GM was recently caught driving the Porsche 911 GT2 RS, once again demonstrating The General’s continued interest in using the German supercar as a benchmark for its own performance vehicles.
This isn’t the first time we’ve brought you coverage of GM’s benchmark testing for the Porsche 911 GT2 RS. Back in May of 2021, GM Authority published photos of the Porsche 911 GT2 RS prowling the North-South straight at the GM Milford Proving Ground in Michigan shortly after a prototype Corvette C8 Z06 performed a few similar runs. GM’s benchmarking for this particular Porsche 911 GT2 RS even dates back to January of 2020, at which time the German supercar was seen on public roads in California alongside an early prototype of the Chevy Corvette C8 Z06.
Now, GM is back at it, once again benchmarking the Porsche 911 GT2 RS at the Milford Proving Grounds, as seen in these photos of the sports car on the roads around the facility. The car seen here was not part of the test group, although that was the case when we’ve seen it in the past.
For those readers who may not know, the Porsche 911 GT2 RS offers some rather heavy-hitting performance specs, including a rear-mounted, twin-turbo 3.8L flat-six gasoline engine rated at 700 horsepower at 7,000 rpm and 553 pound-feet of torque at 4,500 rpm. Output is routed to the rear axle by way of a seven-speed dual-clutch automatic transmission, propelling the GT2 RS to 60 mph in roughly 2.7 seconds. Top speed is set at 211 mph.
By comparison, the Chevy Corvette C8 Z06 is equipped with the mid-mounted, naturally aspirated 5.5L V8 LT6 gasoline engine, which is rated at 670 horsepower and 470 pound-feet of torque. Further highlights for the LT6 include 32 valves and a flat-plane crankshaft, plus an 8,600-rpm redline. Output reaches the rear wheels through the eight-speed dual-clutch automatic transmission co-developed with Tremec. Properly motivated, the Chevy Corvette C8 Z06 can sprint to 60 mph in around 2.6 seconds, all while making a decidedly exotic-sounding howl.