The Stuttgart-based source, with direct links to Porsche Motorsport, contends plans are for the GT3 to adopt a heavily reworked version of the existing 911 Turbo’s twin-turbocharged, 3.8-litre horizontally opposed six-cylinder engine.
In the new 911 Turbo, due to be revealed during the latter half of next year, the revised engine is expected to kick out 572bhp, giving it the same output as the outgoing 911 Turbo S. However, suggestions are it could be tuned to deliver somewhere in the region of 513bhp for the new 911 GT3.
With the naturally-aspirated 4.0-litre flat six engine used by today’s 911 GT3 rated at 493bhp, the twin-turbocharged engine would undoubtedly have to the potential to not only lift the power output of its successor but also bring a wholesale increase in torque.
In today’s 911 Turbo, the twin-charged 3.8-litre unit delivers 524lb ft between 2200 and 4000rpm compared to the 339lb ft between 6000 and 9000rpm for the naturally aspirated 4.0-litre in the current 911 GT3.
As well as considering big changes to the 911 GT3, Porsche boss Oliver Blume has reportedly also provided a definitive greenlight to a new hybrid-powered 911 model within the new 992 series.
Details remain scarce, though the new petrol-electric powered 911 is expected to feature the upcoming Carrera’s turbocharged 3.0-litre horizontally opposed six-cylinder engine in combination with a 94bhp electric motor for a combined output of around 478bhp. Energy for the electric motor is rumoured to come from a 11kWh lithium-ion battery.