Originally Posted by gagliano
I don't see how you can say that. Mono adjustable coilovers require you to make height adjustments by changing the preload setting of the lower perch. If I add zero preload to the coil, the unit will sag thus lowering ride height. If I add more preload by moving the lower perch higher up the shock body, the vehicle will sag less and the ride height will be taller. The differing spring rates you mention will determine how much pressure is exerted against the perch as I increase preload.
Then let me say it this way, dual adjustables make the changes by shifting CG to attain balance without making any changes to spring preload and sag; is this not better?
You aren't getting it. If you use a helper spring, you can raise and lower the spring perch WITHOUT preloading the main spring. What you're saying would be true if you used a single height adjustable body with only a main spring, but the helper eliminates the need to change preload on the main spring.