Lamborghini reveal open-top Aventador J at Geneva

Lamborghini has made the biggest impact at the 2012 Geneva Motor Show so far after it unveiled the Aventador J: a 515kW lightweight version of the regular Aventador LP700-4.

The Aventador J looks to be going for the track day sport-bike car style, ala the KTM X-Bow, as it does away with comforts like sat nav and climate control to reduce weight - not to mention the roof and windshield which have been replaced by two small wind deflectors. Lamborghini have also made use of a new carbon fibre technology called ‘Carbonskin’ which makes up the cockpit trim and seats.

The Aventador J retains the V12 engine and AWD system from the regular Aventador, allowing it to travel capably at speeds of over 300km/h even without a roof. Helmet and leathers are advisable though.

Only a single Aventador J has been built, and Lamborghini say that one lucky (and cashed up) punter will be driving it home from Geneva.

We're giving away the last great Aussie Holden V8! Enter here for your chance to win!

Sign up here to receive the latest round-up of Wheels news, reviews and video highlights straight to your inbox each week.