Is there any structural difference between Carbon roof and moonroof in M3 Coupe?

Seank00 · 07-10-2012, 03:42 AM

I have E92 M3 coupe with moonroof instead of carbon fiber one.
I've always wondered if there is any difference between the two in terms of structure besides weight difference.

Please anyone let me know!

Thanks in advance for your input

Xtopherus · 07-10-2012, 03:57 AM

Quote:

Originally Posted by Seank00

I have E92 M3 coupe with moonroof instead of carbon fiber one.
I've always wondered if there is any difference between the two in terms of structure besides weight difference.

Please anyone let me know!

Thanks in advance for your input

I would guess probably not, which is why the moonroof version is steel. Both versions would have to meet safety standards in terms of crush strength.

dadealus · 07-10-2012, 07:19 AM

The CF roof is lighter thus lowering your center of gravity. I passed up many E92s in my search for my perfect E92... never found it had to order. The ones with the features I wanted all had moonroofs in which I didn't want. although my reasons for not wanting the moonroof was for the added head room. CF roof adds almost 2 inches of head room and when your 6'9" it counts.

Ghetto2315 · 07-10-2012, 07:26 AM

Quote:

Originally Posted by dadealus

The CF roof is lighter thus lowering your center of gravity. I passed up many E92s in my search for my perfect E92... never found it had to order. The ones with the features I wanted all had moonroofs in which I didn't want. although my reasons for not wanting the moonroof was for the added head room. CF roof adds almost 2 inches of head room and when your 6'9" it counts.

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luis_m3 · 07-10-2012, 07:37 AM

Quote:

Originally Posted by Ghetto2315

I'm looking for a big man for my semi-pro summer basketball league. You available?

swamp2 · 07-11-2012, 04:02 AM

No. The CF panel itself is not a stressed or structural member. It is bonded in place with a relatively light duty non structural adhesive.

Stealth ///M · 07-11-2012, 06:40 AM

Quote:

Originally Posted by dadealus

The CF roof is lighter thus lowering your center of gravity. I passed up many E92s in my search for my perfect E92... never found it had to order. The ones with the features I wanted all had moonroofs in which I didn't want. although my reasons for not wanting the moonroof was for the added head room. CF roof adds almost 2 inches of head room and when your 6'9" it counts.

At 6'9", the CF roof makes no difference regarding lower center of gravity, or weight, with that HUGE melon you've got bobbing around in there. lol

ChrisK · 07-12-2012, 05:40 AM

I can't remember the exact numbers, but I believe the CF roof saves 45lbs over the moonroof.

DBH · 07-12-2012, 10:56 AM

Quote:

Originally Posted by ChrisK

I can't remember the exact numbers, but I believe the CF roof saves 45lbs over the moonroof.

Actually ~48.5 lbs (22kgs).

Also, when you put a huge hole in a solid structure it will lose some of its rigidity.

tibra1 · 07-12-2012, 10:58 AM

CF is more structurally rigid than steel.

swamp2 · 07-13-2012, 01:41 AM

Quote:

Originally Posted by tibra1

CF is more structurally rigid than steel.

Which makes not one shred of difference unless the part is load bearing (i.e. stressed/structural). Again in this case the CF "cover" is not.

OMMMG · 07-13-2012, 02:31 AM

I would assume having a sunroof is better when you're taller, you can just stick your head out the roof

07-10-2012, 03:42 AM	#1
Seank00 Transparency 1 Rep 4 Posts Drives: E92 m3 2010 Join Date: Mar 2010 Location: So Cal iTrader: (0) Garage List 2010 E92 M3 [0.00]	Is there any structural difference between Carbon roof and moonroof in M3 Coupe? I have E92 M3 coupe with moonroof instead of carbon fiber one. I've always wondered if there is any difference between the two in terms of structure besides weight difference. Please anyone let me know! Thanks in advance for your input
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07-10-2012, 07:19 AM	#3
dadealus Second Lieutenant 21 Rep 228 Posts Drives: 13'E92 M3 Join Date: Jan 2012 Location: Atlanta Ga iTrader: (0)	The CF roof is lighter thus lowering your center of gravity. I passed up many E92s in my search for my perfect E92... never found it had to order. The ones with the features I wanted all had moonroofs in which I didn't want. although my reasons for not wanting the moonroof was for the added head room. CF roof adds almost 2 inches of head room and when your 6'9" it counts.
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07-11-2012, 04:02 AM	#6
swamp2 Lieutenant General 634 Rep 10,407 Posts Drives: E92 M3 Join Date: Sep 2006 Location: San Diego, CA USA iTrader: (3)	No. The CF panel itself is not a stressed or structural member. It is bonded in place with a relatively light duty non structural adhesive. __________________ E92 M3 \| Space Gray on Fox Red \| M-DCT \| CF Roof \| RAC RG63 Wheels \| Brembo 380mm BBK \| \| Vorsteiner Ti Exhaust \| Matte Black Grilles/Side Gills/Rear Emblem/Mirrors \| \| Alekshop Back up Camera \| GP Thunders \| BMW Aluminum Pedals \| Elite Angels \| \| XPEL Full Front Wrap \| Hardwired V1 \| Interior Xenon Light Kit \|
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07-12-2012, 05:40 AM	#8
ChrisK Major General 4470 Rep 7,589 Posts Drives: '19 M2C Join Date: Jun 2007 Location: Chicagoland iTrader: (7) Garage List 2019 BMW M2C [7.00] 2015 Porsche Macan S [0.00]	I can't remember the exact numbers, but I believe the CF roof saves 45lbs over the moonroof. __________________ www.ReTuneTheDeTune.com 2019 M2 Competition (Sunset Orange)
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07-12-2012, 10:58 AM	#10
tibra1 Banned 132 Rep 6,773 Posts Drives: 2011 ZCP M3 - 2007 335i crashd Join Date: Apr 2009 Location: NYC iTrader: (4)	CF is more structurally rigid than steel.
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07-13-2012, 02:31 AM	#12
OMMMG First Lieutenant 49 Rep 396 Posts Drives: 15' F80 M3 AW/BLK Join Date: Jan 2007 Location: Ashburn, VA iTrader: (0)	I would assume having a sunroof is better when you're taller, you can just stick your head out the roof __________________ 15' AW/BLK F80 M3, 6spd BM3, VRSF DPs, BMS Intakes, KW HAS
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