Over the last several months there hasn’t been much work undertaken on the supercharger system. However there has been several upgrades to the car which became necessary due to the extra power and torque being generated by the engine.
The first was the suspension. For the last 3 years I have been running Progress Technology springs, Koni yellow sport shocks, and Progress Technology sway bars front and rear. The spring rates with this setup are quite soft with stiff sway bars to manage body roll. This was fine with natural aspirated power levels, but with the extra power the car became tricky to drive because of corner entry oversteer and corner exit understeer due to dive and squat.
Time had come for coil overs and MCA reds were selected with 12 kg/mm spring rate in the front and 7 kg/mm in the rear. With the much stiffer spring rate sway bars were set to full soft front and rear. Initial test drive showed oversteer bias so rear sway bar was disconnected and this balanced the handling.
Adjustable rear lateral lower links and rear toe control links were installed as desired rear chamber angle could not be achieved using the factory cam bolt adjustment.
String alignment was performed and and ride heights set. A set of corner scales were hired to fine tune cross weights. Below are as-left corner weights with 82 kg in the drivers seat and 25 litres in fuel tank. With the supercharger in the back the weight distribution is more rear biased than it otherwise would be which was one of the goals of the project.
