2013 BMW Z4 sDrive18i is the latest version of the popular Z4 roadster which is set to go officially on sale in March next year. The new model comes with a new entry-level sDrive18i, while at the same time the Pure Traction Design package enhanced the level of sophistication and high specification never seen before on Z4.

The engine is a de-tuned version of an existing 2.0-litre four-cylinder twin-scroll turbocharged one. It generates 156 hp (115 kW) at 5,000rpm from its 1,997cc powerplant. This means that the vehicle effortlessly accelerates from standstill to 100 km/h in only 7.9 seconds before going on to a top speed of 137mph. It manages to do this while still recording 41.5mpg and emissions of just 159g/km.

The other engines included in the model range are the sDrive20i, which comes with a 184 hp (135 kW) that achieves 41.5mpg and 159g/km CO2, and the four-cylinder twin-scroll turbocharged sDrive28i, and the six-cylinder twin-turbocharged sDrive35i and the sDrive35is which produce respectively 245 hp (180 kW), 306 hp (225 kW) and 340 hp (250 kW). All variants are rated at an electronically-limited 155mph top speed.

The power is transmitted through a six-speed manual gearbox as standard. Customers can also specify an eight-speed automatic with gear shift paddles located on the steering wheel, while buyers of the BMW Z4 sDrive35is have a seven-speed Double Clutch Transmission, again with gear shift paddles, as standard.

All versions come as a standard EfficientDynamics programme, which enhances engine's performance, economy and cuts emissions. The programme includes Brake Energy Regeneration, Electric Power Steering with Servotronic, Reduced Rolling Resistance Tyres, on-demand control of the engine's ancillaries and Optimum Shift Indicator on manual transmission cars.

In terms of exterior design, the Z4 has minor enhancements. For instance, the headlights now include white LED corona rings and a white ‘eyebrow' with additional chrome detailing, while in profile the side gill features chrome detailing and LED side repeater lights.

However, BMW introduces here the Pure Traction Design package, where the car is in Valencia Orange with an optional black contrast roof. The model also comes with Sport seats in Alcantara and leather with contrast stitching, Anthracite headlining and a unique metal weave interior trim.

Standard equipment across all models now includes DAB radio, Xenon headlights, Bluetooth, USB connectivity and Sport multi-function steering wheel. Three new colours of Mineral Grey, Glacier Silver and Valencia Orange are offered while two new styles of alloy wheel, 17-inch and an 18-inch V-spoke styling wheel are available as an option.

Another important feature here is the standard Drive Performance Control function that is another first and this allows the driver to alter, depending on model specification, the throttle and steering response, level of ride comfort, Dynamic Stability Control response and, on automatic or Double Clutch Transmission cars, gear change times.

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Model Price from Power Hp Torque Nm Zero – 62mph Seconds Top Speed Mph Combined Mpg CO2Emissions g/km
BMW Z4sDrive18i £27,610 156 240 7.9 (8.1) 137 41.5 159
BMW Z4 sDrive20i £29,710 184 270 6.9 146 (144) 41.5 159
BMW Z4 sDrive28i £34,095 245 350 5.7 (5.5) 155 41.5 159
BMW Z4 sDrive35i £39,915 306 400 5.2 (5.1) 155 30.1 (31.4) 219 (210)
BMW Z4 sDrive35is £45,795 340 450 (4.8) 155 31.4 210

Source: BMW