Twin-scroll turbocharging

The new four-cylinder engines also feature twin-scroll turbocharging. This means that the exhaust stream from cylinders 1 and 4, and the exhaust stream from cylinders 2 and 3, follow separate spiral-shaped paths to the turbine wheel. This reduces exhaust back-pressure at low engine rpm, allowing the energy of the exhaust gas pulses to be utilised as efficiently as possible. The result is instant throttle response and fast-revving performance which BMW drivers can instantly translate into driving pleasure.

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    Controls
    Almost all functions can be operated in the same manner as they are in the front. Special features of operating the system in the rear are described here. ...

    Deleting the button assignments
    1. Press buttons 1 and 8 simultaneously for approx. five seconds. 2. "OK" ...

    Indication of a flat tire
    The warning lamp lights up red. A message appears on the Control Display. In addition, a signal sounds. There is a flat tire or a major loss in tire inflation pressure. Reduce your speed and ...