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Body Flex




Although, for some time, body flex was a result of attempts to keep a car's weight down, makers such as Audi (the A8 ), and Jaguar (with the 2003 XJ8 ) have employed the use of Aluminium in chassis production to get around this obstacle, ensuring the weight of these cars and their level of body flex can ''both'' be kept to a minimum.

Typically, the stiffness of the body is measured in torsion. The body is supported at the spring caps at the rear, and then a torque is applied to the front spring caps via a long beam and a fulcrum. Values achieved range from 1,000 lb-ft per degree for pre-War racing cars, up to 25,000 lb-ft per degree for some modern production vehicles.