) roof panel would bear much load in normal situations. maybe some tensile and compression forces as it helps keep the roof frame "square"? any vertical loading from bikes/racks, etc would be applied to the steel structure around the CF roof panel (and the steel A, B and C pillars).
if it does fail, however, stressdoc is right: CF usually fails pretty catastrophically, as opposed to the ductile failure of steel and other metal alloys. it's a concern for me as well--i was cross shopping the F80 w/ the new STi, and was upset to find out that the new STi may not have roof attach points either.
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03-28-2014, 08:49 AM | #74 |
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I don't think it's the vertical loading (weight) that is the problem. When you crank a rack down it can exert a lot of compression across the roof -- I notice that sometimes the sunroof will not close on my E90 when I have a rack on tight. That could begin to fatigue the carbon fibre structure or perhaps even cause micro fractures on the surface resin. This could be fixed by having a rack with a cross bar attachment that could float (move) relative to the base support.
Better yet, replace carbon fibre with a proper ceramic!
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04-29-2014, 08:11 PM | #75 |
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This is *really* not good news.
I currently drive an E92 M3 and occasionally need to transport my single scull to races... (it's a 25 foot long carbon fiber racing shell weighing 10kg.) For the past 4 years I've used roof bars on my E92 and this has worked perfectly. I have an M4 ordered for June production and now I probably have no way to get to races. Well done BMW. |
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04-29-2014, 10:09 PM | #76 | |
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Greg Lake Oswego, Oregon, USA 2023 M2 Coupe - Brooklyn Grey/Cognac/CF, 6MT; 2020 MB GLE 450 |
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04-29-2014, 10:32 PM | #77 | |
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04-29-2014, 10:41 PM | #78 |
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The seasucker system looks good.
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05-04-2014, 05:03 AM | #79 |
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05-04-2014, 11:49 PM | #80 | |
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http://f80.bimmerpost.com/forums/sho...d.php?t=977158
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05-07-2014, 10:53 PM | #82 |
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05-07-2014, 11:34 PM | #83 |
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05-08-2014, 12:05 AM | #84 |
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05-08-2014, 02:36 AM | #85 | |
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05-08-2014, 02:50 AM | #86 | |
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Last edited by curehead; 05-08-2014 at 05:57 AM.. |
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05-08-2014, 03:22 AM | #87 |
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But the hole should be central like the one in Alessandro's picture. Interesting your one hadn't been drilled out but the other had been but filled with a blank. Hence my thought about a manufacturing spec change done inconsistently so they just goto lowest common denominator and remove the function altogether.
Either that or its an option. |
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05-08-2014, 07:05 AM | #88 |
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By "uae's car", he meant "uae247's car". This is the car that is the topic of the 1000+ post thread on this forum and it is most certainly a production car.
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