The new Porsche 911 Targa has been unveiled today at the 2014 Detroit motor show.

The 911 Targa features an electrically-operated two-piece roof.

Pressing a button triggers the process, whereby the glass rear window tilts to allow the soft-top section above the driver and passenger to fold away behind the rear seats.  The entire process takes 19 seconds, but can only be performed while the vehicle is stationary.

The prominent Targa bar, finished in cast aluminium, also provides roll-over protection.  The soft-top section is constructed from multiple layers, including a special sound-absorbing layer that also acts as a thermal insulator, while the rear window consists of two layers of thin safety glass with a film layer between them.  The glass also incorporates fine heating elements across much of its surface to ensure good visibility even in poor weather.

The new 911 Targa is available in two versions: the Targa 4 is powered by a 3.4-litre flat-six engine developing 350hp and, when coupled with Porsche’s excellent PDK dual-clutch transmission, can accelerate from 0-62mph in 4.8 seconds and on to its 175mph top speed.  CO emissions are between 223 – 204 g/km, depending on specification, with fuel economy between 29.7 and 32.5 mpg.

The Targa 4S features a larger 3.8-litre engine producing 400hp and can complete the same sprint in just 4.4 seconds.  Top speed is 184mph, emissions range from 237 – 214 g/km, and economy from 28.2 to 30.7 mpg.

All Targa models include leather interior, sports seats, climate control, xenon headlights, PCM satellite navigation and Porsche’s vehicle tracking system.

The Porsche 911 Targa is available to order now with prices starting from £86,281 for the Targa 4 and £96,316 for the Targa 4S.