Since the notion-spring ratio is squared, small changes have a big impact. Wheel Rate = Spring Rate * (Motion Ratio ^ 2) * Spring Angle Correction. Wheel rate can be easily changed by modifying the bellcrank’s motion-spring ratio (i.e., changing the length of one of the bellcrank’s arms). Ride height can be adjusted by changing the length of the pushrod without changing the pre-load on the springs.Ĭorner balancing can be done via adjustment of the pushrods.īody roll is reduced by relocating some weight towards the center of the car. Unsprung weight is reduced because the shocks, springs and reservoirs are supported by the chassis rather than the lower control arm. If you look at the picture above, it’s clear why packaging is critical for open-wheeled cars. Specifically, the shock can be placed inside the body (i.e., out of the air stream) and the width and height of the body can be drastically reduced because there is a high degree of freedom with respect to shock placement. Packaging: pretty much all open wheel race cars have pushrod suspensions because they allow aerodynamics to be optimized. Pushrod suspensions have the following advantages: While a few exotics have pushrod suspensions most production-based racers such as the Porsche GT3 Cup, a Spec Miata, or a Spec E30 have a conventional configuration. This is an exotic architecture found on Indy Cars, formula cars, prototypes and other pure race cars. The rear suspension uses pushrods and bellcranks (aka rockers) rather than the conventional configuration in which the shock absorbers are mounted directly to the lower control arms.
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