The Lamborghini Diablo was a high-performance car by Italian automaker Lamborghini between 1990 and 2001.
Lamborghini began developing the Diablo (which translates to "Devil" in Spanish) in 1985 as a replacement for the Countach model, introducing it for sale on January 21, 1990. Power came from a 5.7-litre, 48-valve version of the legendary Lamborghini V12 featuring dual overhead cams and computer-controlled multi-point fuel injection, producing a maximum output of 492 hp (367 kW/499 PS) and 427 ft·lbf (579 N·m) of torque. The vehicle could reach 60 mph (97 km/h) in slightly over 4 seconds, with a top speed of 202 mph (325 km/h). The Diablo was originally rear-wheel drive and the engine was mid-mounted to aid its weight balance.
The Lamborghini Diablo was somewhat spartan, featuring only basic radio functions (with optional CD playback) along with manual windows, adjustable but un-powered seats and no anti-lock brakes, mostly to minimize the vehicle's already high curb weight.
After campaigning the Lamborghini Diablo SV-R for four years in the Diablo Supertrophy Lamborghini launched a completely new car for the 2000 season. This Diablo GTR is a modified version of the 6 litre GT version of the Diablo launched in 1999. In comparison with the Diablo GT, GTR most important features are a modified chassis frame with integrated roll bar, improved suspensions, central fixing nut for the rims, race braking system, additional radiators for transmission oil cooling, very high performance rear wing (directly bolted to the chassis), simplified interiors and weight reduction. The engine is basically the same V12, 6 litre, of the Lamborghini Diablo GT which thanks to the adoption of a specially tuned exhaust system, without catalyser, delivers 590 hp (440 kW/600 PS) (575 in the GT model).
The engine management system is based on the proprietary Lamborghini LIE electronic engine control system tuned for racing. Fuel injection is sequential multipoint and ignition is static with individual coils. Lamborghini Data Acquisition System, LDAS, and diagnostic functions are integrated in the engine electronic management system.
For the engine cooling, two water radiators in parallel are side mounted to the engine and an engine oil cooler is front mounted as in the Lamborghini Diablo GT. Additional coolers for gearbox and differential oil are installed in order to better match the racing overloads.
The transmission is on the rear wheels through a Lamborghini 5 speed gearbox with one basic gear ratio option and an alternative option for a shorter 5th gear ratio. The gear box lever is in an asymmetric position on the central tunnel in order to be closer to the steering wheel, for better control. The steering system is power assisted.
The tubular chassis frame integrates the roll bar and is directly connected to the rear wing. The front suspension is modified for racing. Shock absorbers and anti-roll bars are adjustable. The rims are lightweight magnesium alloy with central fixing nut and they accept racing type tyres. A special racing fuel tank with fast filling system has been installed. The braking system is based on the Diablo GT high performance module. New racing brake calipers have been adopted to better match the very severe racing conditions.
Most of the body is carbon fibre made, except for the roof, which is made of steel for torsional rigidity, while the doors are made of aluminium, for safety reasons.
The cockpit fittings are simplified to meet racing requirements. The driver seat has been moved towards the longitudinal axle of the car, reducing the size of the central tunnel, to ensure a better driving position. Racing switches for ignition and for other functions have been adopted instead of the series push buttons. The fire extinguisher system is installed on the right side of the cockpit with activating switch on the tunnel. The driver's seat is of racing type with a six-point safety belt and the steering wheel is also racing type.
A production run of 30 cars was planned at the launch of the car at the 1999 Bologna Motorshow, but at the end of the run 40 cars were built.