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Which effect does low torsional stiffness have on handling?

  • A.It has no effect
  • B.The vehicle understeers more strongly, because the twisting of the frame increases the effective roll stiffness
  • C.The suspension geometry changes as the structure twists
  • D.The vehicle becomes unstable in a straight line, since the flexing structure alters the wheel alignment continuously

Answer: C

A flexible structure acts as an additional spring in series with the suspension, so the carefully designed geometry is compromised and the response becomes vague and unpredictable. Achieving a stiff structure is therefore a prerequisite for good handling rather than a refinement. It also allows the suspension to be tuned reliably, since the designer knows where the mounting points will be. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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