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Dyno tests suggest C8 Corvette is extremely underrated

The dyno test may have been erroneous, unless GM is sending journalists cars that are not production-spec.

Dyno tests of the 2020 Chevrolet Corvette have pointed to much higher horsepower than the official specs, raising questions over General Motors' fleet of press cars.

Motor Trend took their loaner 'Vette to a dyno and was 'shocked' to find that the car produced 558 horsepower and 515 pound-feet of torque at the wheels. Extrapolating the numbers to account for drivetrain losses of an estimated 15 percent points to at-the-engine figures of 656 horsepower and 606 pound-feet of torque.
The mid-engine Corvette is officially advertised as having just 495 horses and 470 pound-feet of torque. Motor Trend says it "couldn't come up with a conclusion other than the engine makes a lot more power than ... advertised."
GM engineers responded by providing theories for the discrepancy, noting that performance increases when the engine was cold and the company follows SAE certification standards that slowly increase engine RPM and naturally lead to more heat generation during each individual test. Motor Trend evaluated the Ram 2500 on the same dyno and found that its at-the-crank estimates were much closer to the official specs, however, leaving some lingering doubt over GM's explanations.
The report did not dwell on the possibility that the dyno test may have been erroneous and did not directly mention the possibility that GM's Corvette press cars are tuned to deliver more power than the final production-spec vehicle, though the outlet did promise to test retail cars as they become available.

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