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2007 Audi Q7 4.2 TDI

The Audi Q7 places the concentrated power of the V8 TDI, an engine with a displacement of 4.2 litres, into a vehicle concept that impresses with its versatile sportiness. Even at its debut, the Q7 model series set new standards in its segment. Now the 4.2 TDI is moving the bar even higher. Under the bonnet of the new Audi Q7 4.2 TDI is the most powerful diesel engine the brand has to offer. The 4.2-litre capacity of the V8, which already powers the A8 luxury saloon, generates an output of 240 kW/326 bhp and 760 Nm of torque at engine speeds between 1,800 to 2,500 rpm. The most powerful SUV on the market has the drivability of a sports car. The Audi Q7 accelerates from standstill to 100 km/h in 6.4 seconds and has a top speed of 236 km/h. These figures are also the new best marks in its segment.

The Audi Q7 4.2 TDI transmits its power through a six-speed tiptronic gearbox and a sportily tuned quattro driveline, which in normal situations splits propulsive force 40 percent to the front wheels and 60 percent to the rear axle. Audi’s "adaptive air suspension" is standard on this most powerful of diesels – it unites dynamic handling with the ride comfort of the luxury class.

The Audi Q7 4.2 TDI is also at the top of the tree with its standard convenience equipment. The leather design package gives the interior a noble feel. The electric tailgate makes lighter work of loading. A new feature is the Audi lane assist system, which emits a pulse to inform the driver before he inadvertently crosses a line on the carriageway.Like all the engines in the Audi Q7 series, the 8-cylinder diesel heralds from Audi’s new V-engine family. With a displacement of 4,134 cc, the large TDI has a maintenance-free chain drive on the gearbox side for its four camshafts and ancillaries. The angle between the cylinder banks is 90 degrees, the cylinder spacing 90 millimetres, the overall length just 520 millimetres. The crankcase is made of the high-tech material vermicular graphite cast iron. This forms the basis for the light weight of the engine – just 257 kilograms.

The V8 TDI is a masterpiece of engineering. The best examples: the crankshaft is forged from chrome-molybdenum alloy steel; the cylinders are of cast aluminium. Low-friction roller cam followers actuate the 32 valves; electronically actuated flaps give the intake air into a defined swirl.

Two turbochargers with variable-geometry turbines provide solid torque even at low engine speeds while still allowing a high power output. Large charge-air coolers reduce the temperature of the compressed air. The common rail fuel injection system contains compact Piezo inline injectors that are extremely precise and fast switching. They are capable of up to five injection sequences per working cycle.The Audi Q7 4.2 TDI is equipped as standard with the six-speed tiptronic automatic gearbox. The dynamic shift program (DSP) manages the gearshifts, whereby it orientates itself to the driver’s style and to the characteristics of the road. A special sport programme – the S programme – supports a particularly dynamic driving style. The driver can intervene at any time, either at the gear gate for the selector lever or at the optional paddles on the steering wheel. As the tiptronic in the Audi Q7 was designed for high torque from the very outset, it does not need to be specially reinforced to team up with the V8 diesel engine.

Like all Audi Q7 models, the 4.2 TDI has a self-locking centre differential with asymmetric/dynamic torque split. In regular operation, it transmits the drive force with a ratio 40:60 to the front and rear axles respectively. If needed, torque is distributed at varying ratios between the front and read axles according to the level of grip: optimum traction is provided at all times. This ultramodern quattro technology provides for sporty characteristics reminiscent of a rear-wheel drive vehicle, for exceptional agility and for a steering precision that is to the greatest possible extent free of influences from the driveline.

The new Audi Q7 4.2 TDI will be in the showrooms in the early summer.

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