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      02-27-2013, 04:15 PM   #10
HighlandPete
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Drives: BMW F11 535i Touring
Join Date: Mar 2007
Location: Scotland, Highland Region

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Quote:
Originally Posted by DR-JEKL View Post
From what I have read the FSD's do seem to fail more often then the koni sports, and that the sports are a better damper from an engineering/reliability view.
I did quite a bit of research on the Koni FSD before getting mine.

Some of the issues with Koni FSDs were due to users not grasping what this damper is really about. Many were fitting wrong aftermarket springs, too short and/or too high a spring rate, to let the FSD work properly. Some were hitting the bump stops and causing premature issues with performance and longevity. Koni had great pressure to mate them to aftermarket springs, where as a design concept they were made to replace OEM dampers and work with stock suspension parts. I really think even running with Eibach springs is a bit of a compromise, even if they are made as kits.

I ran mine for over 5-years and over 40k miles, with stock springs, sold the car with them still fitted and working well.

HighlandPete
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