BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

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      06-24-2019, 08:58 PM   #23
ShocknAwe
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Subframe bushings are the backbone of the rear suspension. Fine if you don't want to do it but just be aware.
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      06-24-2019, 11:47 PM   #24
John_01
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In a stock 135i, the rear subframe bushings are *very much* a part of the suspension.
1) They are used to absorb the road vibrations transmitted through the RFT tires.
2) They are claimed to place an upper limit on the maximum rear spring rate that can be used. (reference from TC Kline)

Only after you replace the bushings with a hard rubber/elastomer or solid metal component, then it can behave like a structural component.
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      06-25-2019, 03:10 AM   #25
Traf
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Subframe should be directly mounted to the body as it was done and i still done on many BMW.
Hard enough PU is close enough.
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      06-25-2019, 05:43 AM   #26
vincefreeflyer
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I think my solid polyurethan bushings are closers than metal component compared to stock bushings.
While installing a metal bar on it, it was impossible to have a deformation but on the stock ones it was possible even with a screw driver ...
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