Quote:
Originally Posted by Huz-Z
Re torsional stiffness, here is a quote from page 45 of BMW Z4, Design, Development and Production, by David Lightfoot:
"While the torsional stiffness of the Z3 had been 5,600 Nm, the Z4 achieves 14,500 Nm. That's two and one half times better without adding weight; a phenomenal achievement. The importance this development had on dynamic capabilities is hard to overstate. To provide perspective on the rate of technological change BMW has achieved, in 1990, the 8 Series, BMWs expensive technological tour de force coupe, was rated at 11,000 Nm. This was a closed car and the best BMW had ever achieved in a coupe!"
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Torsional rigidity:
Z4 roadster: 14,500 N·m (10,700 lb·ft) per degree of body twist
Z4 coupe: 32,000 N·m (24,000 lb·ft) per degree of body twist