[DAEMANO]

Hysterisis...

I've posted this a few times. It goes into some detail about the thoughts behind the BRZ tS (including its' strut bar).

http://www.motortrend.com/news/subar...s-first-drive/

....Hysteresis is the lag between when the steering wheel of a vehicle is turned and when the vehicle actually begins to turn. Reducing hysteresis has been achieved in sports and race cars by increasing body rigidity via traditional braces and stiffeners. Slop in the chassis from soft springs and rubber bushings can be lessened via harder durometer substitutes, including solid mounts or metal spherical bearings (which the tS also has in the rear suspension linkage). These provide little to no give whatsoever but then introduce other problems, chiefly harsh ride quality, as road vibrations have nowhere to dissipate but up through the seat, steering wheel, and ultimately the driver’s fillings.

This is where the innate flexibility of the BRZ’s chassis and the controlled flexibility of the tS parts seem to work together. STI engineers explained that the flexible strut tower brace and draw stiffeners promote rigidity only in certain directions. The spherical bearing equipped strut tower brace apparently adds structural support across the shock towers for great steering response while also allowing for a bit of vertical movement that is key for maximum tire contact, and a smooth ride...