Re: Eibach Spring Upgrade For 147
I can’t answer your first question, but regarding the second part, I would like to mention some things.
Ride height is defined by the spring, dampers don’t influence it. If you buy -40mm springs it might not be not exactly 40mm, but the variation will not be big 1-3mm at most.
When I installed my H&R -35mm, I measured the difference. Immediately after installation, the lowering was 32mm in the front and 34mm in the rear. After 2 months, when the springs bedded in, it was about 35-37mm. However, this is not scientific as tyre pressure difference and tyre thread wear in two months might have changed +- 1 or 2mm.
30-40mm lowering is in general considered as a maximum limit for use with standard dampers. It is still usable, but not recommended. Standard dampers are too weak to dampen the higher spring forces and frequency. And yes, they will wear out much, much faster.
You can use this combination, but start saving for new dampers as sooner or later you will have to change them. That’s sure.
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