Because torsion bars offer less isolation than independent systems, they can also allow more noise, vibration and harshness to filter into the cabin. So folks, if ride comfort is one of your primary requirements in a car, you may wish to consider the AWD QQ.
Torsion beam setups are relatively cheap and easy to manufacture, install and maintain, but they don't offer the engineer anywhere near the same amount of freedom to balance comfort, agility and stability as independent systems do.
Torsion bars take up less horizontal space than multi-link systems, netting more room for humans in the cabin and their stuff in the boot (Probably no difference between AWD / FWD QQs, would be interesting to know if this is the case though).
gvmdaddy wrote:Nissan opted to use the torsion beam as the rear axle configuration for two reasons, to save costs, and to stiffen the back end of the car to reduce pitch and roll. It gives a firm ride over potholes and speed bumps, but does lessen roll on cornering. Rear multi link set ups offer a softer ride over such obstacles but also lend themselves to roll slightly more on cornering. More high end vehicles can reduce this by offering hydraulic set ups that can be changed at will by the driver. These systems offer the best of both worlds but do put the purchase price up quite a bit. The reason Nissan use the multi link setup on the AWD variant is because the torsion beam setup would get in the way of the driveshaft and diff. If they could use the torsion beam setup then im sure they would.