1. Transcript of the "Driving stability control system" (DSC) and "Driving Dynamics Control" sections of the M2 instructions manual (DSC OFF, TRACTION, SPORT+, SPORT, COMFORT, etc.):
EDIT: the original section #1 was replaced by pages 114 to 118 of the M2 owner's manual 2016 (US version) (which was not yet electronically made available at the time of creating this thread).
2. Excerpts from the M2 Press Kit (that you can find here | M2 manuals sticky: here) about M Servotronic steering (EPS), Active M Differential and MDM:
Two settings for the Electric Power Steering.
The standard-fitted Electric Power Steering of the new BMW M2 also helps to imbue it with the unique BMW M driving feeling. The development of the system prioritised hallmark M attributes, such as direct steering feel, precise feedback on the driving situation and driving at the limit. The integrated Servotronic function with M-specific characteristics controls the level of steering assistance electronically according to the car’s speed. Added to which, the steering of the new BMW M2 also offers two settings – COMFORT and SPORT/SPORT+ – which can be selected by pressing the Driving Experience Control switch. This allows drivers to adjust the steering’s power assistance at any time to the task at hand or to their personal preferences. SPORT mode can be configured via iDrive. The engine and steering settings can be stored in SPORT mode either as a combination or individually.
Unlike conventional hydraulic steering systems, the new BMW M2’s Electric Power Steering does not require any energy when the car is being driven in a straight line or standing still with the engine running. This enables a reduction in fuel consumption of 0.3 l/100 km.
Permanent, fully variable differential control.
The Active M Differential in the new BMW M2 optimises traction and maximises directional stability. This electronically controlled multi-plate limited-slip differential takes traction and directional stability to a new level.
The multi-plate limited-slip differential is proactively controlled with extremely high precision and speed. The locking effect can be varied between 0 and 100 per cent according to the driving situation. Sensors including those of the DSC (Dynamic Stability Control) system determine the car’s steering angle, accelerator position, brake pressure, engine torque, wheel speed and yaw rate. The control unit uses this analysis of the driving situation to detect the threat of traction loss on one side of the car and calculates the required locking effect, which is engaged by an electric motor. Full locking power of 2,500 Nm (1,843 lb-ft) is available within 150 ms. This allows the system to prevent a wheel from spinning in extreme conditions on slippery road surfaces or when the two rear wheels are experiencing significant differences in friction coefficient.
In certain situations the Active M Differential even works proactively. When pulling away on slippery surfaces, the lock is closed by a defined percentage even before a wheel can start to spin, to ensure that both wheels develop equal slip at the same time. This optimises traction and stability. The lock is also closed by the required percentage through enthusiastically driven corners, according to the levels of lateral acceleration and drive at work. This prevents the low-traction inside wheel from starting to turn too quickly.
This permanent and infinitely variable differential control also increases agility, avoids understeer on the way into corners and improves directional stability under braking and load changes.
Drifts on the race track.
M Dynamic Mode (MDM) also enables the new BMW M2 to satisfy the demands of drivers looking for a little extra on the dynamic front. MDM is a sub-function of Dynamic Stability Control (DSC). DSC effectively counteracts incipient oversteer or understeer or a loss of traction by taking steps (reducing engine power, braking individual wheels) to stabilise the car. However, in certain situations – e.g. sporty and dynamic driving on the race track – a greater degree of wheel spin can be an advantage.
Here, M Dynamic Mode, which is activated automatically in the recommended track mode (SPORT+) or can be engaged with a short dab of the DSC button, allows greater slip. The stabilising measures familiar from DSC mode now intervene later, increasing the freedom available to drivers at the dynamic limit.
The extra wheel slip enhances traction and therefore propulsion. More significant oversteer and understeer are possible, as are moderate, controlled drifts, but the Dynamic Stability Control active safety aids can still be relied on in critical situations. In any event, responsibility for stabilising the car always lies with the driver.
3. Excerpt from the M2 Technical Training (tables) (that you can find here | M2 manuals sticky: here):
Forum fellow
Tag retooled the table to make it more intelligible:
