It ties the front end together so that in corners as the outside ski loads and pushes up it forces the inside ski down so it can bite.
It also has the affect of increasing your spring rate and shock dampening.
sled_guy
I agree with the 2nd part but. When the outside ski is compressing, what is happening is the spring pressure from the inside ski is pushing down on the swaybar, transfering over to the outside ski, adding spring pressure to that side to help the outside ski from compressing.
If you get on a sled with a sway bar and tip it way to the right the left ski comes up in the air, its not getting forced down. With out the sway bar if you tip your sled to the right, the left ski stays on the ground but the right collapsses more.
I have prox and broke the sway bar off on my last ride last year, At the time I didn't know what happened, the sled felt a little less responsive in the turns when there were no bumps, when I hit some woods that wer really moguled up my sled was handling better, but could feel some out side ski bottoming.
Stopped at the gas station for a break, were all talking and my buddy asked me when I took the sway bar out. I said I didn't, I looked and it was busted off. I dialed in some more spring load and so far I like what I'm feeling.
This year I put a little more spring load in and added 1 1/2 spacer to the crossover stack of my 4 and 9 inch springs. this will get the 9 inch in play quicker.
I'm looking forward to running no sway bar at this time.
If you can prevent roll with the spring, along with having the inside ski on the ground without the sway bar, i may be ahead of the game.