BMW launched its 1-Series Convertible for Europe and North America in 2008. Like the Coupe, the Convertible model is offered in 128i or 135i variants.

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The 128i Convertible is powered by BMW's 3.0-liter, 230 horsepower inline six-cylinder engine generating 200 pound-feet of torque.

Like its fixed-roof stablemate, the 128i Convertible features Valvetronic valvetrain management and aluminum/magnesium cylinder block construction-core elements of BMW's EfficientDynamics.

The 135i Convertible, features BMW's twin-turbocharged 3.0-liter inline six-cylinder engine producing 300 horsepower and 300 pound-feet of torque from as low as 1,400 rpm.

With its direct piezo gasoline injectors, twin low-mass turbochargers and air-to-air intercooling, the 135i Coupe accelerates to 62 mph in 5.3 seconds. while the Convertible takes 5.6 seconds. Both engines feature on-demand engine coolant pumps that improve fuel economy and reduce parasitic losses for increased output.

On the outside

The 1-series Coupe sports a vaguely 2002-inspired shape, including the characteristic 'Hofmeister kink' in the c-pillar. The M Aerodynamic bodykit is standard on the 135i. On all models, the trunk lid includes an integrated spoiler. The 135i includes an additional lip spoiler for high speed rear downforce.

The L-shaped rear taillights include LEDs with Adaptive Brakelights, which operate in two stages in relation to brake application force.

Up front, Adaptive Xenon headlights are optional on the 128i and standard on the 135i. They'll also include integrated cornering lights and daytime running lights with two corona rings on each headlight unit, just like in other BMWs.

Step inside

First things first: BMW's controversial iDrive system comes only with the optional navigation system. The rest of the interior follows BMW tradition and includes galvanized pearl gloss surfaces on the interior door handles, glove compartment handle, the radio's rotary knobs, the knobs of the automatic air conditioning system, the (optional) iDrive controller and the ornamental trim strips on the steering wheel.

Leatherette will be standard on all models with Boston Leather as an option. The Sport Package, a BMW staple, will include sport seats with enhanced bolsters. A 60/40 split-folding rear seat is standard.

The latest version of iDrive is equipped with six Programmable Memory Keys that allow the driver to program functions that are used particularly often such as navigation destinations, radio stations or specific telephone numbers. Touch-sensative sensors on these buttons preview the function on the iDrive screen before the button is depressed.

The 1-Series should set some segment benchmarks with regards to the audio and entertainment system. Available and standard equipment will include: Sirius satellite radio, HD radio, a premium sound system and Bluetooth interface. For simple and straightforward connection of an MP3 player, an auxiliary input jack is standard, and a USB port for direct control of an Apple iPod or iPhone media player is available as an option.

Six airbags come standard, including dual front airbags, side airbags integrated into the seats and side curtain airbags in the roof lining.

Underneath

The rear wheel drive 1-Series Coupe has a sophisticated suspension system with an aluminium double-pivot front suspension and a five-link fully independent rear suspension in lightweight steel. Like all RWD BMWs, the 1-Series features 50/50 weight distribution. BMW's Dynamic Stability Control (DSC) also includes a Dynamic Traction Control (DTC) function that provides electronic intervention to prevent loss of vehicle control, but at a higher threshold before activation. Both DSC and DTC can be disabled entirely. The DSC system on the 135i Coupe is designed specifically for performance-oriented driving. For instance, the accelerator pedal has a quicker response rate and electronic rear brake management is used to simulate a differential lock for stronger acceleration in turns. BMW hasn't made any mention of a conventional limited slip differential. The rear differential features double-helical ball bearings for the first time, which reduces the amount of fluid required in the differential and reduces operating temperatures. Active Steering, a variable ratio steering system exclusive to BMW, will be optional.

The double-pivot spring and strut front suspension is made largely of aluminum.

M-inspired performance for the 135i

The 135i Coupe is no M1, but it includes a fair amount of M inspiration, including an aero kit designed to reduce downforce and increase brake cooling. A sports suspension is standard and includes 18' wheels, performance tires, a high-performance brake system with six-piston fixed calipers on the front and two-piston fixed calipers at the rear.

Diesel for rest of world

BMW will offer a 123d model with a 204 horsepower turbocharged diesel four cylinder in markets outside of the U.S. and Canada. This diesel motor is the world's first all-aluminum diesel motor to put out more than 100 horsepower per liter. Peak torque is 400Nm, around 295 pound-feet, and the 123d will run to 62 mph in 7 seconds, according to BMW. There is no word on U.S. or Canadian sales.