The Golf R transfers the TSI's power to the road via the latest generation of Volkswagen's 4MOTION all-wheel drive system, which is standard equipment. Compared to the version implemented in the Golf R32, the system underwent significant advanced development. Above all, power transmission between the front and rear axles – especially the all-wheel differential that operates in an oil bath – demonstrates clear advantages compared to the previous generation. The most important one: Activation of the all-wheel differential no longer requires a difference between the front and rear axle speeds.
That is because, and this is different than on the previous generation, an electric pump is being used to build pressure for the first time. The electric pump supplies oil to a hydraulic reservoir with a working pressure of 30 bar. A control module computes the ideal drive torque for the rear axle, and it uses a valve to control how much oil pressure is applied to the working pistons of the multi-plate clutch. The contact pressure at the clutch plates rises in proportion to the desired torque at the rear axle. The amount of torque that is transferred can be varied continuously by the amount of pressure applied to the clutch plates. Unlike the previous 4MOTION generation, the system operates independent of slip, since the system's working pressure is always available. When starting up and accelerating, spinning of the wheels at the front axle is prevented more effectively, since the control module regulates torque distribution based on dynamic axle loads. In extreme cases, nearly 100 percent of the drive torque can be directed to the rear axle, a plus in terms of active safety and dynamic performance.
Note:
Equipment information and technical data apply to models offered in Germany. They may differ in other countries. All information subject to change and correction.
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