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
    At a glance At a glance 1 System on/off, interrupt 2 Resume speed 3 Store speed 4 Store, maintain/change speed Switching on Press the button on the steering wheel. The marking in the spee ...

    Adjusting the side extensions
    Fold the side extensions on the head restraint forward for increased lateral support in the resting position. ...

    Interior
    The 135i's interior design is fairly traditional, with more upright shapes than sweeping contours. Dual-zone climate controls sit below the center air vents and optional navigation system, with BM ...