Lateral support in rear axle

As an experiment the trials to know how much does the hardness of bushes in lateral supporting arm hinge affect on the steering reaction, using EP82 TOYOTA Starlet with rear 3 linked lateral rod supporting rigid axle.

The method of changing hardness of butyl rubber bushes were tightening and loosening on the hosing side support.
Steering actions on the scenery changed suddenly that exceeded a specific certain hardness, in another words there existed some clicking point on the hardness in the transient curvature.

This point must be influenced by all the 3 dimensional, physical and dynamic movements.
Too soft and deformable setting on these compliance makes the initial steering reaction dull, heavy, muddy and sticky, because the signal to turn from the steering would be consumed by the lateral movement(too much application of lateral compliance) of rear axle construction.

Recent rear axle designs of F/F models have these kind of tendency, muddy steering habit, because the design has the intention to distort the axle itself from the beginning, so designed to displace at all. Far from a cheerful astringency once an UK light weight sports cars had as a natural identity.

In addition to the upper description there exist inevitable broad dead zone in centric steering position.
This zone is often utilized as a way to cheat the ill wheel alignment setting, and sometimes to make the users as steering stability.