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Bottoming Hds (archive)

[ Follow Ups ] [ 5-series (E28) Message Board ] [ Msg. Board FAQ ]

Posted by Rob Anderson on February 01, 2001 at 18:41:40:

In Reply to: RD springs with Bilstein HD posted by TCD on February 01, 2001 at 15:40:58:

They will bottom on anything mildly bumpy. I have had Bilstein sports bottom. HDs are specifically made for stock springs and M5 swaybars. Go with Bilstein sports or Koni Sport Yellows. The whole reason this happens is as follows. A SPORT shock has a shorter piston. This allows the shock to compress more. Now when you use a lowing spring, the car can get closer to the ground before you reach coil bind. Coil bind is the absolute lowest the suspension will go. Now if the piston in the shock is too long, it will hit the bottom of the shock casing before the spring reaches coil bind. This especially on a Bilstein will damage the shock. The HD does not have a shorter piston so if you are driving through a corner hard and you hit a bump, the HD will bottom where the SPORT won't. I have first hand experience. Also the HD will not be valved strong enough for the springs. This means that the car will bound. I even found this with the Bilstein sports with my RD springs. I then went to Koni Sport Yellows and haven't had a problem since.

THIS IS THE REAL DEAL, DON'T USE HDs UNLESS YOU DRIVE ON GLASS EVERYDAY!!

Rob
M535i SIG Chief Technical Advisor
www.m535i.org



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