Quote:
Originally Posted by CSBM5
This is exactly what happened. On the 330i I went with the B6 due to the guide from both Bilstein and TireRack at the time (car has ZSP) which was about two years ago. We bought the car new and it had ~130k on it, and the stock shocks were wasted, rear bump stops crumbled, etc. While the ride is much better over abrupt transitions (as you'd expect with Bilstein), it is too choppy over minor pavement undulations. If feels like the rear compression damping is too stiff in the mid-range shock velocity region. Ride height was raised almost 1/2" but I attributed that to the stock struts/shocks being shot coupled with the always slightly added spring rate a Bilstein provides.
If I had to do it over, I would either get the B8 or simply go with Konis.
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The Bilsteins do loosen up a bit as they break in, but I'm thinking that a small amount of bleed would make the ride a bit better.
Supposedly Shaikh from Fatcat motorsports has a way to modify the Bilstein HDs and other Bilstein monotubes to make them ride a little better, they call it a "ripple reducer". I think he just drills holes in the spool valve to let it bleed a little bit so that really small displacement movements are allowed by the shock.
http://www.fatcatmotorsports.com/index.htm#page-top
There was a thread on Bimmerforums somewhere where they mentioned it:
http://www.m3forum.net/m3forum/showthread.php?t=534318
lots of good stuff there.