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View Poll Results: Would you like to have a CF roof on our E90/E93?
No, since I only like the E92 coupe. 22 39.29%
No, a CF roof on the E90/E93 is over doing it. 13 23.21%
Yes, I have a E90/E93 and would like a CF roof. 15 26.79%
Yes, if the E90/E93 had a CF roof I'd get it instead of a E92. 6 10.71%
Voters: 56. You may not vote on this poll

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      09-12-2008, 11:39 PM   #45
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Originally Posted by rldzhao View Post
anyone care to do an finite element analysis with ANSYS?
wanna say that to my face

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      09-13-2008, 01:43 PM   #46
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Quote:
Originally Posted by rldzhao View Post
again guys, without more information about the car, materials, etc., it's very hard to determine exactly how much performance advantage a CF roof has over a steel roof.

Performance gain? Definitely. But NOTICEABLE performance gain? Hardly. Marketing? More than you can imagine.
Marketing... So I guess the only reason for not having the CF roof on other M3 variants is the lack of customers. Here's another question, and I've put up a poll to answer it: would you like to have a CF roof for your E90/E93?
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      09-13-2008, 02:12 PM   #47
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Quote:
Originally Posted by synclastica_86 View Post
...and I've put up a poll to answer it
What a surprise.


Best regards, south
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      09-13-2008, 02:34 PM   #48
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What a surprise.


Best regards, south
Hey south i'm taking a German class so I can learn a little bit before my euro delivery of my next car

(off topic sorry)
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      09-13-2008, 03:45 PM   #49
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Hey south i'm taking a German class so I can learn a little bit before my euro delivery of my next car
Great. Verstehst du mich schon?


Best regards, south
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      09-13-2008, 04:01 PM   #50
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Great. Verstehst du mich schon?


Best regards, south
Ja tue ich

some words are hard though, like GRUN lol I can't ever say that right

Deutschland ist schön (I think I said that right )
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      09-13-2008, 04:08 PM   #51
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Ja tue ich

some words are hard though, like GRUN lol I can't ever say that right
Nicht schlecht!

Most German people never get the English "th" right, so don't worry.


Best regards, south
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      09-13-2008, 04:13 PM   #52
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Nicht schlecht!

Most German people never get the English "th" right, so don't worry.


Best regards, south
I figure if I vacation in Germany for 3 months i'll come back speaking and understanding a majority of german
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      09-15-2008, 01:22 PM   #53
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Quote:
Originally Posted by synclastica_86 View Post
Marketing... So I guess the only reason for not having the CF roof on other M3 variants is the lack of customers. Here's another question, and I've put up a poll to answer it: would you like to have a CF roof for your E90/E93?
Yep!
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      09-16-2008, 05:11 PM   #54
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None of you might want to do this... I'm just throwing this request out there. Can any of you photoshop wizs do a E90/E93 with a CF roof? I just wanna know how it looks.
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      09-16-2008, 05:22 PM   #55
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I think that BMW added the carbon roof to the coupe only for marketing reasons. Performance benefit in terms of rigidity an weight are not significant between the steel roof and carbon roof with the rigidity of steel matching the performance gain of lighter carbon. The sedan does not have it since its the family option and most guys choosing it want more luxury features such as a sunroof.
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      09-16-2008, 08:44 PM   #56
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Quote:
Originally Posted by Doc View Post
I think that BMW added the carbon roof to the coupe only for marketing reasons. Performance benefit in terms of rigidity an weight are not significant between the steel roof and carbon roof with the rigidity of steel matching the performance gain of lighter carbon. The sedan does not have it since its the family option and most guys choosing it want more luxury features such as a sunroof.

improving the handling is a marketing tool for the M3. small things all add up, move the calipers inboard, aluminum subframes, CF roof. it all adds up - any small part on its own is not significant. but together they make the heavier e92 handles better.
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      09-17-2008, 05:12 AM   #57
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a sheet of steel has the same structural rigidity from all angles. Carbon fiber however can be made to be more rigid when applying pressure from a certain angle based on the weaves of the carbon fiber. Its hard to crush a soda can vertically but its easy from the sides. Short of a crash in performance terms your never going to apply pressure on the roof from front to back, so they might've sacrificed some strength in that to make it more rigid from side to side ( its a bit more complicated than that the structure of a car tends to twist when going through a corner because when braking weight goes to the front so the fronts heavier and more planted, and of course the lsd is going to send more power to the outside wheel and probably a million other complicated things i dont understand.) That should be the basics of it, I'm no engineer, but no doubt the actual affect on the car is insignificant, but that's the point of these performance cars. Build every little part to the best of their abilities, 299 hp vs. 300, lets go for the 300. Save 2 lbs? sure. Shave the carpet in a gt3 rs to save a few ounces? why not. they all eventually add up as sayemthree said.
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      09-17-2008, 07:08 AM   #58
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Quote:
Originally Posted by snoopy View Post
a sheet of steel has the same structural rigidity from all angles. Carbon fiber however can be made to be more rigid when applying pressure from a certain angle based on the weaves of the carbon fiber. Its hard to crush a soda can vertically but its easy from the sides. Short of a crash in performance terms your never going to apply pressure on the roof from front to back, so they might've sacrificed some strength in that to make it more rigid from side to side ( its a bit more complicated than that the structure of a car tends to twist when going through a corner because when braking weight goes to the front so the fronts heavier and more planted, and of course the lsd is going to send more power to the outside wheel and probably a million other complicated things i dont understand.) That should be the basics of it, I'm no engineer, but no doubt the actual affect on the car is insignificant, but that's the point of these performance cars. Build every little part to the best of their abilities, 299 hp vs. 300, lets go for the 300. Save 2 lbs? sure. Shave the carpet in a gt3 rs to save a few ounces? why not. they all eventually add up as sayemthree said.
Yes... every little parts adds up... but why not add it to the E90/93?
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      09-19-2008, 03:13 PM   #59
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So still no photoshop pics?... BTW... are there any way to make the E90 roof look cf?
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      09-19-2008, 05:34 PM   #60
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CF roof

Quote:
Originally Posted by synclastica_86 View Post
BTW... are there any way to make the E90 roof look cf?
Probably, but PLEASE don't go there. However, you can bet Vorsteiner will have a CF replacement roof panel for the sedan, with and without sunroof, like they do for the E46 coupe.
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      09-21-2008, 07:09 AM   #61
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Probably, but PLEASE don't go there. However, you can bet Vorseiner will have a CF replacement roof panel for the sedan, with and without sunroof, like they do for the E46 coupe.
What do uoy mean by replacement? Do you mean that the original will be taken off so that there will be an actual weight saving?
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      09-21-2008, 07:42 AM   #62
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Quote:
Originally Posted by synclastica_86 View Post
What do uoy mean by replacement? Do you mean that the original will be taken off so that there will be an actual weight saving?
Naturally. I think it would be nearly impossible to do a CF roof correctly if you were to attempt to overlay it on top of the existing steel roof. The M3 coupe's carbon fibre roof is also designed in this same manner.

As with the coupe, the CF itself will provide only slight weight savings. The real weight savings comes from the fact that you do not have the moonroof and its necessary hardware.
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      09-21-2008, 10:15 AM   #63
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Quote:
Originally Posted by synclastica_86 View Post
Come on... the E90 isn't that bad...
"CAR" loves it - think they gave the E92 **** when it came out and E90 ***** (cheaper and does the job).
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      09-21-2008, 03:00 PM   #64
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Quote:
Originally Posted by mkoesel View Post
Naturally. I think it would be nearly impossible to do a CF roof correctly if you were to attempt to overlay it on top of the existing steel roof. The M3 coupe's carbon fibre roof is also designed in this same manner.
I don't think so... as suggested in BMW's website and previous posts... the there is no steel roof under the CF roof... the CF roof is glued to the car with steel supports in the middle...
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      09-21-2008, 06:01 PM   #65
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I actually really like the E90 and E93 a lot and I also like the carbon fiber roof but I think it should be Coupe-only. The convertible is sporty but doesn't convey hard-core like a Coupe with a carbon fiber roof would. It might work on the sedan. Maybe.
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      09-21-2008, 06:45 PM   #66
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Quote:
Originally Posted by synclastica_86 View Post
I don't think so... as suggested in BMW's website and previous posts... the there is no steel roof under the CF roof... the CF roof is glued to the car with steel supports in the middle...
Isn't that what I just said though? Your original question was:

"Do you mean that the original will be taken off so that there will be an actual weight saving?"

In short, yes, and that's what I was trying to explain in my post. Just like the coupe.
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