Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Acceleration assistance (race-start function)
Conditions for acceleration assistance:
- High-grip road surface
- Dynamic Stability Control DSC deactivated (DSC button pressed for longer than 3 seconds)
- SPORT button pressed
Acceleration assistance allows optimum vehicle acceleration from standstill, on a par with motor racing standards. Normally, the clutch engages at approx. 1300 RPM. With the acceleration assistance, the engine speed is increased to approx. 4000 RPM before the SMG closes the clutch. To make use of this, the driver merely has to depress the accelerator pedal quickly and completely (kickdown). Forced upshift in manual mode (only with race-start function) makes sure that the engine is unable to reach a critical speed. The race-start function is deactivated by cancelling the kickdown function via the accelerator pedal position, by deactivating the Dynamic Driving Control FDC with the SPORT button or by activating DSC.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.