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Originally Posted by Cuz5150
^^^this^^^
Is this the reason why its made out of steel?
I myself find it odd, that in 2014 BMW is not making rear sub-frames out of Aluminium  As far as i know, no other manufacture is rocking this set up. Its either expensive chunk of Aluminium or hard to mold, weld together |
The interview says it's a space consideration:
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... the rear one is made of steel; there wouldn't have been enough space available for an aluminium construction.
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Aluminum, being a weaker raw material than steel, requires more material to deliver the same strength.