The Alfa Romeo Giulia Quadrifoglio comes with a design that provokes your senses. The use of ultralight, high-strength materials, class-exclusive technologies and supercar power and handling convert it into priceless driving dynamics.

Alfa Romeo Giulia Quadrifoglio is equipped with a 2.9-liter twin-turbo V-6 engine with 505 horsepower and an 8-speed automatic transmission. The car has a max torque of 443 lb-ft. The front mounted engine and the all-aluminum suspension create a near perfect 50/50 weight distribution with optimal balance. The car has four selectable drive modes that adjust suspension damping and throttle response. These stats make Giulia Quadrifoglio the fastest four-door production vehicle. It had a lap time of 7:30 on the demanding Nurburgring track.

According to The Drive, the Youtube user Auto Avanti has posted a video that shows the 2017 Alfa Romeo Giulia Quadrifoglio being tested on a dynamometer. Even though the Italian automaker claims that Alfa Romeo Giulia Quadrifoglio has 505 horsepower, the dynamometer test resulted says otherwise. According to the power reading, it has 392 horsepower. That is 113 horsepower lower from what Alfa rates the 2.9-liter engine. However, there is always drivetrain loss.

The amount is dictated by the type of dynamometer being used, and the number of driving wheels on the car being tested. A normal drivetrain loss on a two-wheel drive car is around 20% of the reported factory power output. In this example, 20% of 505 horsepower is 101 horsepower. That is well within the range of normal drivetrain loss.

Jalopnik also reported that dynamometers are known for giving conservative ratings. It is safe to assume that there may be a little more power available than what was shown on the video. For comparison, Matt Farah tested his pre-tuned Focus RS on a similar Mustang dynamometer. The results showed an eight percent difference in horsepower, and no difference in torque from Ford’s claimed specs.

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