[naz]

ZTWsquared,May 23 2008, 05:05 PM Wrote:"Designed" to work with stock dampers? ... probably not - but of course Eibach wants to sell their dampers too.

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what i mean by this.. more specifically... is that each damper has a "range" of compression and rebound forces they can dampen effectively.. the exact value depends on the spring length and the spring compression rate. so if you take a spring that is very close in length to the OE spring, such as an H&R sport spring or (it seems like an eibach pro kit spring), then even though the spring rate has changed the damper is still working within its designed tolerance range.. and therefore does not need to be replaced.. based on your feedback it looks like the pro kit springs can work fine with stock dampers

by this reasoning.. the reason eibach sportline springs require other dampers is that they lower the car (almost certainly by changing the overall spring length) and also have different spring compression rate.. so this combination of shorter spring (which means less stroke for the damper) plus presumably higher spring rate to compensate for the reduce spring length.. puts the stock damper out of its designed range

for what its worth... this whole process of matching springs and dampers is very very tricky because most people (myself included) don't have the tech to correctly understand how to specify or adjust the compression and rebound settings of a damper to give the proper dampening curve for a given spring..... which is why for 99.9% of people going with a 'matched' set of springs and dampers is better... (hint: almost everyone you see at autoX twirling the knobs on their koni yellows has no friggin clue what they are doing)

EDIT: remove some stuff... to the OP. congrats on your setup.. focus ppl have confirmed your springs work with stock dampers.. so hurray!