[quote author=Focused link=topic=66080.msg1135349#msg1135349 date=1168042231]
[quote author=Judd link=topic=66080.msg1134922#msg1134922 date=1168029384]
I'm really not that convinced that bigger sway bars will improve performance that much. The stock size of our sways is about the same as most aftermarket ones, and not much smaller than even the most hardcore aftermarket bars. My guess is that most of the flex is coming from the sloppy rubber mounts that mazda used. I think just swapping in a better set of bushings and possibly adjustable endlinks will give people the performance they are looking for.
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It's all relative. The issue isn't so much the size in absolute terms, but the size in relation to your ENTIRE suspension setup.
Sway bars aren't used to reduce flex, necessarily, or body roll, especially with the MS3 suspension design. They shouldn't be confused with the theoretical purpose of "stress bars".
Sway bars help the springs/shocks operate more effectively in rotating balance of a vehicle in motion.
EDIT: quick link to give a basic overview regarding the purpose of sway bars.
http://www.houseofthud.com/cartech/swaybars.htm
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I'm not a suspension expert, I think I didn't describe what I meant with the right words (or maybe I have the totally wrong idea in my head!)
The flex I was talking about is the flex of the sway bar setup itself. People usually look for a stiffer setup because it translates more of the force from the outside strut to the inside strut when cornering. My theory is that the sway bars on the MS3 are beefy and have very little flex, but the rubber bushings they are mounted in are very soft and allow a lot of play.
I picture something like this happening: The outside strut is compressed in a corner, which pulls the end of the sway bar up towards the body of the car. This should translate into torquing the bar, and causing it to rotate, which at the other end of the bar translates back into an upward force on the inside strut. At the same time, the whole thing is happening in reverse as the inner strut wants to extend in the corner, and push down on the sway bar, translating a downward force back to the outer strut.
Instead what I think is happening is X% of these forces are being absorbed by the rubber bushings, and deforming them, instead of twisting the bar. The outer strut is pulling up on the bar, which deforms the outer bushing by pulling up on it. At the same time the inner bushing is getting deformed in the opposite direction. This has two effects, the first is that X% of the force was lost, which is bad for the reasons mentioned in the link above. The second thing is that now the geometry of the sway bar has been thrown off (maybe by a few degrees), because the rubber is soft, the outer strut can compress more than expected, and the inner strut can extend more than expected, even though the sway bar itself is not flexing.
Does that make any more sense?