When Jumping Jack puts on his racing suit, the innovative M xDrive drivetrain system of the all-new BMW M5 allows complete control over driving dynamics and traction. That’s the punchline BMW is using to explain the all-new M xDrive system for the equally new F90 M5.
The M xDrive system enables the rear-biased set-up by only bringing the front wheels into play when the rear wheels aren’t able to transmit any more power to the road and additional tractive force is required. The driver can choose from five different configurations based on combinations of the DSC modes (DSC on, MDM, DSC off) and M xDrive modes (4WD, 4WD Sport, 2WD).
The principal hardware components of M xDrive are based on those of the BMW xDrive intelligent all-wheel-drive system and the Active M Differential, while the M-specific driving dynamics control software ensures innovative deployment. The drivetrain has been reinforced for greater rigidity and strength to factor in the high torque, rear-biased configuration and 2WD option. While the transfer case splits a portion of the engine’s drive between the front and rear wheels in a smoothly adjustable ratio (depending on requirements), the Active M Differential is responsible for then distributing the drive between the rear wheels.
This active control element is part of the M xDrive system’s functionality and its locking effect can be varied between zero and 100 per cent, as the situation demands. This ensures enhanced traction, agility and handling stability when the car is being driven in a very sporty manner or on roads with differing levels of grip – i.e. exactly when it is needed. Since M xDrive includes M-specific dynamics control capability, stabilising interventions from the DSC system are only required in extreme situations. And so the engine’s huge power can be converted into propulsive force with virtually zero losses.
Every time the engine is started, the BMW M5 defaults to 4WD mode with DSC on.
Here is the video: