Agency Power has many different sway bar kits available for our popular applications.  Engineering sway bars requires taking into account many different variables to ensure a proper chassis balance.  When tuning the suspension, you also want to take into account your spring rate of the coilovers, tire compound, and chassis weight.

When comparing anti-sway bars of same configurations, both made of solid steel alloy, different diameter bars can be directly compared.  Larger diameter bars have a higher bar (spring) rate.  If the bars are wider, or have longer arms (moments) they cannot be directly compared.  We measure in pounds-per-inch at the end link, just like a coil spring.  The adjustment holes change the rate in a direct linear relationship as well.  Sway bars are just torsion springs, but they effect the chassis much differently than a chassis spring.

Note that anti-sway bars are used for tuning both the roll rate and chassis balance (oversteer-understeer), and this is not just a “more-is-better” approach.  The chassis setup (springs, shocks, bars, alignment, tire-wheel selection, etc.) is more important as a whole than any one element.  Bars are for tuning!  German cars are usually tuned light on sway bars, as much of their tuning philosophy is based on high-speed testing.  Here, US enthusiasts appreciate lower speed cornering, as our “fast motoring” is much more limited.  Tight corners at lower speeds are more fun (and faster) with less body roll, as the tire contact patch is larger and more stable.