BMW UK has announced the first details of the new BMW 1 Series Convertible, the world's first premium convertible in the compact segment. Powered by four- and six-cylinder engines, from the entry-level 143hp 118i Convertible to the 'bahn-storming 306hp 135i Convertible, the open-topped 1 Series uses elements of BMW's EfficientDynamics programme to deliver high-performance, economical and low-emission, roof-down motoring.
From the rear, the boot lid finishes in a discrete lip spoiler that houses the integrated third brake light and typical L-shaped rear light clusters use LED-powered light conductors.
The interior of the new BMW 1 Series Convertible features stretched horizontal lines that visually dominate the cockpit. With space for four occupants and 305 litres of boot space with the roof up (260 litres with the roof down), there is plenty of room to convey occupants and luggage over the longest of journeys.
In line with the recently launched 3 Series and 6 Series Convertible, owners of 1 Series Convertible models benefit from SunReflective Leather Technology whenever leather seat coverings are specified. BMW is the only manufacturer to offer this innovative technology that uses 'cool pigments' during production to reflect infrared rays of sunlight. This reduces the surface temperature of the seat surfaces by up to 20 degrees Celsius when compared to conventional leather upholstery.
Also carried over from the new BMW 3 Series Convertible are specific settings for the air conditioning system. Alongside the standard 'gentle', 'medium' and 'intensive' settings, the system recognises when the roof has been opened and defaults to a 'convertible' mode. In this situation, the ventilation control reacts less to the interior temperature and more to the outside temperature and sunlight factors to establish the intensity of the ventilation supplied.
Safety is of paramount importance for BMW and the 1 Series Convertible comes with an additional tier of protection in the event of a roll-over. A sensor registers an imminent danger and, alongside the relevant airbag deployment, two roll-over bars extend from behind the rear seats in a fraction of a second to protect the safety cell.
At its launch, the new BMW 1 Series Convertible will be offered with four petrol and one diesel engine. The five launch models are:
BMW 135i Convertible
Straight six cylinder petrol engine with Twin Turbo and High-precision direct injection.
Capacity: 2,979cc. Output: 306hp at 5,800min. Torque: 400Nm at 1,300-5,000min. Acceleration from 0-62mph: 5.6 seconds. Top speed: 155mph (electronically limited). Average consumption and CO2 emission figures not yet available.
BMW 125i Convertible
Straight six cylinder petrol engine with magnesium aluminium alloy crankcase, double VANOS and VALVETRONIC. Capacity: 2,996cc. Output: 218hp at 6,100min. Torque: 270Nm at 2, 500min. Acceleration from 0-62mph: 6.8 seconds. Top speed: 148mph. Average consumption: 34.9mpg with CO2 emissions: 195g/km.
BMW 120i Convertible
In-line four cylinder petrol engine with High-precision direct injection. Capacity: 1,995cc. Output: 170hp at 6,700min. Torque: 210Nm at 4,250min. Acceleration from 0-62mph: 8.4 seconds. Top speed: 137mph. Average consumption: 42.8mpg and CO2 emissions: 158g/km.
BMW 118i Convertible
In-line four cylinder petrol engine with High Precision Direct Injection. Capacity: 1,995cc. Output: 143hp at 6,000min. Torque: 190Nm at 4, 250min. Acceleration 0-62mph: 9.3 seconds. Top speed: 130mph. Average consumption and CO2 emission figures not yet available.
BMW 120d Convertible
In-line four cylinder diesel engine with turbo charge and common rail direct injection. Diesel Particulate Filter fitted as standard. Capacity: 1,995cc. Output: 177hp at 4,000min. Torque: 350Nm at 1,750- 3,000min. Acceleration 0-62mph: 8.1 seconds. Top speed: 138mph. Average consumption and CO2 emission figures not yet available.
The new BMW 1 Series Convertible is the latest in the line of BMW models announced in 2007 to benefit from a raft of performance and economy measures under the banner of BMW EfficientDynamics.
Brake Energy Regeneration features on all models and uses intelligent Alternator Control and an Absorbent Glass Matt battery to harness engine power that would normally have been lost during engine over-run or braking. An optimum gear shift indicator also features on all manual-gearbox cars to inform the driver of the appropriate gear for the most economical driving.
All models feature a new, clutched air conditioning pump. When not in use, the pump decouples and uses only 200 watts, or ten per cent, of the normal power needed to drive a conventional pump. In addition, other than the range-topping 135i Convertible, all models feature electronic power steering. In contrast to conventional hydraulic power steering, the 1 Series' electronic system operates on an 'on demand' basis, reducing engine output normally needed to power the steering hydraulics.
All four-cylinder manual gearbox cars feature BMW's Auto Start-Stop system as standard. In urban traffic, when the gear is deselected and the clutch pedal raised, the engine automatically cuts out, thus eliminating emissions and any fuel consumption while static. When the traffic starts moving, the clutch is depressed in order to select the gear to pull away and, immediately, the engine fires back into life.
All BMW 1 Series models feature a six-speed manual gearbox as standard with owners able to opt for a six-speed automatic gearbox on all models. Steering wheel-mounted paddles enabling manual shifts of the auto 'box are standard on 135i cars and optional on 125i models.
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