Audi RS 4

The original B5 Audi RS 4 Avant quattro ('''Typ 8D''') was introduced by Audi in late 1999, for main production and sale from 2000, as the successor to the Porsche / Quattro GmbH joint venture-developed Audi RS2 Avant. Like its predecessor, the RS 4 was available only as an Avant and was built on an existing platform, in this case, the Volkswagen Group B5 platform shared with the A4 and S4. Retail price was around DM 103,584. The RS 4 was available for sale in most of Europe, parts of Asia and in some Latin American countries. Audi produced 6,030 units between 1999 and 2001. B5 bodywork and styling Although related to the B5 S4, many of the outer body panels were altered, with wider front and rear wheel arches to allow for the wider axle track on the RS 4. With unique front and rear bumpers and side sills, and the rear spoiler from the S4 Avant, the aerodynamic modifications achieved a drag coefficient of Cd 0.34. Although the B5 S4 came in a saloon car body style, the B5 RS 4 was only available in the Avant version. Luggage space, measured according to the industry standard VDA method was with the rear seats in the upright position, and with the seats folded flat. B5 powertrain (red) and torque (blue) curves The engine was developed from the 2.7 litre 90° V6 'biturbo' used in the B5 S4. It displaced and had five valves per cylinder. The engine was developed and manufactured in the UK by Cosworth Technology. It featured aluminium alloy ALSi7Mg cylinder heads, cast by Cosworth, with enlarged intake ports and smaller exhaust ports, two parallel BorgWarner K04-series turbochargers, two larger side-mounted intercoolers, dished piston crowns, stronger connecting rods, larger intake ducting, an enlarged exhaust system, and a re-calibrated engine management system. The modifications increased the engine's output from and of torque to at 7,000 rpm and at 6,000 rpm. The engine was controlled by a Bosch Motronic ME 7.1 electronic engine control unit, using a Bosch 'E-Gas' electronic drive by wire throttle. It had multipoint sequential fuel injection, a mass airflow sensor, and six individual ignition coils. The engine oil was cooled by oil to water and oil to air coolers. A six-speed manual transmission (parts code prefix: 01E, identification code: FDP) (gear ratios—1st: 3.500, 2nd: 1.889, 3rd: 1.320, 4th: 1.034, 5th: 0.806, 6th: 0.684), cooled by a NACA duct in the engine undertray, and Audi's Torsen-based quattro system, using the Torsen T-1 "automatic torque biasing" center differential, with a 50:50 default bias were standard. Final drive ratio was 4.111. The RS 4 has a curb weight of . It can accelerate from 0- in 4.9 seconds, 0- in 11.3 seconds, and 0- in 17.0 seconds. The top speed is electronically limited to . B5 brakes, wheels and tyres Brakes were also developed jointly in house by Audi's quattro GmbH, not by Porsche as with its predecessor, the RS2. At the front they were radially vented and floating cast iron discs, diameter and thick, with double-piston floating calipers, and at the rear by discs with a single-piston floating caliper. The RS 4 needed less than to come to a full stop from a speed of . The standard wheels were 18 inch alloy wheels (8½×18" "9-spoke"), with 255/35 ZR18 high performance tyres. Optional "winter" alloy wheels were also available, at 18 inch (7½J×18"), with tyres. Other B5 notable features • "Sideguard", Audi's curtain airbag system. • Xenon High-Intensity Discharge (HID) headlamps. ==B7 (Typ 8E, 2006–2008) ==

There was no RS 4 built on the Audi "B6" platform, which served as the basis for the Audi A4 between 2001 and 2005. However, the second Audi RS 4 quattro ('''Typ 8E''') was built on Audi's "B7" platform, by quattro GmbH The RS 4 became available to European customers in mid-2006. It was introduced at the 2006 North American International Auto Show in January, and arrived in June 2006 in North America. The production run of the B7 RS 4 was 2006 to 2008 inclusive, although only 2007 and 2008 model year were sold in the United States. Approximately 10,000 B7 RS 4s were built, of which around 2,000 are in the USA. The B7 RS 4 Cabriolet was sold in Europe from late 2006 to 2008. It was also available in the US in limited numbers per year and sold at a premium of $2000 over the list. Audi factory numbers indicate that the B7 RS 4 saloon can accelerate from in 4.8 seconds, For the Avant, is reached in 4.9 seconds. Top speed for all variants is "officially" electronically limited to . for both inlet and exhaust camshafts, electronic engine control units (working as 'master' and 'slave', because of the high-revving nature of the engine). The ignition system uses eight individual single-spark coils using mapped direct ignition. That means that one side of the differential can handle up to 80%, while the other side would have to only handle 20% of applied torque. Front and rear axle differentials are conventional "open" types, with a final drive ratio of 4.111. B7 awards The Audi RS 4 won Top Gear's Most Surprising Car of the Year in 2005. In 2007, the Audi RS 4 was the winner in the "World Performance Car" category of the International World Car of the Year (WCOTY). ==B8 (Typ 8K, 2012–2015) ==

}} The Audi RS 4 Avant quattro was unveiled at the 2012 Geneva Motor Show and was based on the B8 A4 Avant. The RS 4 Avant uses the Volkswagen MLB platform, and shares the same powertrain as the RS 5 Coupé. B8 bodywork and styling Compared to the related B8 S4, the RS 4 features larger bumper air dams and features double exhaust tailpipes compared to the S4's double twin (quadruple) exhaust tailpipes. Wider arches allow for a wider axle and wheels. It also features a completely remodelled front bumper cover with honeycomb grill compared to the standard A4 and S4, as well as a remodelled rear bumper with honeycomb detailing and minor air diffuser. This generation also reverts to only being offered as an Avant. The interior is largely the same but the flat-bottom steering wheel is covered entirely in perforated leather with RS badging on the steering wheel and gear stick. The interior dashboard and door liners are also detailed with carbon fibre inserts as standard although there were options to change this to aluminium or piano black. SuperSport seats covered partly with leather part Alcantara were standard in the B8 RS 4 but as with the B7, there was a winged backed bucket seat option. It was also an option to order the seats covered entirely with leather. B8 powertrain The RS 4 is powered by a 4.2L FSI V8 engine producing and , allowing the car to accelerate from in 4.2 seconds. The RS 4 Avant is available with a 7-speed dual-clutch S-Tronic transmission. B8 brakes, wheels and tires New for the B8 are 'wavy' vented and floating cast iron discs, diameter and thick, with 6-piston Brembo floating calipers, and at the rear by discs with a single-piston floating caliper. The standard wheels were 19 inch with 235/40 R19 Pirelli P-Zero tyres. Optional 20" rotor design or 10 spoke alloy wheels were also available with 265/30ZR20 Pirelli P-Zero tyres. Other B8 notable features Amongst the options available for the B8 RS 4, are ceramic brakes, allowing the car to perform heavy braking without having brake fade. A sports pack was available which included a Sports exhaust identifiable by black exhaust tips in the rear bumper, and Dynamic Ride Control suspension. The Sports pack also came with the 20" rotor design wheels as standard. A total of 7000 units of the Audi B8 RS 4 were built. RS4 Nogaro Selection Limited Edition In February 2014, Audi announced a tribute to the original RS 2 Avant on its 20th anniversary by releasing a limited run of the Nogaro Selection Limited Edition. The changes were entirely cosmetic, with black trim and roof rails, red brake calipers, and blue Alcantara detailed interior (seats, door lining, blue carbon weave elements & blue stitching), as well as the limited edition Nogaro Blue exterior paint. It retailed at approximately 10% more than the standard model. Some ~200 were manufactured, with approximately 39 in RHD being registered in the UK. . ==B9 (Typ 8W, 2018–2026) ==

}} The B9 RS 4 Avant was unveiled at the 2017 Frankfurt Motor Show. Noticeable changes include a more angular exterior and newly designed wheels. The B9 RS 4 Avant is powered by a 2.9 TFSI V6 twin-turbo engine producing and of torque. This means that the RS4 B9 produces the same power as the previous model (B8) while making more torque (extra 170 Nm) from a smaller displacement engine, resulting in better fuel efficiency and acceleration. This 2.9TT V6, (known as the EA839; the DECA variant), is also shared with the Porsche Panamera lineup. The highest trim available of Panamera with this engine is the Panamera 4S. Unlike the B8 RS 4, which had a 7-speed dual-clutch S-Tronic transmission, the new RS 4 Avant is available with an 8-speed 'Tiptronic' automatic transmission. File:2018 Audi RS4 TFSi Quattro Automatic 2.9 Rear.jpg|Rear File:2023 Audi RS4 Avant in Navarra Blue 03.jpg|Interior ==Motorsport==

Speed World Challenge The B7 RS 4 was planned to replace the C5 RS6 in the Sports Car Club of America (SCCA) Speed World Challenge, but after Champion Racing had prepared the car, it was decided not to compete in the series, due to rule changes imposed by the SCCA on Audi concerning 4WD systems, wheel size, and engine power output. Rather than scrapping the fully built Speed World Challenge RS 4, Champion Racing and Audi used the car as a part of the American Le Mans Series Vitesse Program, which highlights the technology link between race cars and conventional series production road cars. Euro Superstars Six RS 4s are openly campaigned in the Superstars Series by Audi Sport Italia. Audi RS 4 Quattro driver Gianni Morbidelli won the 2007 and 2008 championships. ==See also==