To alter the height of the car on a coilover, simply tighten or loosen the bottom spring cup to either tighten or loosen the spring. A tighter spring/lower car means a harder ride and a looser spring/higher car means a softer ride. The dampening adjustment gives you some room to make the ride softer or harder (depending on your lowness). This is done with a rod that slides into the top of the damper and adjusts the internals of the damper, allowing it to compess more or less.
Well that's my understanding of it![]()
Tightening and loosening will only change the stiffness of the ride if the spring is of a variable rate which I believe most are these days.
I was also wondering what changes in camber are caused due to lowering the car? E.g -.5deg for every 20mm lowered?