Intervention of the Motronic Unit In the Sport Chrono Functions

Intervention Of The Motronic Unit In The Sport Chrono Functions:

The optionally available Sport Chrono Package markedly increases driving pleasure, performance and vehicle dynamics. Sport mode can be activated via a button in the center console.

NOTE: Details concerning the function of the Sport Chrono Package Plus can be found in this Technical Service Information.

Motronic modifies the following functions when the Sport Chrono button is active:

More Dynamic Accelerator Pedal Characteristic







The electronic accelerator pedal (electronic throttle) has been used on the Boxster and Boxster S since model year 2000. With this system, the accelerator pedal position is converted into electrical signals via pedal encoders and forwarded as a control signal to the electronic throttle via the Motronic control module. The "conversion" between accelerator pedal angle and throttle angle is performed in the Motronic control unit. Sensitivity and therefore driveability in the lower speed and load range are factors here, as is even transmission across the entire pedal or throttle travel.

When the Sport Chrono button is active, a more dynamic accelerator pedal characteristic produces a more spontaneous engine response, underlining the sporty character. This is achieved via a steeper rise for the electronic throttle characteristic by way of a shorter "conversion" between accelerator pedal and throttle angle. This means that the throttle is opened further or faster with the same accelerator pedal travel and selected Sport Chrono function (with Tiptronic S only in the manual "M" position). In the interests of safety, the activated Sport Chrono function only takes effect after the driver has taken his or her foot from the accelerator or accelerated at full throttle.







Hard Engine Speed Limiter

To increase driving comfort a "gentle" cut-off is generally used when accelerating and reaching the engine speed cut-off setting. In the process the throttle is continuously closed when approaching the limit range for speed. While this comfortable control process prevents abrupt interruption of the acceleration process by the engine speed limiter, it does not provide the driver with a clear indication as to when upshifting is necessary.

The Sport Chrono function facilitates additional acceleration potential through the use of an abrupt engine speed cut-off by switching off individual cylinders (injection and ignition) in a rotating fashion just shortly before the engine speed limit. The perceptible limit of acceleration lets the driver know if an upshift is executed too late. This allows the driver to learn how to identify the optimum shift point with more accuracy and to make better use of the engine's full potential for acceleration.

When the Sport Chrono button is pressed, the abrupt cut-off is active in 1st to 5th gears for the manual gearbox (without Sport Chrono function only in 1st and 2nd gears).

Increased Sporty Load Cycle Behavior

When the Sport Chrono function is selected, the transfers between acceleration and deceleration become sportier. This means that injection and ignition are switched on and off more directly when accelerating and particularly when decelerating, resulting in a more spontaneous and dynamic load cycle.