quattro Digest, Vol 82, Issue 41

[thejimrose]

the bumpstop adds spring rate at the end of the springs travel. nothing
right or wrong with it, just another tool at the engineers disposal to
tailor ride / nvh / performance / etc.

back in the day it was just an 'oh shit' button to keep metal form whacking
into each other. like everything else in an audi suspension, it's all grown
up and evolved into a somewhat more intelligent 'active' doodad.

still just a fancy polymer knob, mind.

http://performance-suspension.eibach.com/cms/motorsport_motorsport_products_emc_eibach_micro_cellular___secondary_springs__bump_stops_

Hah... Two things... Is it just me or does this "stop absorber" sound
> mysteriously like a bump stop?  And secondly, how is using a bumpstop to do
> the shocks job a good idea?  They should firm up the shocks and focus
> harder
> on the valving to keep it off the bumpstop in the first place, not make a
> bumpstop taht acts like a shock.  That sounds lazy in my opinion.  Then
> again, I think macpherson struts are a lazy/cop out design anyway.
>
>