Reduced, raw, authentic. With the technological concept of the Bugatti Bolide, the French luxury car manufacturer is now providing the answer to the question what if Bugatti built a radically light vehicle around its iconic 8.0-litre W16 engine? the Bugatti Bolide is the most extreme, uncompromising, fastest and lightest vehicle concept in the company’s recent history – with an incredible weight-to-power ratio of 0.67 kg per PS. This is made possible by the combination of the W16 engine with 1,850 PS and a vehicle weight of just 1,240 kilograms. The Bugatti Bolide achieves figures that are almost on par with Formula 1 while its top speed is well above 500 km/h – without compromising maximum handling and maximum agility. The Bolide takes 3:07.1 minutes to complete a lap of Le Mans and 5:23.1 minutes to get around the Nordschleife. The experimental study of the Bugatti Bolide is a track-oriented hyper sports car featuring a W16 engine derived from series production as powertrain combined with a minimal body for maximum downforce. It therefore promises to offer the ultimate Bugatti performance kick.
The experimental study of the Bugatti Bolide is also a very special project for Achim Anscheidt, Director of Design at Bugatti. The stylistic challenge was to transform the unyielding demands of aerodynamics and lightweight construction into an aesthetic that reflects the unique Bugatti DNA, but at the same time illustrates the ambition of an impressive weight-to-power ratio. The overall appearance is dominated by air ducts that are more reminiscent of aerodynamically sophisticated Formula 1 racing cars than classic sports cars. The seemingly filigree and half-open front end is a striking example of the combination of air duct expertise, lightweight construction requirements, and aesthetic dynamics. It is therefore not surprising that the appearance of the Bugatti Bolide invokes the so-called X-planes of aviation history and shows a clear X signature from every perspective. It is indirectly reminiscent of the Bell X-1 jet aircraft which was flown by Captain Charles “Chuck” Yeager 1947, the first person to break the sound barrier at Mach 1.06. The Bugatti Bolide “X-periment” has the shape of an aerodynamically optimised, uncompromising racing car and offers ultra-sporty, superlative performance – with no hint of luxury.
The Bugatti team developed a light monocoque made of carbon around the drive. The integral front end flanged to it is also made of high-strength carbon fibres, as are the fully aerodynamically effective underbody and the monocoque itself. The single-fibre tensile strength of the fibres used is 6,750 newtons per square millimetre, the single-fibre stiffness is 350,000 newtons per square millimetre. These represent figures that are only reached in the aerospace industry. With an overall height of only 995 millimetres, the Bugatti Bolide is exactly the same height as the historic Bugatti Type 35, depending on the steering wheel and truncated windscreen, and about 300 millimetres flatter than the Chiron. The wheelbase is 2.75 metres and the width 1.99 metres. Like in an LMP1 racing car, the occupants fold up the doors that are hinged at the front at an angle, sit on a sill that is only 70 millimetres wide, as in a Type 35, and then position their feet in the interior. Thanks to a side wall that is about 150 millimetres lower than that of the Type 35, the procedure is quick and easy – for drivers up to a body height of 2 metres. Safety is ensured with safety equipment designed in accordance with FIA regulations.
The 8.0-litre W16-cylinder engine with 1,850 PS and 1,850 newton-metres of torque is at its heart. Bugatti has designed the drive specifically for use on the racetrack and has optimised the engine and gearbox in particular for higher engine speeds. In order to achieve a dry weight of 1,240 kilograms, all the stops have been pulled out with regard to the materials and production processes used, both in terms of what is currently feasible and what will be possible in the future. All the screw and fastening elements of the Bolide are made completely out of titanium. In addition, hollow, thin-walled functional components made of an aerospace titanium alloy are used in many places. These originate from a 3D printer and are extremely thin with wall thicknesses of up to 0.5 millimetres. However, they are still very stable with a tensile strength of 1,250 newtons per square millimetre.
Instead of water-to-air intercooling, the Bugatti Bolide has air-to-air intercooling with water pre-cooling for optimal performance on the racetrack. The inflow takes place from the front via one internal and one external air duct on each side of the vehicle. The two water coolers, which are arranged in front of the front axle, provide a more effective radiator system in terms of flow than is customary even in Formula 1. Three air-cooled oil coolers for engine, transmission, and differential with water pre-cooling reduce the temperature even on dynamically demanding race laps. Newly developed and hybrid carbon titanium turbofan radial compressors ventilate and cool the high-performance racing brake system.Among other things, this includes dethrottling the intake and exhaust system to achieve an even faster, more spontaneous, and extreme response characteristic. The four newly developed turbochargers are fitted with optimised blades in order to build up more boost pressure and power at higher engine speeds. In order to achieve optimum lubrication even under extremely high centrifugal forces, the oil circuit, oil pressure, check valves, baffles, oil tanks, oil reservoirs, and pump design of the dry sump lubrication have been optimised. The weight of the drive system is also significantly reduced at the same time.
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