Torque Vectoring

What is a torque vectoring system?

The torque vectoring system, better known by the English term "Torque Vectoring", is a chassis and powertrain technology that revolutionizes a vehicle's dynamic behavior. Its role is to actively and intelligently distribute engine torque not only between the front and rear axles (in the case of all-wheel drive), but most importantly between the left and right wheels of the same axle. The primary objective is to optimize traction, improve cornering agility, and increase overall vehicle stability, whether on dry, wet, or slippery roads.

How does this technology work?

There are primarily two types of torque vectoring systems:

Mechanical/active systems: Often integrated into the rear differential, these systems use electronically controlled multi-plate clutch packs. By analyzing real-time data such as steering wheel angle, yaw rate, and acceleration, the computer can engage these clutches to accelerate the outer wheel in a turn. This action creates a yaw moment that literally helps the car "pivot" through the curve, making it sharper and reducing understeer (the tendency to plow straight ahead). This is the highest-performing solution, found on sports models like Audis with the Sport Quattro differential or BMW Ms with the Active M Differential.

Electronic systems (brake-based): More widespread and less costly, this approach uses the sensors and actuators of the Electronic Stability Program (ESP) and ABS. When understeer is detected, the system applies light braking pressure to the inside wheel of the turn. This braking effect transfers more torque to the outside wheel via the open differential, thus simulating the effect of a mechanical system. Although less sophisticated, this "brake-based torque vectoring" already significantly improves agility compared to an unequipped vehicle.

The main benefits of a torque vectoring system

The integration of a torque vectoring system offers tangible benefits for the driver:

Enhanced agility: The car enters corners with greater ease and precision. The driver needs less steering input to follow the desired trajectory, providing a connected and dynamic feel.

Improved active safety: By distributing torque to the wheels with the most grip, the system increases stability during evasive maneuvers or on roads with changing traction (rain, snow, ice).

Maximum traction: Exiting a tight corner, the system limits inner wheel slip and allows for earlier and harder re-acceleration without power loss.

Reduced wear: By optimizing traction, certain systems can contribute to more even tire wear, although this benefit is secondary.

Torque Vectoring vs. Limited-Slip Differential

It is important not to confuse a torque vectoring system with a simple limited-slip differential. A traditional limited-slip differential merely limits the speed difference between two wheels on the same axle to prevent wheelspin. A torque vectoring system is a proactive system: it can not only limit slip, but also intentionally create a torque difference to influence the vehicle's behavior and help it turn. It is a much more sophisticated evolution of the differential.

On which vehicles can it be found?

Once the exclusive domain of supercars and luxury sedans (Porsche, Audi RS, BMW M, Mercedes-AMG), torque vectoring technology is now found on a broader range of vehicles. It is available as standard or optional on many premium SUVs equipped with advanced all-wheel-drive systems (Audi Quattro, BMW xDrive, Mercedes 4MATIC) as well as high-performance hot hatches like the Volkswagen Golf R or the Renault Mégane R.S. It is a feature well worth looking for by any buyer seeking top-tier driving pleasure and safety.