New System Description

New System Description
The Dynamic Stability Control system (DSC MK 60) currently in the E46 is carried over to the (E85) Z4.In addition to the ABS, ASC and CBC functions, the DSC system incorporates a further function in the (E85) Z4, Dynamic Traction Control (DTC). The DTC function can be activated with the DSC button and provides two subfunctions:
^ Sports tuning of the Automatic Stability Control (ASC) + Dynamic Stability Control (DSC)
^ Improved traction, particularly on ground surfaces with a low coefficient of friction
All other functions have essentially remained the same. A DTC indicator light illuminates in the instrument cluster when the DTC function is activated. The DSC warning light in the instrument cluster flashes when intervention is necessary and takes priority over all other functions (as in current E46 vehicles).
In certain situations (i.e. accelerating on an uphill gradient on a snow covered road), the previous ASC function provided brake intervention at the spinning wheel and extremely reduced the engine output. Although the vehicle remained extremely stable, minimal propulsion was available.
DTC achieves maximum possible traction essentially by expanded ASC and DSC control thresholds. Compared to the ASC/DSC function, DTC mode allows a little more "drift" at low speeds and transverse acceleration (increased rear wheel spin is permissible up to a speed of approximately 45 mph). This allows the engine power output to remain without an extreme reduction of power, improving propulsion.
On approaching higher speeds and transverse acceleration (measured by the yaw rate sensor), the DTC function acts more and more like the "normal" ASC and DSC function and the slip thresholds are reduced back to a conservative mode for stability reasons.

Brake Force Display





To improve the reaction of other drivers in a panic stop, the (E85) Z4 has a Brake Force Display system. If a decaloration of more than 5m/s- or an ABS signal is detected, the bulbs in compartment 3 are activated by the light switch center. They will then receive the full 21 Watts of power and the brake light plus Brake Force Display function is illuminated.