JFern
01-07-2017, 12:33 PM
Anybody have experience with these? They're polyurethane inserts that fill the voids in the factory rear subframe bushings, and allegedly they can extend the life of the factory bushings and help prevent mount failure. I wasn't aware they made these until I read the Grassroots Motorsports journal on their E46 M3 build:
http://grassrootsmotorsports.com/project-cars/2004-bmw-m3/first-stop-our-new-m3-bimmerworld/
We had heard the stories about cracked unibodies and assorted other horrors. From what he could see, the rear subframe connection points looked good. Cracked unibodies are usually accompanied by destroyed bushings and abused cars, he said. Our bushings looked good.
Powerflex also offers inserts for the rear subframe bushings. If the stock bushings aren’t bad, these inserts should maintain the status quo and save the rear subframe mounts. Plus installing the inserts takes much less time than dropping the subframe to replace the bushings. James felt that our car was a good candidate for this fix.
The above advice comes from James Clay @ Bimmerworld. Color me interested!
http://grassrootsmotorsports.com/project-cars/2004-bmw-m3/first-stop-our-new-m3-bimmerworld/
We had heard the stories about cracked unibodies and assorted other horrors. From what he could see, the rear subframe connection points looked good. Cracked unibodies are usually accompanied by destroyed bushings and abused cars, he said. Our bushings looked good.
Powerflex also offers inserts for the rear subframe bushings. If the stock bushings aren’t bad, these inserts should maintain the status quo and save the rear subframe mounts. Plus installing the inserts takes much less time than dropping the subframe to replace the bushings. James felt that our car was a good candidate for this fix.
The above advice comes from James Clay @ Bimmerworld. Color me interested!