"curious about the physics behind that statement. A little body roll helps in low traction?"
It's complicated. Most things about suspension are, and most discussions about suspension here cheerfully ignore the complications.
The fitrst thing is that soft suspensions basically have better traction, since they allow the tire to follow the road better. The second thing is that the car has to be stiff enough not to bottom out. The third thing is that, at the front, wheel travel leads to undesirable changes in wheel camber. The fourth thing is that the shocks need to be able to control well whatever wheel travel you have. A good setup has to balance all these things out, and the relative importance of the things varies depending on how, where, and in what weather the car is being used.
The bottom line here is that, in the snow, you're not going fast enough to have much wheel travel, and so the first thing is the most important.
It's complicated. Most things about suspension are, and most discussions about suspension here cheerfully ignore the complications.
The fitrst thing is that soft suspensions basically have better traction, since they allow the tire to follow the road better. The second thing is that the car has to be stiff enough not to bottom out. The third thing is that, at the front, wheel travel leads to undesirable changes in wheel camber. The fourth thing is that the shocks need to be able to control well whatever wheel travel you have. A good setup has to balance all these things out, and the relative importance of the things varies depending on how, where, and in what weather the car is being used.
The bottom line here is that, in the snow, you're not going fast enough to have much wheel travel, and so the first thing is the most important.
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