25/06/2026
We were working with Kai Hyttinen Mitsubishi Mirage. It has other companys arms kits and tubular subframes, and driving issues. The front of the car had typical Mitsubishi tubularframe problem, steering rack was not in align. When left side had toe-in, the right side had toe-out in bump. Front was easy fix, we aligned the steering rack, and fixed bumpsteer. But the rear.... What a mess, we made atleast 20 different tests with different arms setup, with standard arms, with european made tuning parts, Rallyart R4 arms, and with our own parts and all kinds of combinations. There were four different problems with the arms. A. excessive bumpsteer, B. excessive bumpsteer which changes direction of steer. C. excessive camber gain D. Excessive camber gain which changes direction of gain. Conclusions: if you want the rear suspension to work as it should work the the most sure way is to use standard arms with uniball joints. That setup works always. The second choise is Rally Corsa Shop arms, they work as good, or better. Forexample R4 arms with standard measures rear subframe was terrible. Allkinds of mixups with the arms were terrible. This car also had very long shock travel, and that is something Evo rear suspension cannot tolerate. If the droop is extra long you end up with huge geometrical problems. When the tire goes down, and when the standard shock travel goes over, the upright starts turning clockwise and then all goes wrong. The most important arms are the toe-arms and camber arms and their mounting points. TCA isnt so important cause its throught spherical jointed. Longitudal tension arm is also having issues with the height of rotation. The closer the joints turning point is to the upright, the better the suspension behaves. And the closest there was are our arms. Forexample the longitudal tension arm joint height affects to bumpsteer.
Lets hope Kai is now more happy with the driveability of the car. Before this it was nearly undriveable.
www.uniball.fi