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Originally Posted by Dezoris
The general rule is that the purpose of anti-sway bars from the factory is to make the shock spring combo soft, for a comfortable ride, and to add antisway bars to counter the effects of roll. Sway bars are bandaids to counter roll. If your shock spring combo is stiff enough and low enough to reduce roll center and manage pitch and roll, the less need you have for sway bars.
The exception is that you can use them to promote under or oversteer, if your suspension is still not balanced to your liking.
In our most recent discussion we talked about how Tein spring rates are excessively front biased.
Spring rates of 448 in the front 224 in the rear, the car will naturally push or understeer, with a setup like this. To counter the effects to bring the rear around you would add a rear sway bar or add one with increased stiffness.
Does this make sense?
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I'll add to this though, if you can, DO get swaybars. This is just a personal preferance though. If your springs/shocks are stiff enough to counter body roll by themselves like Dezoris mentioned about, then you probably won't be driving the car on the streets as it'll be WAY too stiff for you. This is why swaybars are good. You can have a softer suspension, but still reduce body roll by using them.
I'm getting 2kg stiffer springs installed on my car today, and last night I pulled off my 22mm Teg Type-R rear swaybar I have on my Civic so that I could put some poly bushings on it that I picked up. After pulling the bar I drove the car around a little and WOW what a differance that bar made. I mean there was so much body slop, I think it had more roll than a 300lbs woman!
But seriously, it really does make a differance. Front end plow on curves was much greater, and the car just didn't feel very tight at all. I don't have a front swaybar though (never have) so that kinda works in my favor when I have the ITR rear bar on, helps to promote even more oversteer than what it would otherwise. But like Dezoris said, manufactures generally use bars as a bandaid to compensate for the alternative that they wouldn't be able to do if they didn't use them but wanted the same results.