Lamborghini has taken the cover off its latest bedroom wall poster creation, the Fenomeno Roadster. Based on the Fenomeno coupe revealed last year but featuring an extensive redesign to turn it topless, it’s understood just 15 units of the Fenomeno Roadster will be built and one of those is destined for Australia.

Using a 794kW 6.5-litre V12 plug-in hybrid drivetrain, the Fenomeno will hit a top speed of over 340km/h and its price tag is reportedly in excess of a cool $8 million.

Featuring the same carbon fibre monocoque chassis as the Fenomeno coupe, the roadster’s induction system and engine cover had to be redesigned for better cooling to the engine. Likely because of that, it actually has no roof at all, not even an emergency cloth top. A longer windscreen rail to channel air to the engine and a new pair of roll-over hoops also differ from the coupe.

According to Lamborghini, those changes have boosted the Fenomeno Roadster’s downforce by 30 per cent without sacrificing any cooling performance.

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Like the Fenomeno coupe, the Roadster is based on the Revuelto hypercar and features the same 6.5-litre V12 hybrid plug-in drivetrain with three electric motors making huge 794kW and 1075Nm outputs. An eight-speed dual-clutch transmission is standard sending grunt to all four wheels, and the 0-100km/h dash is completed in just 2.4 seconds and 0-200km/h in just 6.8 seconds.

Yet, thanks to a 7.4kWh battery, the Fenomeno Roadster can cover up to 20km on electric power.

Keeping the Fenomeno Roadster’s weight as low as possible was the aim for the engineers, and at a reasonable 1780kg, it only weighs 8kg more than a Revuelto. Part of its weight economy is accounted for by the extensive use of carbon fibre, including a new carbon fibre wheel design that saves 3kg at each corner and the brand’s new ‘CCM-R’ carbon-ceramic brakes.

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Under the body are a set of manually-adjustable dampers, which allow the suspension to be tailored to each driver’s taste. While the braking and steering is carried over from the coupe, Bridgestone has developed a bespoke set of tyres specifically for the roofless car’s 21 and 22-inch staggered wheel sizes.

The interior of the Fenomeno Roadster is largely identical to the coupe, though the brand says that a further range of interior colour options will be available. Each Fenomeno Roadster will be specified to its owner’s requirements, and a naked carbon body is reportedly on the options list.

The first Lamborghini Fenomeno Roadsters will start deliveries in Europe later this year.