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ZF boss thinks 9 speeds is enough for transmissions

The nine-speed transmission might be where the race to add gears ends, ZF Friedrichshafen CEO Stefan Sommer said. He referred to nine speeds as the "natural limit" because going beyond that number adds weight and complexity that cannot be offset by gains in fuel efficiency. "There is no hard line, but you have to consider the law of diminishing returns.

Concept Car of the Week: Porsche Tapiro (1970)

By the late 1960s it was time for Porsche to create a new car that would replace its ageing entry-level model, the 912. Its sister company Volkswagen also needed a sports coupe to replace the Karmann Ghia and so the two brands joined together to develop what would become the Porsche 914. These days the 914 holds something of a ‘cool factor', generally considered as the ‘black sheep' in Porsche history.

Preview: Porsche Panamera

After what has already been the most drawn-out model introduction ever (the initial Porsche sketches of the new model having been revealed in 2005), Porsche has finally released the first official rendering of its forthcoming Panamera sedan, set to be launched in 2009. Though the plan view doesn't show much of the new Porsche's design, the company says the features will 'include a wide and low body offering dynamic proportions and muscular design'. But while the grand tourer will have a 'compact overall look', the interior space is claimed to offer a brand-new experience of roominess, with two single seats and generous headroom at the rear allowing adults to sit in comfort.