Alfa Romeo: technologies in detail


Return of the drive architecture, four-wheel drive, eight-speed gearbox, torque vectoring system, controlled suspension: Alfa Romeo has given itself the means for its latest innovations, the Giulia and Stelvio. Steering wheel in hand, the benefits are quickly felt. But what happens among these beautiful bodies?

Traveling trains

The design of the suspension has been designed to promote handling and comfort. So Alfa Romeo has developed a new front suspension double swing and semi-virtual axis. This ensures a constant positioning of the control arm when cornering to ensure a high lateral acceleration.

Detail of the front axle

1 / upper swingarm. 2 / Lower the wings. 3 / tie rod. 4 / coaxial spring and shock absorber. 5 / aluminum strut in specific gooseneck.

The most important feature: two separate lower levers, which are arranged at different angles on the strut. This patented system performs a "scissor" motion that enhances the sense of a linear direction. Furthermore This direction is especially direct with a ratio of 12: 1.

On the back, the solution is a patented four and a half system. This makes it possible to ensure stiffness in curves while ensuring good flexibility in the longitudinal direction. The comfort is improved. In order to make the vehicle lighter, all elements are made of aluminum at the front and 45% rear.

rear train Alfa Romeo
Detail of the rear axle

To read The test of the Alfa Romeo Giulia Quadrifoglio at the Nürburgring

Q4 transmissions

The name Q4 is not new to Alfa Romeo, but its technology has not been released since the arrival of Giulia and Stelvio. The manufacturer focused on Active Torque Distribution (ATC) by default only privileged drive, Depending on the grip and driving style, however, the distribution system can transmit up to 50% of the torque to the front axle.

Differential before
Differential before

The manufacturer announces a high speed of execution, because 1,000 Nm can be sent to the front differential in less than 150 ms and can go from 1,100 Nm to 120 Nm in about 120 ms. A clutch triggers the front axle completely to gain in consumption. Another important point is the weight. The complete system weighs less than 50 kgespecially thanks to the lack of cooling system.

To read The test of the Alfa Romeo Stelvio Quadrifoglio

Active differential

The active differential of Giulia and Stelvio thanks to the function Torque Vectoringimproves motor skills and mobility. The system includes two integrated electromechanical clutches to distribute the torque independently to each of the two rear wheel axles. The advantages: increased lateral acceleration (+ 4%) and speed curve, reduction of understeer (-17%), better stability.

Braking through wire

Alfa Romeo uses a not yet released system, the brakes "by wire". The brake pedal is so decoupled from the hydraulic system, The advantages are a shortened reaction time of the system, a stabilization of the pedal feeling in the sport and an attack adapted to the driving style. The pedal is therefore more flexible in the city and firmer in aggressive driving. Finally, the number of components reduces the weight about 15 kg compared to a traditional system.

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