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      09-05-2019, 11:25 AM   #46

Drives: F80 M3, 228i THP, E46 ZHP
Join Date: May 2009
Location: Ann Arbor, MI

iTrader: (0)

Originally Posted by Alan l. View Post
good work Racer20.

The L and R top hats are the same so makes me wonder why everyone only has this noise on the drivers side.... I've had this noise with a brand new top hat installed so its not that. Is it possible that on lowered cars there isn't enough preload from the spring as the shock un-compress itself?

The top hat itself is the same, but it's rotated into a different orientation in-car. Check list 10 . . . I suspect the load path doesn't line up as neatly with the recessional motion path on the passenger side.

I think the 5 bolt mounts were an attempt to fix this problem, but didn't completely eliminate it. I've driven another members 2017 car in my test bump and the noise is there but mine is significantly worse.

Now the tough question: how to fix it?
2015 M3, 2005 330i ZHP, 2015 228i 6MT Track Handling Pack, 2007 M Coupe (Sold)