Suspension development for a short circuit racing car

Abstract

[Abstract]: This report investigates the suspension parameters required to alter a modified mass produced car for use in the short circuit racing environment. The cornering force and handling characteristics of the car are to be altered to result in faster cornering speeds and resultantly reduce lap times. The required research was undertaken and the necessary modifications were evaluated. The roll centre locations were found to have the largest effect on the cars weight transfer characteristics and balance, and hence the investigation into their location was undertaken in the interest of increasing their optimization. The fitment of front roll centre adjusters was analysed and the positive results justified their fitment to the front suspension. A Watts Linkage was designed and fitted to the rear suspension and the modification and adjustability of the rear roll centre was the result. The roll centres were effectively raised in the front and lowered in the rear to alter the weight transfer and jacking forces. The race car was physically tested both before and after the modifications were completed to ensure that a fair ground for comparison was available. The differences in tyre temperatures, cornering g forces and the driver’s evaluation of the modifications have resulted in positive outcomes for the cornering potential and handling parameters. The new roll centre locations have resulted in a car that is more neutral in its handling characteristics. The modified roll centre locations have also introduced a new situation for the suspension development and further testing and suspension modification are recommended. Recommendations for supplementary investigations are included in the interest of further increasing the effectiveness of the performed modifications.