The 691bhp 3.8-litre flat six in the GT2 RS is a development of the current 911 Turbo engine, which itself first appeared in a mid-life refreshed version of the 997-generation 911 in 2009.
However, Porsche’s engineers have produced 40% more power from the unit for this car than they conjured from the same engine block and cubic capacity almost a decade ago. The new GT2 RS also improves on the headline power output of its immediate predecessor (which used Porsche’s older 3.6-litre turbo engine) by a pretty healthy 80bhp.
The engine uses bigger turbochargers than the 911 Turbo’s, new pistons for a lower compression ratio, and new charge air intercoolers that are cooled by a water spray system fed from a five-litre tank located in the bottom of the car’s luggage compartment and allow the engine to maintain its peak outputs even at high temperatures and under demanding load conditions.
That it has a 7200rpm redline, Porsche claims, makes it exceptionally free-revving among similar turbocharged performance engines, although the fact that Ferrari’s turbo V8 488 Pista engine will spin to 8000rpm, and McLaren’s 720S turbo V8 faster still, rather gives the lie to that claim. Both key rivals are also lighter, more powerful and have more torque than the Porsche.