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BMW i3 I01 (2014 - Current)
The BMW i3 and BMW i8 are the first two cars launch under BMW's new sub brand BMW i. The i3 is an all carbon fiber, all electric vehicle meant for urban mobility.

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Old 03-27-2017, 04:09 PM
MGRMLN's Avatar
MGRMLN MGRMLN is offline
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Location: Atlanta, GA
Join Date: Feb 2003
Posts: 362
Mein Auto: Z3 and Z4 M Coupes
Rear ended

Hi everyone,

My 2015 i3 Rex was rear ended hard enough that it appears that the rear subframe that cradles the electric motor and REX engine has damage. The cost of repair has skyrocketed and I'm very concerned that the car will never be the same even after this fix. Has anyone had this kind of accident damage successfully repaired? super worried.


2015 Black Nissan GT-R Black Edition
2000 Evergreen/Evergreen BMW Z3 M Coupe
2015 Solar/Cassis BMW i3 Rex
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Old 03-27-2017, 05:31 PM
jadnashuanh jadnashuanh is offline
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Mein Auto: 535ix-drive GT; i3 BEV
The CFRP frame was designed so that at some very specific places beyond the damage, it can be cut off, and new pieces be installed. It is designed to progressively break before those hard points. If the damage extends beyond one of those points, the car will need to be totaled. It all depends on the quality of the repair shop. If they are a BMW i-certified repair shop, it should be as good as new, but maybe a few pounds heavier to account for the thicker layers used to bond the two pieces together. Luckily, I've not run into the need for one of those repairs.

Up to the failure point, CFRP flexes (not much), but exceed that capacity, it fractures. IOW, unless you bend it to failure, it returns to its original shape unlike a metal frame that can bend and twist. If it isn't broken, it's probably fine, and those parts that are, can be unbolted, or cut off, and new attached that are as good as new.
Jim DeBruycker

Last edited by jadnashuanh; 03-27-2017 at 07:30 PM.
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Old 03-28-2017, 09:52 AM
God-Follower God-Follower is offline
Location: Pacific Northwest
Join Date: Oct 2014
Posts: 818
Mein Auto: 2015\2016 i3s, F10 535d
The rear subframe is all aluminum with a few steel control arms, so if they are replacing it then there should not be any issues. Cut the old one off the CFRP and bond the new on one in the same spot.

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