Positioned above the Aventador, the Sián is likewise powered by a mid-mounted V-12 engine. Here it features new componentry including titanium exhaust valves to produce 785 hp. However, most significant is the addition of a hybrid assist system unlike any other. Instead of using heavy batteries to increase power, Lamborghini developed a supercapacitor which can rapidly discharge and recharge during dynamic driving situations.

The supercapacitor drives a 48-volt motor incorporated into the transmission to add 34 horsepower. It provides boost during shifts, in low-speed parking maneuvers, and acceleration up to 80 mph, at which point the V-12 takes over fully. The result should be instant torque off the line, as well as consistent power delivery between Lamborghini's notoriously brutal gear changes. Engineers claim the Sián's energy storage system is fully charged every time the vehicle brakes, always primed for the next power deployment. Altogether, this drivetrain produces 819 hp, making the Sián Lamborghini's most powerful car ever.

Lamborghini Sian Front Three Quarters View Static

With low weight a goal of the Sián project, the supercapacitor is far lighter than other hybrid solutions, adding only 75 pounds to the vehicle. Extensive use of carbon fiber and other lightweight materials mean the Sián has a power-to-weight ratio better than the Aventador SVJ. Thanks to this, the Sián also earns the title of quickest-accelerating Lamborghini ever, rocketing from 0-60 mph in less than 2.8 seconds. Given that we measured the SVJ's 0-60 acceleration at 2.5 seconds, this estimate is likely conservative.

While it appears the Sián is based around the Aventador's carbon-fiber monocoque chassis, its completely new bodywork increases angularity and is unmistakably Lamborghini. Numerous cues from the Terzo Millennio concept are present, namely the three-pointed LED headlights which capture attention at the front. Those flow into drag-reducing vents above the wheels toward enlarged side air intakes. Canards protrude from each rear corner, between which a massive active spoiler is mounted. Behind, six taillight lenses serve as a tie-in to the legendary Miura, while two gigantic exhaust ports are integrated into an aggressive diffuser. Admirers can peer at the engine through a glass cover, which seamlessly tapers into the sunroof. Never one to shy away from striking design, Lamborghini says to expect similar visual traits in its future models.

Lamborghini Sian Rear Three Quarters Garage

In a nod to its founding year of 1963, Lamborghini will produce only 63 examples of the Sián for its most dedicated clients. Each will be styled completely individually though its Ad Personam program, meaning every one will be unique—although none will be subtle. Those now interested in acquiring a Sián are too late: All were pre-sold prior to the car's unveiling.

In a world where hybridization is now critical to unlocking new levels of performance, Lamborghini embraces electricity's potential with a clever, novel approach. It will be exciting to see how supercapacitor technology, and the Sián's design traits, proliferate across Lamborghini's lineup in the coming years.

We'll get our first in-person look at the Sián at the Frankfurt Motor Show later this month. Until then check out Automobile's list of the 15 most powerful naturally aspirated cars.

Source: Lamborghini