Tapping into extra accelerative power becomes as quick and easy as flicking a light switch this week as the new 435PS Audi SQ7 TDI joins the range as the world’s first series production car combining turbocharging with an electrically powered compressor bringing breathtakingly immediate response. Consigning ‘turbo lag’ to history, the boundary-stretching technology underscores the newcomer’s eligibility for the ‘S’ badge that denotes extraordinary performance across the Audi range, and fittingly goes hand-in-hand with another major forward stride in dynamics – electromechanical active roll stabilisation for significantly reduced body roll.
At the heart of the new Audi SQ7 TDI is a redesigned V8 BiTDI engine that now develops 435 PS and 900 Nm (663.8 lb ft) of torque, firmly staking this performance flagship’s claim as the most powerful diesel SUV on the market. The electrically powered compressor dispenses with any sign of turbo lag from step-off acceleration, helping to set an outstanding 0-62 mph sprint time of just 4.8 seconds. Top speed is limited to 155mph, and in the New European Driving Cycle (NEDC), the SQ7 TDI returns up to 38.2 mpg combined. This corresponds to CO2 emissions of 194 g/km.
A new solution in the competitive environment is the optional electromechanical active body roll stabilisation. Here a compact electric motor with a three-stage planetary gearbox separates the two halves of the stabiliser. On an uneven road surface, they are actively decoupled from one another, resulting in improved ride comfort. During faster driving, the tubes are interconnected and twisted against each other. That significantly reduces body roll, i.e. the lean of the car. Together with the transmission, the electric motors produce anything up to 1,200 Nm (885.1 lb ft) torque. The effect is taut, precise handling: The car leans less in bends and the tendency to understeer is further reduced. The front and rear stabilisers can be adjusted independently of each other. This active distribution of forces between the front and rear axle has a positive effect on road behaviour. Steering precision and the agility of the car improve significantly.
Compared with conventional hydraulically switched stabilisers, the 48 volt-based system from Audi offers major advantages. It can develop more power, it works faster and it is activated even at low speeds. Because it requires no oil, the electromechanical active roll stabilisation is also maintenance-free and environmentally friendly.
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