The developer's secret weapon has the working title ARB and is intended to help make the BMW 1 Series F40 the benchmark in its class. ARB stands for Actorn-related wheel slip limitation and describes in the finest developer Denglish a system that can basically be imagined as a particularly fast-working DSC. The trick is to relocate the slip regulator from the conventional DSC control unit to the engine management system, which is why many problems can be combated before they arise. The control systems constantly analyze how high the coefficient of friction of the ground is and therefore know very precisely which forces can be transmitted at the moment.
In this way, it can be defined in advance how much torque the motor may provide in the current situation. The information on the maximum wheel slip results in a maximum engine speed which, if exceeded, would inevitably lead to the wheels spinning. While conventional ESP systems only act in such a situation when the wheel has already spun and lost its grip, ARB prevents the wheel speed from being too high by limiting the engine speed in advance. The advantage: Because the situation is still completely under control at the moment of the intervention, much smaller interventions are sufficient for the desired stabilization - braking interventions perceived as patronizing are normally not necessary and the typical understeer due to a loss of traction on the front axle is not necessary