Both are the range-topping Quadrifoglio versions, which makes this fight even more exciting to watch.
Alfa Romeo is back with a bang, and the inclusion of the Stelvio and Giulia into the lineup is helping push the brand to even greater success. The Quadrifoglio models are the performance stars of the range. Even if these trims don't generate huge sales volume, they maintain excitement in the company and continue its legacy of building speedy vehicles. Motor1.com's team in Italy were lucky enough to put this range-topping sedan and SUV to the test along a quarter mile (400 meters) of airport runway in central Italy.
The Quadrifoglio versions of the Stelvio and Giulia both use a 2.9-liter biturbo V6 that produces 505 horsepower (377 kilowatts) and 443 pound-feet of torque, and they use an eight-speed automatic gearbox. The major difference is how the output reaches the road. The Giulia sedan routes all of its power to the rear wheels, but the Stelvio has all-wheel drive.
Gallery: 2018 Alfa Romeo Stelvio Quadrifoglio: First Drive
The Giulia has its own advantage, though, because the sedan weighs about 331 pounds (150 kilograms) less than the Stelvio.
Our Italian colleagues had fun by doing several test runs before running the actual race. It was a chilly day with temperatures hovering around 32 degrees Fahrenheit (0 degrees Celsius). A humid night had left the runway slightly damp, too. They eventually figured out that the conditions actually made the vehicles slower when using launch control. The run came down to the drivers managing things off the line with their right foot and the feel of the road.
The video is in Italian, but you don't need to speak the language to understand what's going on when the Quadrifoglios race down the runway. Check out the video to see whether the lighter sedan can beat the better traction of its sibling.