sentences:  The 308 replaced the ageing March 731 chassis that the team had been using since coming into Formula 1 the previous season, and was loosely based on the March design.It was powered by the Ford-Cosworth DFV and when the car was first launched featured conventional front suspension comprising double wishbones with outboard mounted coil-spring damper units.Postlethwaite was looking for a way of fitting simple, lightweight progressive springing to the car and latched onto the idea of using rubber springs after a friend involved in designing rubber damping for buildings in earthquake zones suggested the idea.