Lamborghini presented Revuelto, its super sports V12 hybrid plug-in HPEV (High Performance Electrified Vehicle). (Earlier post.) An output of 1015 CV is delivered from the combined power of an entirely new combustion engine together with three electric motors, alongside a double-clutch gearbox that makes its debut on a 12-cylinder Lamborghini for the first time.
The new 127 CV/liter combustion engine works synergically with two front axial flux motors that deliver an outstanding weight-to-power ratio, with a radial flux electric motor positioned above the first eight-speed double-clutch gearbox debuting on a 12-cylinder Lamborghini. The three electric motors are powered by a lithium-ion high specific power (4500 W/kg) battery pack that also supports a fully-electric drive mode.
Carbon fiber, produced via artisan craftmanship in the Sant’Agata Bolognese factory, is the principal structural element within the new car, used not only in the monofuselage and frame but also for many elements of the bodywork. The extensive use of carbon fiber and lightweight materials, combined with the potent engine power, contributes to achieving the best weight-to-power ratio in the history of Lamborghini: 1.75 kg/CV.
The new Revuelto combines these attributes to deliver performance figures at the peak of its segment: acceleration from 0-100 km/h in only 2.5 seconds and a top speed of more than 350 km/h (217.5 mph). These numbers combine with its exceptional dynamism due to the introduction of electric torque vectoring, and four-wheel drive available also in fully-electric drive mode, ensuring the Revuelto super sports car expresses its amplified qualities both on track and in daily driving.
The Revuelto is based on a new aeronautics-inspired chassis, the monofuselage. As well as a monocoque made entirely of multi-technology carbon fiber, it features a front structure in Forged Composites; a special material made of short carbon fibers soaked in resin. This technology was developed and used by Lamborghini in its first structural applications as far back as 2008.
The monofuselage represents a significant step forward from the Aventador in terms of torsional stiffness, lightweight qualities and driving dynamics. The Revuelto is the first super sports car to be fitted with a 100% carbon fiber front structure. Carbon fiber is also used for the front cone structures to ensure a level of energy absorption that is significantly higher when compared to a traditional metal structure— double that of the Aventador’s aluminum front frame—combined with a substantial reduction in weight.
The Revuelto monofuselage is 10% lighter than the Aventador chassis, and the front frame is 20% lighter than its aluminum predecessor. The torsional stiffness has also been improved with a value of 40,000 N·m/°, up +25% compared to the Aventador and guaranteeing best-in-class dynamic capabilities.
The design concept underlying the development of the new monofuselage is based on the maximum integration between components. This is optimized thanks to the introduction of extensive Forged Composites technology, as well as the development of the monolithic rocker ring. This use of carbon fiber makes the Revuelto unique in the super sports car arena: the single- element ring-shaped component is made of CFRP (Carbon Fiber Reinforced Plastic) and forms the supporting structure of the car. The rocker ring encloses and connects the Forged Composite elements such as the tub, the front firewall and A pillar.
The more traditional, but no less efficient, technology of autoclave composite production with pre-impregnated material was retained for the roof construction. The autoclaved carbon fiber meets high technical, aesthetic and quality requirements, complemented by craftsmanship in the highly specialized hand lay-up process, which results from years of quality-driven in-house production of composite material components. It is a manufacturing decision that also gives the customer maximum versatility in roof customization.
The rear chassis is made of high-strength aluminum alloys and features two important hollow castings in the rear dome area: these integrate the rear suspension’s shock towers and powertrain suspension into a single component with closed inertia profile, guaranteeing a significant reduction in weight, an increase in rigidity and a substantial reduction in welding lines.
Powertrain and layout. The naturally-aspirated 6.5-liter V12 mid-mounted engine is complemented by three electric motors, one of which is integrated into the new double-clutch eight-speed gearbox. This is mounted transversely and placed for the first time behind the combustion engine. In what has been the transmission tunnel since the days of the Countach, there is a lithium-ion battery instead, which powers the electric motors.
The electric motors boost power delivery at low revs and can also turn the new Revuelto into a purely electric car, reducing overall CO2 emissions by 30% compared to the Aventador Ultimae.
A unique architecture. Lamborghini has been synonymous with V12 engines since the company was founded. The very first Lamborghini model to sport this characteristic engine was the iconic 350GT launched in 1963. The first time that an electric motor was matched to a 12-cylinder internal combustion engine in a Lamborghini was in 2019 with the Sián, which used a 25 kW electric engine to support the previous generation of V12, storing the electrical energy in a supercapacitor.
The Revuelto introduces a hybrid architecture and a new generation of V12. The car is launched as the first High Performance Electrified Vehicle - HPEV: a plug-in hybrid super sports car equipped with a lightweight high-power lithium ion battery, housed within the transmission tunnel in the central section of the chassis.
The new L545 engine has a capacity of 6.5 liters and is the lightest and most powerful 12-cylinder engine ever made by Lamborghini. In total it weighs just 218 kilograms: 17 kilograms less than the Aventador unit.
The Revuelto features the engine rotated through 180 degrees compared to the Aventador layout. The superquadro V12 puts out 825 CV at 9250 revs per minute thanks to the redesigned distribution system that supports a maximum rev range of 9500 rpm. Specific power is 127 CV per liter, the highest output in the history of Lamborghini’s 12-cylinder engines, while maximum torque is 725 N·m at 6750 rpm.
The air intake ducts to the cylinders have been re-engineered to increase the supply of air and guarantee optimal airflow in the combustion chamber. The combustion within the actual engine has also been optimized, due to the regulation of ionization in the chamber with two control units: a solution already used in the Aventador and now transferred to the new model.
The new combustion system is also characterized by an increased compression ratio (12.6:1 compared to 11.8:1 for the Aventador Ultimae). The fluid dynamics of the exhaust have also been improved to reduce counter-pressure at high revs and increase the specific power output.
Electric four-wheel drive. The Revuelto retains one of Lamborghini’s strongest traditions: four-wheel drive. As well as the internal combustion engine that provides power to the rear wheels, a pair of electric motors now make their debut on the front axle, each supplying traction to one of the front wheels. There’s also a third electric motor positioned above the eight-speed double-clutch gearbox that can supply power to the rear wheels, depending on the selected driving mode and the conditions.
The combined torque from the combustion engine and three electric motors offers performance levels that are unique even within the domain of super sports cars, with 725 N·m produced by the internal combustion engine and 350 N·m from each of the front electric motors. In total, the power unit delivers a combined maximum output of 1015 CV.
The two electric motors at the front are oil-cooled axial flux units and offer an exceptional weight-to-power ratio: 18.5 kilograms from each of the 110 kW units. As well as providing power to the front wheels, they also have a torque vectoring function, optimizing driving dynamics, and recuperating the energy produced under braking. When in electric mode, the Revuelto is front-wheel drive only to optimize energy consumption, while electric drive to the rear axle is activated on demand when needed.
The Lamborghini Revuelto is equipped with a lithium-ion high specific power (4500 W/kg) battery pack situated within the central tunnel, keeping the center of gravity as low as possible and ensuring optimal weight distribution. The battery is protected by a lower structural layer and is connected to the front electric motors, the rear electric motor, and an integrated recharging unit.
The battery is 1550mm long, 301mm high, and 240mm wide, containing pouch cells with an overall capacity of 3.8 kWh. When the charge drops down to zero it can be recharged using both ordinary domestic alternating and charging column current up to 7 kW in power, and completely recharges in just 30 minutes. It can also be recharged under regenerative braking from the front wheels or directly from the V12 engine in just six minutes.
Gearbox. The new eight-speed gearbox is positioned transversally behind the longitudinal V12 engine, to leave space in the tunnel for the lithium-ion battery that feeds the electric motors. In the 60-year history of Lamborghini, only two other V12 cars have been equipped with a transverse rear gearbox: the revolutionary Miura launched in 1966, which also adopted a mid-rear transverse engine layout; and the Essenza SCV12, a track-focused hypercar with a longitudinal engine and load-bearing transverse gearbox.
The internal structure of the new gearbox has two distinct shafts as opposed to the usual three. One manages the even-numbered gears, the other manages the odd numbers. Both engage the same rotor. This layout helps to keep down the overall weight while also saving space.
The development of an eight-speed Double Clutch Transmission (DCT) comes from the desire to create a unit that provides everything needed for sporty driving such as fast gear shifts, while the inclusion of an eighth ratio helps optimize fuel consumption and drivability while cruising.
A particular feature is the ‘continuous downshifting’, which drops down multiple gears under braking simply by holding down the left paddle, giving the driver the feeling of total control.
Leaving aside the electrical components, the new DCT gearbox is lighter and faster in terms of shifting speed compared to the seven-speed double clutch unit that is used in the Huracán range. The transverse layout has also allowed for a more spacious cabin interior, creating more room behind the driver and passenger to improve comfort.
The double-clutch gearbox is extremely compact; just 560mm long, 750mm wide and 580mm high. Total weight is just 193 kg, which includes a new component fundamental to the car’s hybrid architecture: the rear electric motor, with maximum power of 110kW and peak torque of 150 N·m.
Located above the gearbox, this electric motor doubles as the starter motor and generator, as well as supplying energy to the front electric motors via the battery in the transmission tunnel. In full electric mode it can also provide power to the rear wheels that, in addition to the e-motors driving the front wheels, allows electric four-wheel drive. How the system functions depends on which driving mode is engaged, thanks to an uncoupling mechanism with a dedicated synchronizer allowing the connection to the double-clutch gearbox. When it is providing additional power to the V12 internal combustion engine, the electric motor is in P3 position, separated from the gearbox, while it moves into the P2 position to recharge the battery at low speeds and when parked, also serving a starter motor.
In the P3 position, the Revuelto can become an electric four-wheel drive car, depending on the drive mode selected, continuing Lamborghini’s four-wheel drive tradition even in electric mode.
Reverse gear is provided by the two front electric motors, although if extra momentum is needed the rear electric motor can also kick in, which activates the rear axle and wheels. As a result, the Revuelto can drive all four wheels in electric mode even when reversing in low grip conditions.
Electric torque vectoring. With the e-axle, with the Revuelto Lamborghini introduces electric torque vectoring for the first time in its history and inaugurates the Lamborghini Dinamica Veicolo 2.0 system. Electric torque vectoring increases the car’s agility in narrow cornering as well as its stability in high-speed cornering, distributing torque optimally to each wheel and working in synergy with the four-wheel steering system.
In addition, unlike conventional systems, the new torque vectoring intervenes on the brakes only when strictly necessary, to maximize efficiency and ensure a more natural driving style as well as an even higher level of performance. When braking, the e-axle and rear electric motor contribute to deceleration, reducing stress on the brakes while recharging the battery.