Originally Posted by 1LE_Concept_Project
How do the spring rates compare to stock springs? Is it stiffer? And how much?
Eibachs are a progressive rate spring:
FR 143- 222 lbs/in
RR 291 -485 lbs/in
Stock is (I believe from what I can find)
FR 165 lbs/in
RR 370 lbs/in
For the street progressive springs are fine, but for those those that will track their cars I would recommend a linear rate as they are more predictable.