Jackson Reid
The Golf R is a powerful all-wheel-drive (AWD) car manufactured by Volkswagen. The Golf R's AWD system has undergone several changes since its introduction in 2002, with the latest models featuring a torque-vectoring rear differential that can send 100% of the engine's torque to an individual wheel. This system is a significant upgrade from the previous Haldex AWD system, which could only send up to 50% of the engine's torque to the rear wheels. The Haldex system used an electro-hydraulic clutch to send power to the rear wheels when necessary, such as when the front wheels were slipping. The Golf R's AWD system provides improved handling, grip in wet conditions, and great launching power. While it is primarily front-wheel drive, the rear axle can be engaged within fractions of a second when needed, making it a versatile and efficient vehicle.
| Characteristics | Values |
|---|---|
| Type of AWD system | Haldex system (Gen IV, Gen V, Haldex Coupling), Magna torque vectoring |
| Power transfer | Up to 50% of power can be transferred to the rear wheels |
| Fuel efficiency | Better fuel mileage than Subaru AWD system |
| Activation | Activated by an electro-hydraulic oil pump |
| Driving status identification system | Evaluates wheel speeds and steering angle |
| ESC button | Pressing for longer than 3 seconds deactivates the system for professional driving |
| Gearbox | 6-speed gearbox, 7-speed dual-clutch transmission |
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What You'll Learn
The Haldex system
The Haldex Coupling uses an electronically-controlled hydraulically-actuated clutch to sense front-wheel slip and send torque to the rear wheels. The Haldex system is typically FWD-biased, sending most of the torque through the front wheels and allowing the car to save fuel. However, the rear axle can be variably engaged in fractions of a second whenever necessary via the Haldex coupling, which is activated by an electro-hydraulic oil pump.
The Haldex 5 coupling, used in the Golf R, is activated based on the engine torque demanded by the driver. In parallel, a driving status identification system within the all-wheel-drive control unit evaluates parameters such as wheel speeds and steering angle. If necessary, nearly 100% of the drive torque can be directed to the rear axle.
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Torque vectoring technology
The Golf R's all-wheel-drive (AWD) system has evolved over the years, with the latest iteration featuring torque vectoring technology that significantly improves handling. This technology allows for a greater amount of torque to be sent to the rear wheels and, importantly, enables torque distribution side-to-side.
The previous generations of the Golf R utilised the Haldex AWD system, which could redirect up to 50% of the engine's torque to the rear wheels when needed. This system employed an electro-hydraulic clutch to engage the rear wheels when the front wheels lost traction. While effective, this clutch-type coupling system generated significant heat and wear under heavy load or prolonged operation.
The new torque vectoring technology in the Mk8 Golf R, also known as the Magna torque vectoring system, represents a significant advancement. It allows for more precise torque distribution, sending up to 100% of the engine's torque to an individual wheel via a multiplate clutch. This capability enhances the vehicle's handling and stability, particularly during cornering and in low-traction conditions.
The Mk8 Golf R's torque vectoring system is electronically operated, utilising ECU and sensor technology advancements. It incorporates features such as electronic throttle bodies, Electronic Stability Control (ESC), yaw sensors, and modern ABS systems. These enhancements enable the system to proactively sense slip and make adjustments to power distribution accordingly.
The Golf R's torque vectoring technology provides a more dynamic and responsive driving experience, ensuring optimal torque distribution to each wheel as needed. This technology not only improves handling but also contributes to better fuel efficiency, making it a well-rounded and efficient AWD system.
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Front-wheel drive
The Volkswagen Golf R is an all-wheel-drive (AWD) vehicle, but its system is biased towards front-wheel drive (FWD). Under normal driving conditions, more than 95% of the engine output is routed to the front wheels, with the rear wheels receiving less than 5% of power. This means that, in practice, the Golf R operates much like a FWD car, with its AWD feature kicking in only when required.
The Golf R's AWD system uses the 5-generation Haldex setup, which employs an electro-hydraulic clutch to send power to the rear wheels. This type of clutch coupling system generates a lot of heat and wear under heavy load or long periods of operation. As a result, the rear wheels only receive meaningful power when the Haldex ECU deems it necessary, such as when the front wheels are slipping.
The Haldex coupling, a product of Swedish company Haldex Traction, was introduced in some 1998 Volkswagen and Audi models. It differs from earlier VW Syncro and Audi Quattro AWD setups, which relied on a mechanical connection using Torsen differentials. In contrast, the Haldex coupling uses an electronically-controlled, hydraulically-actuated clutch to detect front-wheel slip and send torque to the rear wheels.
The Haldex system in the Golf R is further enhanced by features such as the Haldex 5 coupling, which is activated even before any wheel slip occurs, eliminating nearly all traction losses. This is achieved through an advanced control function that considers specific driving conditions. When operating under low load or coasting, forward propulsion primarily comes from the front axle, with the rear axle decoupled.
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Rear-wheel drive
The rear-wheel drive in the Golf R is facilitated by the Haldex coupling system, which uses an electro-hydraulic clutch to transfer power to the rear wheels. This system is designed to engage only when necessary, such as when the front wheels are slipping, to prevent heat and wear on the clutch. As a result, under normal driving conditions, more than 95% of the engine output is directed to the front wheels, with the rear wheels receiving less than 5% of the power.
The Haldex coupling system in the Golf R is an evolution of the technology introduced in 1998 by Swedish company Haldex Traction. The system differs from earlier VW Syncro and Audi Quattro AWD setups, which relied on mechanical connections using Torsen differentials. In contrast, the Haldex coupling system employs an electronically-controlled, hydraulically-actuated clutch to detect front-wheel slip and redirect torque to the rear wheels.
While the Haldex system in the Golf R prioritises torque distribution to the front wheels during typical driving conditions, it is capable of transferring up to 50% of the power to the rear wheels when necessary. This dynamic torque distribution is managed by a control unit that calculates the ideal drive torque for the rear axle and adjusts the clutch engagement accordingly.
In the 2022 Golf R, Volkswagen introduced a torque-vectoring rear differential that further enhances the AWD system. This technology enables the vehicle to direct 100% of the engine's torque to an individual wheel, providing improved handling and stability. The Golf R's AWD system has been praised for its performance and efficiency, offering a balance between powerful acceleration and fuel efficiency.
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Braking and ABS
The Golf R's AWD system uses the 5th generation Haldex system, which uses an electro-hydraulic clutch to send power to the rear wheels. This system is designed to activate only when necessary, such as when the front wheels are slipping. Under normal driving conditions, more than 95% of the engine output is routed to the front wheels, with the rear wheels receiving less than 5% of power.
The Haldex system works in conjunction with the XDS (Electronic Differential) system, which uses the brakes to control wheel spin at each wheel, reducing the torque applied to the ground by one or more wheels to near-zero. This means that the XDS system can essentially prevent the front wheels from applying torque or increasing wheel rpm, allowing the rear wheels to receive 100% of the available torque.
The limited-slip feature is implemented through the use of brakes and ABS, similar to other normal cars on the road. The ABS system works to prevent wheel lock-up during braking, allowing the driver to maintain steering control and preventing the vehicle from skidding.
The Golf R also features automatic emergency braking, which can be abrupt and strong. While this system can be helpful in certain situations, such as when reversing or in forward collision detection, it is not something that drivers should solely rely on. The system can be overly sensitive, and it is important for drivers to remain alert and aware of their surroundings at all times.
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Frequently asked questions
The Golf R's AWD system is based on torque vectoring technology, which improves handling. The Haldex Coupling, a product of Swedish company Haldex Traction, uses an electro-hydraulic clutch to send power to the rear wheels when necessary, such as when the front wheels are slipping.
The Golf R's AWD system is activated by an electro-hydraulic oil pump that engages the rear axle when necessary. A control unit calculates the ideal drive torque for the rear axle and controls the multi-plate clutch by activating the oil pump. The oil pressure is proportional to the torque desired, allowing for continuous variation in the magnitude of the transmitted torque.
The Golf R's AWD system provides improved handling and performance, with better gas mileage than similar systems. It also offers greater stability and traction, preventing wheel spin during acceleration and off-road driving.
