ntsqd
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I think it really depends on what you're going to ask of the suspension as to whether or not you can effectively damp both air springs and leaf springs with the same damper.
If you're very sensitive to suspension performance and tend to drive like you're pre-running Vegas to Reno then it just isn't going to ever work and any attempt to try is going to be an exercise in futility. At one time a truck that I worked on had both torsion and coil springs under the front of it. A hugely respected name in off-road racing dampers, whose product was on the truck and was carrying those coil springs up front, told us to make a choice because we would never, ever be able to get the damping to work well with both. Torsion bars have a huge rising rate and the rebound damping to control that would overwhelm a coil spring. Air springs also have a huge rising rate.
If you just want a smooth ride and you tend to drive just poking along then it will work.
If you're very sensitive to suspension performance and tend to drive like you're pre-running Vegas to Reno then it just isn't going to ever work and any attempt to try is going to be an exercise in futility. At one time a truck that I worked on had both torsion and coil springs under the front of it. A hugely respected name in off-road racing dampers, whose product was on the truck and was carrying those coil springs up front, told us to make a choice because we would never, ever be able to get the damping to work well with both. Torsion bars have a huge rising rate and the rebound damping to control that would overwhelm a coil spring. Air springs also have a huge rising rate.
If you just want a smooth ride and you tend to drive just poking along then it will work.