It is said that 2011 BMW 1 Series will be equipped with seven-speed dual-clutch gearbox, this transmission are only equipped in the current BMW Z4 cars and a few European cars.The cars who are equipped with DCT includes 335i,M3 and Z4.And it is also reasonable that Bmw 1 Series is equipped with DCT.

What is DCT?

A discrete cosine transform (DCT) expresses a sequence of finitely many data points in terms of a sum of cosine functions oscillating at different frequencies. DCTs are important to numerous applications in science and engineering, from lossy compression of audio and images (where small high-frequency components can be discarded), to spectral methods for the numerical solution of partial differential equations. The use of cosine rather than sine functions is critical in these applications: for compression, it turns out that cosine functions are much more efficient (as explained below, fewer are needed to approximate a typical signal), whereas for differential equations the cosines express a particular choice of boundary conditions.(FROM wikipedia)

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