As far as i remember Mitsu 3000 GT had this system;nothing else?
Cico

 

The prelude did (stil does I think)
Andy

 

In which way does it help you in corners?
Any tester?

 

Skyline?

 

Skyline definitely, Mazda 626 and Mitsubishi Galant used to have 4ws verions too.

 

Some cars also have passive 4WS, through compliant bushes on the back end....

 

Passengered in a Galant with 4WS on the recce for the Scottish Rally a couple of times. Felt pretty weird - until the driver told me about the 4WS I thought we were well on the way to losing it anytime we went round a corner quickly!

 

Most active 4WS mechanisms are designed to allow a bit of oversteer at low speeds, to help manoeuvrability, by turning in the opposite direction to the front wheels. At higher speeds, they tern the same way to the fronts, to induce some understeer, to aid stability.

Honda's mechanical system does this by turning the rear wheels the same way as the fronts if the steering wheel is turned less than half a turn or so, but in the opposite direction if more than that amount.

The thinking is that if you do a lane change at high speeds, you'll only need to make a relatively small input to the wheel, and will benefit from the extra stability. If the manoeuvre that you are undertaking needs a large input from the steering wheel, the assumption is that whatever you are doing requires some helping oversteer.