February 28, 2002

BMW CS1 concept

BMW previewed a new small four-passenger convertible concept car yesterday which it will display at the upcoming Geneva Motor Show. BMW says the CS1 Concept Car offers a glimpse of the design philosophy for a new “small” BMW in the future.

BMW CS1 concept

BMW CS1 concept

BMW CS1 concept

BMW CS1 concept

BMW CS1 concept
Click image to enlarge

The CS1 uses a traditional BMW driveline layout for optimum balance and handling: a longitudinal front engine and transmission and rear-wheel-drive. Under the hood is BMW’s 115 horsepower 1.8 litre four-cylinder engine with Valvetronic valve control which is mated to BMW’s new SMG Sequential Manual Gearbox that allows the driver to shifts gear quickly via paddles behind the steering wheel.

The engine compartment is partly covered by flexible, heat-proof tissue and partly by fire-resistant carbon-glass fibre plastic. The flexible cover houses “cold” units and systems such as the air filters, the cooling and brake system indicated graphically on the reflecting surface. The “hot” components around the engine, for example the exhaust system, are housed beneath the carbon-glass fibre cover.

The CS1 features extra-large brakes measuring 335 mm (13.2″) in diameter at the front and 330 mm (13.0″) at the rear, together with racing brake callipers fitted with six pistons at the front and four at the rear. The standard tires are big 215/45R-18 inch performance radials in front and 235/40R-18 inch at the rear mounted on light-alloy wheels.

The CS1’s interior includes BMW’s new iDrive controls system. A controller in the centre console and a monitor enable the driver to operate all functions for comfort, communication, navigation, information and entertainment without having to first look for the appropriate controls and buttons.

An aluminium crossbar forms the central axis in the cockpit. It is supported by two wing-like swinging arms rising up out of the centre tunnel and extending to the two sides of the cockpit at either end. The right-hand arm is flexible and, when required, provides access to the bag-like glove compartment behind.

Dome-like surfaces appear to hover in space above the aluminium crossbar. Beneath this “roof” there is adequate space for the free-standing controls and instruments, the speedometer and tachometer are attached directly to the steering column. The two round instruments vary in size, borrowing a design theme already well-known from BMW motorcycles. They are surrounded by light rings reminiscent of the headlights’ new look.

The seat cushions, backrests and the steering wheel are finished in soft Nappa leather, while the side panels of the seat which are subject to greater loads come in soft, robust Nubuk leather.


Configuration: Standard drive (engine fitted lengthwise at the front, drive wheels at the rear)
Engine: inline-four with VALVETRONIC valve control
Capacity: 1,796 cc
Max output: 115 bhp at 5,500 rpm
Max torque: 129 lb-ft at 3,750 rpm
Transmission: SMG (Sequential Manual Gearbox) with shift paddles on the steering wheel and gearshift lever.
Wheels: 7.0 x 18 in. (front)
  8.0 x 18 in.(rear)
  Light-alloy rims
Tires: 215/45 ZR 18 (front)
  235/40 ZR 18 (rear)
  Hand-cut tread
Brakes: Racing brakes, six pistons at the front, four at the rear
Brake discs: 335 mm/13.2 in. (front)
  330 mm/13.0 in. (rear)

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