Lamborghini Murcielago LP640 Roadster (2007)

Gears and drive - more efficient and more resistant

Higher performance and torque naturally mean increased demand on the drive components. A six-gear transmission adapted to these requirements, plus a stronger rear differential and new half-axles, have therefore been deployed in the new Murciélago Roadster. An e-gear transmission with a newly tuned thrust mode (acceleration program) is also available as an option.

Like its forerunner, the new Murciélago Roadster LP640 has permanent four-wheel drive. This is based on Lamborghini's proven VT-system (Viscous Traction), which is self-regulating without the aid of electronic controls. In standard cases the drive force is distributed between the front and rear axles at a ratio of 30 to 70. An independent control loop adjusts the distribution of the drive force depending on dynamic oscillation, weight distribution and the relative friction values in synchronisation with the Visco clutch. In extreme cases, up to 100 percent of the drive force can thus be applied to one axle.

Electronics - closed loop for total control

Innovations have also been made to the electronics. With a closed loop control system the revised electronic control units improve the road performance and the response characteristics of the engine. All engine and vehicle parameters are controlled and monitored through a combination of three 'master' and one 'slave' control units. These are two electronic control units of the Lamborghini LIE type: a Lamborghini GFA (Gestione Funzioni Ausiliarie, i.e. Auxiliary Function Control) control unit and a Lamborghini PMC (Power Motor Control, i.e. slave unit). These control units are interconnected by means of a CAN bus.

Frame and chassis

Although the Lamborghini Murciélago Roadster LP640 is principally based on the Murciélago Coupé, it has further distinguishing features beyond its distinctive appearance. First and foremost, newly designed frame structure parts made of steel and carbon fibre guarantee an unswerving torsion resistance even without a roof. A special reinforcement structure in the engine area makes a major contribution to this aspect. This optically distinctive reinforcement can also be delivered in carbon fibre on request. Without impairing the extreme character of a typical roadster, a canvas roof (R.top) can be fitted which, true to the design tradition of this type of vehicle, is principally conceived for temporary use (for example in a sudden shower of rain) and for speeds of up to 160 km/h.

With its characteristic wing doors, the bodywork of the Murciélago LP640 Roadster is still made from an extremely high quality combined structure of sheet steel and carbon honeycomb. The combination of these materials is achieved by bonding and riveting.

The road performance, handling and stability at high speeds benefit from the use of new springs and stabilisers as well as the revising of the electronically controlled silencers. The anti-dive and anti-squat properties of the axles which effectively prevent brake diving and squatting, remain unchanged. The springs (two for each rear wheel and one for each front wheel) and silencers are coaxially aligned.

The new aluminium Hermera rims measure 8 ½" x 18" at the front and 13" x 18" at the rear. The vehicle is equipped with mixed tyres of the type PIRELLI P Zero "ROSSO": the Murciélago LP640 Roadster is driven at the front on tyres with the dimensions 245/35 ZR 18 and 335/30 ZR 18 at the rear. Pirelli P Zero Corsa tyres are available as an option: particularly appropriate for use on race tracks.

Brakes and safety

It goes without saying that a super sports car such as the new Lamborghini Murciélago LP640 Roadster goes hand-in-hand with a high level of safety.

Its hydraulic dual circuit braking system with LP-brake servo (unit) ensures impressive delay values under even the hardest strain. The internally ventilated brake disks measure 380 mm x 34 mm at the front and 355 mm x 32 mm at the rear. The closed loop of the four-channel anti-lock braking system (ABS) is enhanced, with electronic braking management (DRP) and traction control (TCS). The system consists of an electro-hydraulic control unit and four sensors for the wheel speeds.

When extremely high performance braking is required it is possible to equip the vehicle with carbon ceramic brakes measuring 380 mm x 36 mm with six-piston-brake callipers, which reduce pressure on the brake pedal and shorten the braking distance. Even under the toughest strain, there is almost no brake fading. Substantially reduced weight and greater durability are further advantages in addition to the carbon ceramic brakes' attractive appearance.

The new Murciélago LP640 Roadster meets rigorous standards in terms of passive safety. With two front-seat air bags, a 60-litre airbag on the driver's side and a 130-litre airbag on the passenger side, it meets all existing world-wide standards in the event of head-on and side crashes, impact against poles, occupant safety in the case of accident, fuel supply integrity and fuel combustibility. The luggage compartment also complies with childproof safety regulations. The Murciélago LP640 Roadster has automatically lowered roll bars; if the electronic control of this device detects a critical situation, the roll bars shoot out behind the seats within just a few milliseconds.