New Audi RS4 Avant V6 450 HP Test Drive Review POV 2021

New Audi RS4 Avant V6 450 HP Test Drive Review POV 2021.

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Engine type: V6 engine
Displacement in cc / bore x stroke in mm / compression: 2894 / 84.5 x 86.0 / 10.0
Max. power output in kW (hp) / at rpm: 331 (450) / 5700 - 6700
Max. torque in Nm (lb-ft) / at rpm: 600 (442.5) / 1900 - 5000
Top speed in km/h (mph): 250 (155,3)
Acceleration, 0-100 km/h (0-62.1 mph) in sec : 4,1
Combined fuel consumption in l/100km : 8.8
Combined CO2-emissions in g/km : 201

The front section of the new RS 4 Avant was completely redesigned. The RS 4 Avant differs considerably from the A4 Avant. The Singleframe is wider and flatter as compared to the base model.

The gloss black, matt aluminum and carbon styling packages add individual accents to the inlay in the sill, the exterior mirror housings and the front and rear bumpers. Upon request, the gloss black and carbon styling packages also include the Audi rings and the RS logo in black on the front and rear. The RS badges can be omitted completely for a more understated look. The roof rails are designed in matt black as standard. The RS-specific roof edge spoiler and the diffuser insert as well as the chrome tailpipes of the RS exhaust system give the vehicle a distinct finish. The optional RS sport exhaust system with black tailpipe trims creates a particularly sporty sound experience. The driver can decide whether they want a sporty or subdued sound via the Audi drive select dynamic handling system.

With the 2.9 TFSI twin-turbo V6, Audi Sport GmbH is building on the legendary 2.7 liter V6 of the first RS 4 Avant from 1999. Back then, the twin-turbo V6 had a power output of 279 kW (380 metric hp). The new RS 4 Avant now outputs 331 kW (450 metric hp), which equals an output of 155.5 metric hp per liter. This allows the RS 4 Avant to accelerate from zero to 100 km/h (62.1 mph) in just 4.1 seconds. The TFSI engine weighs just 182 kilograms (401.2 lb), which is 31 kilograms (68.3 lb) less than the V8 engine in the predecessor model from 2012. This benefits the gross weight and the axle load distribution—two prerequisites for the impressive performance. The twin-turbo V6 applies an impressive 600 Nm (442.5 lb-ft) of torque to the crankshaft in a broad engine speed range from 1,900 to 5,000 rpm. The RS dynamic package increases the electronically governed top speed from 250 to 280 km/h (155.3 to 174.0 mph).

The two turbochargers of the 2.9 TFSI are each assigned to a cylinder bank and build up a boost pressure of up to 1.5 bar. Like with all V6 and V8 engines from Audi, the turbochargers are installed within the 90-degree interior “V” of the cylinder banks, and thus the exhaust side of the cylinder heads is on the inside, while the intake side is on the outside of the engine. This layout enables compact construction and short gas flow paths with minimal flow losses, allowing the 2.9 TFSI to respond particularly spontaneously to movement of the accelerator pedal.

The high-output V6 impresses not only with its strong performance but also with its high level of efficiency. In the new WLTP driving cycle, it consumes just 9.2 liters of fuel per 100 kilometers (25.6 US mpg), which corresponds to 211 grams of CO2 per kilometer (339.6 g/mi). This constitutes a consumption reduction by 17 percent as compared to the previous model. A decisive factor in this is the new TFSI combustion process from Audi, which is known as the B-cycle. It has been specifically designed for the partial-load range, which is the predominant operating mode during normal use. In the case of higher loads and rotational speeds, the two-stage Audi valvelift system (AVS) closes the intake valves later, thereby increasing the opening duration to a crank angle of 200 degrees. Simultaneously, valve lift increases from 6.0 to 10 millimeters (from 0.2 to 0.4 in).

The power of the 2.9 TFSI flows to the quattro permanent all-wheel drive system via the sporty eight-speed tiptronic. In regular driving, the system delivers more power to the rear axle. Its purely mechanical center differential directs 60 percent of the torque to the rear axle and 40 percent to the front. If undesired slip occurs at one axle, most of the power is automatically and rapidly redirected to the other axle—up to 70 percent to the front or up to 85 percent to the rear axle. The high locking values enable a clearly defined torque distribution and highly precise interaction with the control systems of the ESC and wheel-selective torque control.

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