Low speed
When starting on a slippery surface the following will happen:
The drive wheel with least grip starts to spin first. When the wheelspin reaches about 8 km/h (5 mph), TCS modulation starts by applying the brakes.
When the wheel is braked, additional tractive effort is transferred to the other wheel which still has a grip on the road. If the road surface does not have much friction, the other wheel may also start to spin and when it reaches about 6 km/h (4 mph), the TC/ABS control module sends a request to the Trionic for engine torque limitation which then prevents further wheelspin.
The optimum combination of tractive power and steering ability is thus achieved as well as the same traction as with the use of a differential brake.
The upper limit for permitted wheel spin before modulation is engaged then gradually drops until a vehicle speed of about 22 km/h (13.5 mph) is attained and then increases again for engine torque limitation and brake application.
A relatively high degree of wheelspin is accepted when starting in order to retain the feeling of sportiness and also enable the wheels to dig themselves down to a firmer surface whenever conditions make this necessary.