FRANKFURT MOTOR SHOW: Lamborghini Aventador S Roadster revealed

Lamborghini has unveiled an even faster S version of its V12-powered Aventador Roadster ahead of its public debut next week at the Frankfurt motor show.

Before tiet to be unveiled on September 12, the Italian car maker released full pictures and technical information overnight.

The big news is that the V12 convertible benefits from the full upgrades recently introduced by the Aventador S coupe.

That means that under its rear boot lid you find a 6.5-litre V12 that churns out 30kW more than the standard car, boosting total power and torque to 544kW/690Nm.

Delivering total power at a stratospheric 8500rpm (150rpm more than the old engine) the new convertible can hit 100km/h in just three seconds dead -- a mere 0.1sec slower than the coupe.

Top speed, meanwhile, is 349km/h – exactly the same as its tin-top sibling.

Weighing in at 1625kg, the Aventador S Roadster carries a weight penalty of just 50kg over the coupe.

Beneath its skin the updated Roadster gets the faster seven-speed single-clutch automated manual transmission, new magnetic dampers and a tweaked all-wheel drive system that can send up to 90 per cent of all that torque to the rear axle to allow more oversteer than the old model.

The Aventador S Roadster comes with a completely rethought aero package that incorporates the coupe's redesigned front bumper and active rear wing that can produce 50 per cent more downforce in it most aggressive setting.

It's not yet known what premium Lamborghini will charge over the regular Aventador S but, as a guide, in some European markets the jump from coupe to roadster costs around $50,000.