The Audi RS 4 is the high-performance variant of the Audi A4 range produced by Audi Sport GmbH for AUDI AG, a division of the Volkswagen Group. It sits above the Audi S4 as the fastest, most sports-focused car based on the A4's "B" automobile platform. The RS 4 was reintroduced in 2012, based on the A4 Avant instead of the sedan as did the original model.
The original B5 version was produced only as an Avant, Audi's name for an estate car/station wagon. The second version, the B7, was released initially as a four-door five-seat saloon/sedan, with the Avant following a short while later. A two-door four-seat Cabriolet version was subsequently added.
The "RS" initials are taken from the German RennSport—literally translated as "racing sport", and is the Audi marque's highest trim level, positioned above the "S" model specification of Audi's regular model line-up. Like other Audi "RS" cars, the RS 4 pioneers some of Audi's latest advanced technology. It is only available with Audi's Torsen-based "trademark" quattro permanent four-wheel drive system.
The original B5 Audi RS 4 Avant quattro (Typ 8D)[3] 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 DM103,584. 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.[citation needed]
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 Cd0.34. 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 390 litres (13.8cuft) with the rear seats in the upright position, and 1,250 litres (44.1cuft) with the seats folded flat.
B5 powertrain
Audi B5 RS 4 engine power (red) and torque (blue) curves
The engine was developed from the 2.7litre 90° V6 'biturbo' used in the B5 S4. It displaced 2,671 cubic centimetres (163.0cuin) 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 195kW (265PS; 261bhp) and 400N⋅m (295lbf⋅ft) of torque to 280kW (381PS; 375bhp) at 7,000rpm and 440N⋅m (325lbf⋅ft) at 6,000rpm. The engine was controlled by a Bosch Motronic[4] ME7.1 electronic engine control unit, using a Bosch 'E-Gas'[5] 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 1,620kg (3,571lb). It can accelerate from 0-100km/h (62.1mph) in 4.9seconds, 0-160km/h (99.4mph) in 11.3seconds, and 0-200km/h (124.3mph) in 17.0seconds. The top speed is electronically limited to 250km/h (155mph).[6]
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, 360mm (14.2in) diameter and 32mm (1.26in) thick, with double-piston floating calipers, and at the rear 312mm (12.3in) by 22mm (0.87in) discs with a single-piston floating caliper. The RS 4 needed less than 50 metres (160ft) to come to a full stop from a speed of 110km/h (68mph).
The standard wheels were 18inch alloy wheels (8½×18" "9-spoke"), with 255/35ZR18 high performance tyres. Optional "winter" alloy wheels were also available, at 18inch (7½J×18"), with 225/40 R18 92V tyres.
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[8] (Typ 8E) was built on Audi's "B7" platform, by quattro GmbH[8] in Neckarsulm, Germany. It was unveiled in February 2005 at Audi's 'quattro Night' celebration at the company headquarters in Ingolstadt, Germany.[9]
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.[citation needed]
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 0 to 100km/h (0 to 62mph) in 4.8seconds,[7][8] and arrive at 0 to 200km/h (0 to 124mph) in 16.6seconds.[7][8] Most European magazines recorded results in line with the November 2009 comparison of "ultimate sedans" in Road & Track, which recorded a 0 to 60mph (97km/h) time of 4.5 seconds.[10] For the Avant, 0 to 100km/h (0 to 62mph) is reached in 4.9seconds. Top speed for all variants is "officially" electronically limited to 250km/h (155.3mph).[7][8]
B7 bodywork and styling
Audi RS 4 Cabriolet quattroAudi RS 4 Avant
The B7 RS 4 is an almost complete departure from previous Audi "RS" cars, as it was initially available as a four-door five-seat saloon/sedan;[7] with a five-door five-seat Avant, and two-door four-seat Cabriolet versions arriving later. Only the Audi RS 6 had taken this similar route (saloon and Avant) before, unlike the previous RS 4 and RS2, which were available exclusively as Avants.
Constructed from fully galvanised steel[7] unibody,[7] the B7 RS 4 uses aluminium for its front wings (fenders) and bonnet (hood).[8] The saloon version features a drag coefficient (Cd) of 0.31,[7] from a frontal area of 2.17m2.[7]
The B7 RS 4 differs visually from the standard B7 S4, by having even wider flared front and rear wheel arches (fenders),[8] to allow for a wider axle track. Over the B7 A4, it also includes two larger frontal side air intakes[8] (for the two additional side-mounted coolant radiators). The B7 RS 4 also includes optional adaptive headlights, which swivel around corners in conjunction with steering wheel movements. An acoustic parking system with front and rear sensors is also a standard fitment.[8] Unique carbon fiber interior trims,[8] along with a lap timer within the central Driver Information System,[8] aluminium pedal caps and footrest,[8] and RS 4 logos[8] complete the look.
In the saloon, luggage space, measured according to the VDA 'block method',[7] is 460 litres (16.2cuft) with the rear seats in the upright position,[7] and 720 to 833 litres (25.4 to 29.4cuft) with the seats folded flat[7] (dependent on specification). For the Avant, 442 litres (15.6cuft) is available with the seats upright (under the retractable load cover), and 1,354 litres (47.8cuft) being available with the rear seats folded flat (loaded to the roofline). Kerb weight of the saloon variant starts at 1,650kg (3,638lb).[7]
A Bose ten-speaker sound system, with 190watt output and automatic dynamic noise compensation, with "Concert II" radio and single CD player is standard equipment. Additional options include the "Symphony II"[8] system which features twin radio tuners, a single-slot loading six-CD changer, and a cassette player all integrated into a double-DIN sized unit. The RNS-E "Audi Navigation System plus"[8] DVD-ROM GPS was also available.
B7 interior safety
To achieve maximum body stiffness with controlled deformation crumple zones, the B7 RS 4 features laser beam welding of major seams of the high-strength steel body shell, which helps improve overall structural rigidity, particularly in the "passenger cell", over traditional spot welding methods.
Two-stage driver and front-seat passenger frontal airbags are standard,[8] as is Audi's "side guard" head protection curtain airbag system.[8] This latter system completely covers all of the side windows, from the front "A" pillar to the rear "C-" or "D pillars".[8] The Recaro shell-type RS race bucket seats (not available in North American markets) include electrically inflatable upper and lower side bolsters and adjustable lumbar support.[8] In North America, the only front seats available are the more traditional Recaro seats (identical to those in the B6 and B7 S4), which include lower side airbags. Lower side airbags are optional for the standard-fit Recaro rear seats. Front and outer rear seatbelts include pyrotechnic belt pretensioners.
B7 powertrain
The 4.2L (4,163cc)32v V8 engine of the B7 RS 4 is based on the previous 4.2L (4,163cc) all-alloy 40v V8 from the B6 S4, and shares many parts, and Fuel Stratified Injection, with the 4.2 FSI V8 engine in the Q7. The engine includes new cylinder block construction, and is a highly reworked, high-revving variant (redline at 8,000rpm; rev limit of 8,250rpm).[8]
The same engine base was used for the Audi R8 when Audi chose to build their first supercar. However, the camshaft drive system was moved to the front of the block for the mid-engine R8.
The engine has increased crankcase breathing, a low-pressure fuel return system and a baffled oil sump, to prevent engine lubricant cavitation at high engine speeds and high-G cornering. It has four valves per cylinder (instead of five on the earlier variant) and two overhead camshafts on each cylinder bank (making it "quad cam"), which are driven by roller chains with variable valve timing[11] for both inlet and exhaust camshafts,[7] along with a cast magnesium alloy fixed tract length intake manifold with adjustable tumble flaps (to improve low engine speed combustion). On 98RON (93AKI) Super-Unleaded petrol it produces 309kW (420PS; 414bhp) at 7,800rpm,[7] giving it a specific power output of 74.2kW (100.9PS; 99.5bhp) per litre.[8] Based on a kerb weight of 1,680kg (3,704lb), this results in a power-to-weight ratio of 0.184kW per kg. Exhaust gas escapes through two '4-into-2-into-1' fan-branch steel exhaust manifolds and four high-flow catalytic converters,[7] into twin oval tail pipes with dynamic silencer/muffler valves. The engine is controlled by two Bosch DI-Motronic[12] 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.[7] The saloon version produces 322-329grams of CO2 per kilometre (g/km),[7] and the Avant starts from 324g/km.
A 6-speed Getrag manual transmission[7][8] is the only transmission available. The gear ratios are 1st: 3.667, 2nd: 2.211, 3rd: 1.520, 4th: 1.133, 5th: 0.919, 6th: 0.778.[7]
The Audi B7 RS 4 was the only "RS" Audi powered by a naturally aspirated engine until the Audi RS 5 was presented at the 2010 Geneva Motor Show.
quattro
Another focus of the B7 RS 4 was on the introduction of the latest development of Audi's quattro permanent four-wheel drive system.[7][8] This utilized the 'third generation' asymmetric/dynamic[8]Torsen[7][8] 'automatic torque biasing' centre differential, featuring a 'default' 40:60 front-to-rear torque split under normal conditions. Audi stressed that this would result in a more neutral response in corners and a more dynamic driving experience. Also, a more aggressive Torque Bias Ratio (TBR) was used, and set to 4:1, as opposed to 2:1 (and later variants 3:1 TBR) on standard A4.[13] 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.[7]
Traction is assisted by way of "Electronic Differential Lock" (EDL),[7][8] which monitors the rotational speeds of the left and right wheels across an individual axle, and if one wheel should rotate faster than the other (exceeding the pre-defined parameters), indicating loss of traction, or "wheel spin" on one wheel, the EDL applies the brakes to that individual spinning wheel,[7] and thus results in transferring torque across the open differential to the wheel on the other side deemed to have grip, hence traction.
B7 suspension and steering
Audi B7 RS 4
The B7 RS 4 also incorporates Audi's "Dynamic Ride Control"[8] "Sports Suspension"[8] mechanism. The dampers/shock absorbers are made for Audi by KW, and central reservoirs/valves made by KYB.
In the RS 4 suspension, a fluid hydraulic linkage between diagonally opposing front and rear suspension dampers (left front to right rear, and vice versa) is used to counteract vehicle pitch and roll.[8] Lightweight magnesium/aluminium alloy multi-link suspension arms (four arm with virtual steering axis up front,[7] and trapezoidal arm with unequal length track control arms at the rear)[7][8] locate each wheel in a controllable fashion, whilst minimising unsprung masses. Hollow tubular anti-roll bars are standard front and rear.[7] Compared to standard [B7 A] models, the RS 4 features a 30mm (1.2in) lower ride height.[8] An optional "Sports Suspension Plus"[8] lowers the car by a further 10mm (0.4in), and marginally further stiffens the damper rates.
Axle track has also been increased over standard A4s; the front widened by 37mm (1.5in),[8] to 1,559mm (61.4in)[7] and the rear by 47mm (1.9in)[8] to 1,569mm (61.8in).[7]
B7 brakes, wheels and tyres
The standard brakes[7][8] on the RS 4 are of two-piece construction. The cast-iron discs are cross-drilled and radially ventilated and float on aluminium alloy disc hubs. The two-piece disc construction reduces unsprung mass and also reduces the transmission of heat generated by the brakes to the wheel bearings. The front discs are 365mm (14.4in) in diameter and 34mm (1.34in) thick with Brembo monoblock eight-piston fixed calipers.
The rear brakes[8] are drilled, vented and floating 324mm (12.8in) by 22mm (0.87in) iron discs with single piston floating calipers and an integrated mechanical handbrake mechanism.
A lighter and more performant "Audi ceramic" front brake system was an option from 2007 model year onwards (and only with 19inch wheels). It comprised cross-drilled, radially vented and floating Carbon fibre-reinforced Silicon Carbide composite SGL Carbon discs, 380mm (15.0in) diameter and 38mm (1.50in) thick, with grey Brembo monoblock six-piston fixed aluminium calipers.
In the UK and Japan, the standard wheels are 19inch alloy wheels (9Jx19" ET29 "7-arm double spoke") with 255/35 ZR19 96Y XL tyres.[8] This 19" wheel and tyre package was an option for the North American,[8] and some European markets.
B7 crash testing
The North American Insurance Institute for Highway Safety (IIHS) crash-tested the B7 RS 4's sibling, the B7 A4, and awarded it "Double Best Pick" for frontal and side crashes—beating rivals such as the BMW 3 Series, the Mercedes-Benz C-Class, however at the 2012 session of the SOT (small overlap test) the A4 was rated Poor, rating applying up to the 2016 MY. () [14]
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).[15]
B8 (Typ 8K, 2012–2015)
This section needs expansion. You can help by adding to it. (June 2015)
The Audi RS 4 Avant quattro was unveiled at the 2012 Geneva Motor Show and was based on the B8 A4 Avant.[17] 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. A completely remodelled front bumper cover with honeycomb grill compared to the standard A4 and S4 as well as remodelled rear bumper with honeycomb detailing and minor air diffuser.
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 450PS (450PS; 444hp) and 430N⋅m (317lbf⋅ft) allowing the car to accelerate from 0–60mph (0–97km/h) in 4.7seconds. 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, 365mm (14.4in) diameter and 34mm (1.34in) thick, with 6-piston Brembo floating calipers, and at the rear 330mm (13.0in) by 22mm (0.87in) discs with a single-piston floating caliper.
The standard wheels were 19inch with 235/40R19 Pirelli P-Zero tyres. Optional 20" rotor design or 10 spoke alloy wheels were also available with 265/35 R20 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.[citation needed]
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 paint exterior. It retailed at approximately 10% more than the standard model.
Some ~200 were manufactured with approximately 39 in RHD being registered in the UK.
The new RS 4 Avant was unveiled at the 2017 Frankfurt Motor Show. Noticeable changes include a more angular exterior and newly designed wheels. The new RS 4 Avant is powered by a 2.9 TFSI V6 twin-turbo engine producing 450PS (331kW; 444bhp) and 600N⋅m (443lbf⋅ft) of torque. This means that the new 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.
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.
Rear
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.[19]
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.
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