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Increasing preload by compressing the spring will not increase the stiffness of the suspension. What it does is shorten the compression stroke which decreases the spring's ability to absorb bumps and decreases the damper's ability to control the spring, making the car ride rougher. It also brings the damper body closer to the bump stops. When your car hits the bump stops, your car rides rougher and gives you that po-go effect.


The only way to increase the stiffness of a suspension is to increase spring rate. Increasing compression damping (which is what all the single adjustable dampers do like the N+) is slow the rate of compression. This makes it feel stiffer, but not actually stiffer.

The more you know.
 
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