(Scott Dorsey) wrote:

>Not all AWD systems are the same. The design of the center differential
>makes a big difference in performance and some use hydraulic coupling that
>allows the vehicle to drive very much like a RWD under good conditions.

A lot of FWD/AWD cars use those, and are essentially FWD until there
is major slippage, in which case the rears can kick-in some effort.
Lame, IMO. FWD cars really do NOT need it, and get-around well with
all-seasons. It doesn't hurt them them that they tend to have
narrower tires, too.

On the other hand, every RWD/AWD that I've read about boasts of a
nominal torque split of something like 30/70, with some variation
possible depending on conditions.