Originally Posted by aidandj
Sexy billet mounts. I like that price point too. What improvements can one expect from a billet coaxial mount?
From my m.net post 15 minutes ago:
In short, the damper works better.
Two several differences over an OEM rubber bushing plate mount.
- The bearing eliminates any undamped vertical movement compared to a rubber, MCU or urethane bushing mount. This is a good thing.
- The bearing allows the damper to freely swing back and forth relative to the body as the suspension goes through its travel. A bushing mounts imparts resistance and banding load on the shaft at any time it's not dead center under the mount (pretty much all the time). This bending load creates seal drag and reduces damping accuracy.
- A coil springs does not compress in a perfect straight line like a telescope. It twists and bends as it is compressed. This deflection imparts bending and thrust loads on the damper shaft the same way the fixed mount does. The coaxial spring perch helps to isolate those forces from the damper.
In all, it's simply letting the spring and damper work independently without one affecting the others natural force curves. All pro level race cars have spherical bearing mounts. When there is space for it, they have some form of spring isolating perch arrangement, often on both ends. Probably 85% of spring deflection can be isolated from the damper with just one floating perch, that's why we do it that way.
Downside, a bit more noise inside the car from road texture.
Upside, your coilovers work much better.