REAS Suspension Diagram, Pictures and Information
Found in the 97.9-02 JDM Toyota Supra (RZ and SZ-R only) was the REAS suspension system – REAS (Relative Absorber System) shock absorber system.
I was lucky enough to have this suspension in my supra before I swapped it out a few years ago for some HKS hypermax coilovers.
I’ve posted a link below with some information on the system and also one of my favourite pictures of the supra, a chassis picture without the shell showing the REAS suspension.
Basically it was to improve ride comfort while still having good flat cornering ability. I’ve also put some pictures of mine when I pulled it out, I still have this available although I’m not sure if they can be re-filled or re-used.
(Translation from Toyota Japan – hence the japanese-english translation wording!)
REAS (Relative Absorber System) for comfortable ride and high handlings stability.
The REAS features an entirely new mechanism that functions not only to achieve a comfortable ride with a relatively small amount of damping force in cases like when both tires hit a gap in the road, but also functions to stabilize the body of the automobile against lateral “rolling” motion by adding a suitable amount of extra damping force and absorb the force acting in the lateral roll direction, as when cornering, when the pattern of depressions and protrusions in the road surface are different on the left and right wheel sides or when subjected to cross winds. Three main points of the REAS structure are as follows
1. The left and right shock absorbers have separate oil chambers with a REAS valve positioned on the connection flow passage.
2A single gas chamber is shared by the left and right.
3. Using the separate actions of hydraulic fluid and gas, a separating piston is activated by the coupled movements from the right and left.