「..The upper link on the F30 suspension is noticeably different from the E90. Both look like they were grown out of aluminum with their strange organic shapes but the F30 seems more refined. The F30 link is also 25% thicker and benefits from a solid inboard bushing. You can just make out the webbed openings on the inner E90 bushing in the picture. Despite the changes in shape and bushing the arm length and ball joint angles are very similar. 」
感謝聯結 所以上連桿還是比較粗點 不過聯結裡面也說到SUB-FRAME從E90 全鋁合金 改成鋼的 可能是基於成本考量 The biggest change up front is the steel sub-frame. BMW used an aluminum sub-frame on the E90 to save weight. The front and rear sub frames are the largest single components on the car and probably the heaviest after the engine. Why BMW reverted to a steel sub-frame (E46 generation technology) when weight savings was such a priority on the F30 is still a mystery.
"In another bizarre reversion to steel the F30 rear suspension is all steel, where the lower link on the E90 was aluminum. The other four links are made of stamped steal, like the E90 but the F30 links appear thinner, but also more refined."