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Audi brings back diesel SQ5 with massive torque

Audi has launched a new SQ5 TDI model with a massive 700 Nm (516.3 lb-ft) of torque and a power output of 347 PS (255 kW). The new Audi SQ5 TDI has a powerful V6 engine just like its successful predecessor of the first generation. An electric powered compressor ensures that maximum torque is available to the sporty SUV at just above idle; a mild hybrid system further enhances efficiency.

The 3.0 V6 TDI engine offers its maximum torque across a broad range from 2,500 to 3,100 rpm. The V6 diesel accelerates the SUV to the benchmark 100km/h in 5.1 seconds on its way to an electrically limited top speed of 250 km/h (155 mph). The SQ5 TDI is certified according to the Euro 6d-temp emission standard.

Audi has refined the drive concept from the full-size SQ7 TDI for the new SQ5 TDI. The 48-volt main electrical system includes an electric powered compressor (EPC) and a mild hybrid system. Energy is stored in a compact lithium-ion battery with an electrical capacity of 10 Ah located beneath the luggage compartment floor. An AC/DC converter connects the conventional 12-volt electrical system.

The electric powered compressor is the ideal assistant for the turbocharger. It helps out whenever the exhaust gas flow provides too little energy to drive the turbocharger, i.e. when starting off and accelerating in the low-rev range up to 1,650 rpm. High torque is available immediately with no turbo lag whenever the driver needs it, whether starting off, passing or exiting a curve. In everyday driving situations, the early and rapid torque development made possible by the technology keeps revs and fuel consumption low.

The electric powered compressor is located in the intake air path downstream of the intercooler and close to the engine. If the load demand from the accelerator is high but there is still too little boost from the turbocharger, the EPC comes into play. A compact electric motor with an output of 7 kW accelerates the compressor wheel to 65,000 rpm in roughly 300 milliseconds, producing a relative boost pressure of 1.4 bar.

The MHEV system (mild hybrid electric vehicle) in the new Audi SQ5 TDI can reduce real-world fuel consumption by as much as 0.7 liters per 100 kilometers. At its core is a belt alternator-starter (BAS) connected to the crankshaft. During deceleration, it can recuperate up to 12 kW of energy. This electrical energy is stored in the lithium-ion battery, from where it is dynamically distributed to the consumers in the electrical system.

If the driver lifts off the accelerator at a speed between 55 and 160 km/h (34.2 and 99.4 mph), the new Audi SQ5 TDI can, depending on Audi drive select setting and driving situation, either recuperate, roll at idle with the clutch disengaged or coast with the engine off for up to 40 seconds. The BAS restarts the engine the next time the accelerator is depressed, and that noticeably faster and more smoothly than a conventional starter. MHEV technology allows for start/stop operation at a speed of up to 22 km/h (13.7 mph). If the vehicle is equipped with the adaptive cruise control (ACC), the engine restarts while the brake pedal is still depressed as soon as the vehicle in front of the SQ5 TDI begins to move.

This 3.0 V6 TDI engine has been further developed and modified. Crankshaft, pistons, connecting rods and oil management have all been specially configured for the more stringent demands. The thermal management system is highly versatile. The crankcase and the cylinder heads have their own cooling circuits, allowing the engine oil to warm up quickly after a cold start. The coolant flow is directed to the oil cooler, the EPC, the BAS and the turbocharger as needed. The large exhaust gas turbocharger with variable turbine geometry (VTG) produces a relative boost pressure of up to 2.4 bar. A sound actuator in the exhaust system gives the TDI a sonorous sound.


Like every S model from Audi, the new SQ5 TDI comes standard with quattro permanent all-wheel drive. In normal driving conditions, its self-locking centre differential distributes torque between the front and rear axle in a 40:60 ratio. When slip is detected, the majority of the power is directed to the axle with the better traction. Depending on the driving situation, a maximum of 70 percent can flow to the front or 85 percent to the rear.

The new Audi SQ5 TDI comes standard with 20-inch cast aluminum wheels and 255/45-series tyres. 21-inch wheels are available as an option.

The headlights and rear lights of the Audi SQ5 TDI come standard in LED technology; the dynamic turn signals at the front and rear send unmistakable signals. The exterior mirror housings and the clasp on the diffuser sport a shining, aluminium-look finish. Door trim strips in the body color underscore the sportiness. The exterior color panther black is reserved exclusively for the Audi SQ5 TDI.

The dark-toned interior welcomes the driver and passengers with illuminated door sills bearing exclusive S logos. Contrasting stitching on the leather steering wheel and sport seats conveys a dynamic and elegant ambiance. The S sport seats in leather and Alcantara can be upgraded to fine Nappa leather with rhombus pattern and a pneumatic massage function. Brushed aluminum inlays are standard, with elegant wood applications or an exclusive carbon inlay available as options. The shift paddles on the steering wheel sport an aluminum-look finish; there are stainless steel applications on the pedals and footrest.

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