Top speed varies according to the amount of downforce dialled into the rear wing, although Porsche officials suggest it will crack 200mph in low-downforce guise.
Details of the extent of the changes made to the 4.0-litre engine used by 911 GT3 RS remain under wraps, although its 493bhp and 384lb ft are 25bhp and 60lb ft more than that produced by the 3.8-litre powerplant found in its standard sibling, making it the most powerful naturally aspirated engine yet to be fitted to a road-going version of the iconic 911.
Drive is sent to the rear wheels through a reworked seven-speed dual-clutch automatic gearbox and fully variable locking differential with an integrated torque vectoring function.
Porsche claims the new 911 GT3 RS is capable of lapping the Nürburgring in just 7min 20sec.
In the meantime, Porsche is also working on a brand-new supercar to compete with the likes of the Ferrari 488 GTB and McLaren 675LT. Wolfgang Hatz, head of research and development at Porsche, has said it will be ready by the end of the decade “at the latest”.
Details are patchy, but the car is believed to feature the brand-new V8 motor already in development for the new Panamera, its 928-replacing two-door variant and the next Cayenne.
Mounted amidships behind the driver, the engine is likely to follow current thinking and derive its power as much from turbocharging as from its displacement.
It is not yet known whether the car will feature any degree of hybridisation. However, it is clear that this is not a replacement for the 918 Spyder hypercar but a standard, production model. Hatz has, however, also confirmed that a new 918 will eventually be built.
Porsche's two-door sports car future
New 500bhp GT3 RS will be unveiled in March and followed this autumn by the second-generation ‘991’ 911, featuring a new range of turbocharged engines based on the new motor designed for the RS. A flat-six configuration will be retained without hybridisation, which Porsche feels to be more useful in cars like the Cayenne and Panamera.
Hatz has also confirmed that despite comments made by at least one of his predecessors, the new turbocharged flat-four engine Porsche has been known to be working on for some years will not find its way into the back of a 911. "A 911 has a flat-six engine," said Hatz, and left it at that.
Instead, the new flat-four will first appear in the Boxster early next year and should also feature in the Cayman.
New £64,451, 380bhp flagship Cayman GT4 will be joined at the other end of the range by a new four-cylinder entry-level model. The new engine, which is two-thirds of the new flat six, should displace around 2.0 litres but will be turbocharged to provide “proper Porsche performance”.
This will also receive the new four-cylinder engine. Moreover, there will be a new variant that’s likely to be the most sporting model in the current range. Tipped as a replacement for the popular Spyder of 2011, the car - possibly bearing the Club Sport name but not GT4 - is expected to have a little more power and a lot less weight.