Quote:
Originally Posted by Robin_NL
That active diff is only suitable for wet/snowy conditions.
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The Audi differential works anytime there is a rotational difference between the wheels; that is, in any sharp corner. It is more active, of course, when there is tire slip such as wet, snow, sand or high power transfer on asphalt.
Conceptually it is better than braking the inner wheel as employed by cars with an electronic differential, but electronic differentials work surprisingly well in practice.
The Audi's quatro system is more performance oriented than BMW's x-drive which is designed for snow. The S4 weighs close to two tons however so it cannot reasonably be described as nimble.