Alfa chose not to delve into the engineering of the all-new chassis at the launches of both cars, but recently revealed more about their impressive underpinnings.
We've taken a look at four of the most significant technologies helping the brand reclaim its position as a maker of true drivers' cars.
1. Torque vectoring, limited-slip differentials
The transmission toolkit for the new chassis includes two rear axle differentials. There’s a conventional mechanical limited-slip version and an electronic torque vectoring unit equipped with two clutch packs to direct more torque to either rear wheel.
Vectoring more torque to the outside wheel reduces understeer by 17%, gives a 4% increase in lateral acceleration and increases agility by 20%. It can also have the opposite effect, helping to stabilise the car when the driver overcooks it. In the UK, limited-slip differentials are available in a performance pack on both models, while torque vectoring is standard on the 503bhp Q2 two-wheel-drive-only Giulia Quadrifoglio and Q4 all-wheel-drive Stelvio Quadrifoglio.
Continental AG’s MKC1 brake-by-wire system makes its world debut in Alfa’s all-new Intelligent Braking System (IBS). Brembo brake calipers are still hydraulically operated rather than electro-mechanical but what’s changed is the front end. Instead of acting directly on a hydraulic master cylinder as usual, pressure on the brake pedal is transformed into hydraulic pressure by an electronic control module (ECU). One braking unit weighing 6kg replaces four weighing 10kg on a conventional system and takes up less space.
The driver gets a brake pedal feel that remains consistent and firm, however hot the brakes may get (so no spongy pedal on track). Standard calipers are aluminium four-piston on the front and cast-iron single piston on the rear. “The Quadrifoglio is designed to drive from home to work during the week and to go on track at the weekends,” says test co-ordinator Federico Langarelli Sellani, so rear calipers are also aluminium four-piston on those models. An optional four-wheel carboceramic (CCM) disc brake with sixpiston front calipers gives a generous weight saving of 5kg per wheel and colossal, inexhaustible braking performance.