The Alfa Romeo Giulia Quadrifoglio produces an incredible 505 horsepower from it’s twin-turbocharged 2.9-liter V6 engine. That’s what Alfa Romeo claims, anyway, but how truthful is the Italian automaker being?
To find out the Giulia Quadrifoglio’s true power output at the wheels, YouTube user and Giulia Quadrifoglio owner AutoAvanti took her car to a local auto shop to have it dyno tested.
The shop in question uses a Mustang-brand dynamometer, which offers up more conservative power estimates than the Dynojet-branded unit that is more frequently used. On the Mustang dyno, the Giulia Quadrifoglio put down 392 horsepower at the wheels, which is roughly equivalent to 460 horsepower at the flywheel.
We’re confident the Giulia Quadrifogllio is producing more power than the figure estimated by the Mustang dyno and it has the acceleration and top speed figures to back it up, but be sure check out the dyno pull in the video above anyway. If anything, it’s just interesting to watch the vehicle’s active front splitter deploy while the vehicle is stationary.