Originally Posted by
painterdave72
i couldnt find any info on them sagging...
I did find some info about sagging. From Eibach.
In short, look for other causes of the ride height change.
Taken from the Eibach Suspension Glossary:
Q: Spring Sag (aka: sagging)
The loss of spring load and length caused by a poor design, insufficient material or excessive loading beyond its physical limits. Over time, this can cause the spring to collapse or even break. There is a stress limit even for the best materials, but the max allowed stress levels are then superior. But even those high stress levels can be expanded by special production technologies - see Pre-Setting (aka: Blocking). All Eibach Performance and Motorsport Springs are preset to avoid any sagging.
Q: Pre-Setting (aka Blocking)
A complex production technology. All Eibach suspension springs go through the Pre-Setting process. Designed to expand the stress levels to higher limits each spring is compressed to full block, meaning all coils make contact under pressure. This allows new engineering limits to design superior products and to make springs permanently block-resistant - no more sagging! All product design characteristics will now be maintained for the life of the spring, unless damaged; physically or by corrosion.
For the record the Eibachs DMCH sold me were in an Eibach Performance Springs box so they must have been "preset". To avoid any sagging...