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      02-15-2019, 04:39 PM   #369
Max Well
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Drives: '22 BG X3MC, '20 BSM X3MC
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Quote:
Originally Posted by PureModelsOnly View Post
But does it really matter in a car that already weighs 4600 lbs. BMW doesn't want to spend the money to crash test a solid roof X3M.
Suspect your comment is only meant to foster discussion, and that's fine.

But if you really haven't read much on the subject I would respectfully suggest reading some of it. This isn't about CF bling for parts (which look great but have little to do with aerodynamics or weight savings for the small parts offered). It is the SUV group (and other taller vehicles) these initiatives are specifically targeting considering they are inherently more unstable than lower platforms. The stability controls which BMW and others have instituted have gone a long way to improve the risks, but they aren't fool-proof against the Physics involved.

And to be clear, my point is not about resurrecting hope for the CFRP (that is a lost cause), but rather simply allowing US customers the chance to opt out of the heavy moon roof (if Ibiza's comment is accurate). There really is no tenable argument here against the benefits of removing 112 lbs off the roof of a car when it comes to dynamics and handling.

Here are some links as background:

https://www-esv.nhtsa.dot.gov/procee...ESV-000153.PDF
http://www.accidentreconstruction.co...ers%5b1%5d.pdf
https://crashstats.nhtsa.dot.gov/Api...ication/809868
https://www.nap.edu/read/10308/chapter/4
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