Two days ago, YouTube user AutoAvanti posted a video showing her 2017 Alfa Romeo Giulia Quadrifoglio making a few pulls on a dynamometer to show us, the public, what kind of power actually lurks from within. Fresh from the factory, the Giulia Quadrifoglios 2.9 liter twin-turbocharged V6 generates 505 hpall of which is sent to the rear wheelsaccording to the Italian automaker.
The best pull on the dyno resulted in a power reading of 392 hp, which is down 113 hp from what Alfa rates the 2.9 liter engine (ostensibly at the crank). With any reading from a dyno, however, theres always an inherent drivetrain loss, the amount of which is dictated by the type of dyno being used and the number of driving wheels on the car being tested.
A normal drivetrain loss on a two-wheel drive car, like the Giulia that was tested, normally works out to subtract around 20% of the purported factory power output. In this instance, 20% of 505 hp is 101 hp, which is well within the range of normal drivetrain loss. Adding to those missing ponies is the Mustang Dyno which was used, a dynomometer thats notorious for being conservative with its numbers.
One things for certain, thoughfor better or worse, FCA isnt underrating this power plant, something that some German manufacturers have been doing years.