Opel Insignia: Adaptive 4X4: More traction, exciting driving dynamics

Both of the Insignia's turbocharged gasoline engines are available with the newest-generation advanced all-wheel-drive system. The all-wheel drive system also will be available on future, more powerful diesel versions. Called Adaptive 4X4, it is designed to optimize handling and driving stability in all conditions, as well as increase traction at take-off and on slippery surfaces. Under electronic control, the Haldex hydraulic rear clutch unit continuously adjusts and optimizes drive torque distribution between the front and rear axles.

The Adaptive 4X4 control unit is fully networked with the Insignia's other control systems. It consists of a Power Take-off Unit (PTU) in the front final-drive that transmits engine torque through a prop-shaft to the Rear Drive Module (RDM), which includes a Torque Transfer Device (TTD) and the optional rear Limited Slip Differential (eLSD).

Adaptive 4X4 processes signals from the ESP sensors, the steering angle sensor and accelerator pedal position to adapt power distribution to the prevailing driving situation. While offering better traction in low friction conditions, the sophisticated operation of the Adaptive 4X4 improves stability in all situations. In this way, it adds a further dynamic dimension to the driving experience by increasing the scope for closer driver involvement.

In the Sport variant, Adaptive 4X4 is coupled with an electronically-controlled eLSD. Chassis control is taken a step further with the optional rear eLSD. It is installed alongside the RDM and operates via pressurized clutch plates on a principle similar to the larger TTD. In icy or wet split-friction conditions, for example, it uses input from the rear wheel speed sensors and can transfer up to 50% of torque between the drive shafts, to whichever wheel has more grip.

The eLSD also gives the driver enhanced control when cornering hard or completing a high speed maneuver, such as a lane change, by momentarily applying more or less torque to either of the wheels to help the rear of the car more closely follow the direction of the front wheels. That way, the eLSD can keep the Opel Insignia better balanced and more tightly controlled without requiring 'outside' intervention from ESP.

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