View source for Audi S4

{{Use dmy dates|date=May 2020}}{{Infobox automobile
| name = Audi S4
| image = 2018 Audi S4 3.0T Premium Plus in Daytona Gray Pearl, front right.jpg
| caption = Audi S4 (B9) sedan (front view, United States)
| manufacturer = [[Audi AG]]
| aka = 
| production = {{hlist|1991–1994<br/>1997–2025}}
| class = [[Compact executive car]] ([[D-segment|D]])
| layout = [[F4 layout]]
| related = [[Audi A4]]<br>[[Audi RS 4]]
| sp = uk
}}
The '''Audi S4''' is the [[Sports sedan|high performance]] variant of [[Audi]]'s [[compact executive car]] [[Audi A4|A4]]. The original Audi S4, built from 1991 until 1994, was a performance-oriented version of Audi's [[Audi 100|100]] [[sedan (automobile)|saloon/sedan]]. All subsequent S4s since 1997 have been based on the [[Audi A4]]; and as the A4 has evolved from one generation to the next, so has the S4.

Like its regular A4 counterpart, all S4 variants have had [[longitudinal engine|longitudinally oriented]], [[Front-engine, front-wheel-drive layout|front-mounted]] engines. All versions of the S4 have their [[transmission (mechanics)|transmission]] mounted immediately at the rear of the engine in a longitudinal orientation, in the form of a [[transaxle]], and like all [[Audi S and RS models#S models|Audi "S" cars]], are only available as standard with Audi's [[quattro (four wheel drive system)|quattro]] all-wheel drive (AWD) system, using a [[Torsen]]-based centre differential system.<ref name="ETKA">[[ETKA]] official factory data{{Clarify|date=April 2010|reason=This is not a proper reference citation. Use [[Cite web]] or similar to provide source details.}}</ref> A more powerful [[internal combustion engine]], larger upgraded brakes, firmer [[suspension (vehicle)|suspension]], larger wheels, and distinctive sheetmetal, styling cues and badging have always been amongst the many upgrades the S4 receives over its mainstream 100 and A4 siblings. In markets where the even higher-performance [[Audi RS 4]] is not offered, the S4 is the top-of-the-line trim of the A4 family.<ref name="nytimes1">{{cite news|last=Dyer |first=Ezra |url=https://www.nytimes.com/2010/03/14/automobiles/autoreviews/14audi-s4.html |title=Behind the Wheel - 2010 Audi S4 - Less Motor, More Grip, and It All Makes Sense - Review |work=nytimes.com |date=2010-03-11 |access-date=2010-03-21| archive-url= https://web.archive.org/web/20100318033151/http://www.nytimes.com/2010/03/14/automobiles/autoreviews/14audi-s4.html| archive-date= 18 March 2010 | url-status= live}}</ref><ref>AudiWorld.com [https://www.audiworld.com/model/s4/content.shtml North American S4 Model Guide] - historical S4 specifications, prices, and options</ref>

A single [[turbocharger|turbocharged]] 2.2-litre [[straight-five engine|inline five-cylinder]] powered the original C4 version, and a 2.7-litre twin [[turbocharger|turbocharged]] [[V6 engine]] was found in the B5 generation. The B6 and B7 versions shared a common 4.2-litre [[V8 engine]], the first time that a V8 engine was placed in a compact executive car, placing it in direct competition with the [[E46 M3|BMW M3]] (3.2 L [[inline 6]]) and [[Mercedes-Benz C-Class (W203)|Mercedes-Benz C32 AMG]] (3.2-litre supercharged V6). The B8 generation uses a [[supercharger|supercharged]] 3.0-litre V6 TFSI engine and competed with the [[BMW 3 Series (E90)|BMW 335i]], [[BMW 3 Series (F30)|BMW 335i/340i xDrive]], and [[Mercedes-Benz C-Class (W204)|Mercedes-Benz C350]].<ref name="nytimes1" /> The current B9 generation is powered by a turbocharged 3.0-litre V6 TFSI engine, with rivals including the [[BMW 3 Series (G20)|BMW M340i xDrive]] and [[Mercedes-Benz C-Class (W205)|Mercedes-Benz C450 AMG/Mercedes-AMG C43 4MATIC]].<ref>{{Cite web|url=https://www.audiusa.com/models/audi-s4|title = Audi}}</ref><ref>{{Cite web|url=http://www.motortrend.com/cars/audi/s4/2018/2018-audi-s4-s5-first-drive-review/|title = 2018 Audi S4 and S5 First Drive Review: S is for "Smoove"|date = 24 April 2017}}</ref>

All versions of the S4 have been manufactured at [[list of Volkswagen Group factories|Audi's plant]] in [[Ingolstadt]], Germany; they are, or have been available as a four-door five-seat saloon and a five-door five-seat Avant (Audi's name for an [[station wagon|estate car/station wagon]]) [[car body style|body styles]] since the model's inception in 1991. A two-door four-seat Cabriolet ([[convertible (car)|convertible]]) S4 variant was introduced as part of the B6 and B7 generation A4 lineups. The B8 Cabriolet has now been built off the A5 coupe body style and the "S" variant is marketed under the [[Audi S5]] nameplate.

=={{anchor|C4|4A}}C4 (''Typ'' 4A, 1991–1994)==
{{Infobox automobile
|name             = First generation (C4/4A)
|image            = 1st-Audi-S4.jpg
|aka              = ''"Ur-S4"''
|production       = August 1991–July 1994<ref name="ETKA"/>
|assembly         = Germany: [[Neckarsulm]]
|successor        = [[Audi S6#C4|Audi C4 S6]], [[#B5|Audi B5 S4]]
|body_style       = 4-[[vehicle door|door]] [[sedan (automobile)|saloon/sedan]]<br />5-door [[Station wagon|estate/wagon]] (Avant)
|platform         = [[Volkswagen Group C platform#C4|Volkswagen Group C4]]
|engine           = {{ubl
  | 2.2&nbsp;L ''[[List of discontinued Volkswagen Group petrol engines#AAN|AAN]]'' [[Multi-valve|20V]] [[DOHC]] [[Turbocharger|turbo]] [[Straight-five engine|I5]] <small>(08/91-07/94)</small><ref name="ETKA"/>
  | 4.2&nbsp;L ''[[List of discontinued Volkswagen Group petrol engines#ABH|ABH]]'' 32V DOHC [[V8 engine|V8]] <small>(10/92-07/94)</small><ref name="ETKA"/>
  }}
|transmission     = 5-speed [[manual transmission|manual]]<br />6-speed manual<br />4-speed [[automatic transmission|automatic]]<ref name="ETKA"/>
|wheelbase        = {{convert|2692|mm|1|abbr=on}}
|length           = {{convert|4790|-|4982|mm|1|abbr=on}}
|width            = {{convert|1803|mm|1|abbr=on}}
|height           = {{convert|1443|mm|1|abbr=on}}
|weight           = saloon: {{convert|1730|kg|0|abbr=on}}<br />estate: {{convert|1780|kg|0|abbr=on}}
|related          = [[Audi 100#C4|Audi C4 100]]<br />[[Audi A6#C4|Audi C4 A6]]<br />[[Audi S6#C4|Audi C4 S6]]
|designer         =
|sp               = uk
}}
{{See also|Audi S6#C4}}
Factory production of the original Audi S4 ('''''Typ'' 4A'''), usually known as '''Audi 100 S4''', began in August 1991 to serve as the performance version of the newly updated, [[Volkswagen Group C platform#C4|C4]] platform, [[Audi 100#C4|100-series]] four-door, five-seat saloon. First shown to the public at the May 1991 [[Automobile Barcelona|Barcelona Show]], it was designed to replace the outgoing [[Volkswagen Group C platform#C3|C3]]-based Audi 200 turbo quattro 20V and retained its five-cylinder engine.<ref name="TV1291.16">{{cite magazine | ref = AS91 | title = Toledo och S4 i Barcelona | trans-title = Toledo and S4 in Barcelona | language = sv | magazine = [[Teknikens Värld]] | publisher = Specialtidningsförlaget AB | location = Stockholm, Sweden | page = 16 | date = 1991-06-13 | issue = 12 | volume = 43 | editor-first = Claes | editor-last = Johansson }}</ref> The 200, Audi's first true sports-saloon, had been discontinued at the end of 1990.<ref>{{cite magazine|title=Preview: Audi S4| first = Stephen L. | last = Thompson|magazine=[[Car and Driver]]| date=March 1992|pages=79–80}}</ref><ref>{{cite magazine |title=Magnum Force| first = Rodrigo | last = Gato | magazine = [[Car and Driver]]| date = April 1992|pages=47–56}}</ref> Being the first S4 model from Audi, it is commonly referred to as the ''Ur-S4'', derived from the {{langx|de|'''Ur'''sprünglich}} augmentive word (meaning: original).

[[File:Audi S4 Avant (C4).jpg|left|thumb|Audi S4 Avant (C4)]]
Audi mildly updated the C4-based model line in 1994 and dropped the 100 nomenclature; all variants of the former Audi 100 line were now [[badge engineering|re-badged]] as the [[Audi A6]]. In line with the switch in model name, Audi temporarily discontinued the use of the S4 name and began selling an updated but fundamentally identical version of the car, based on the "new" A6 and badged as '''[[Audi S6|S6]]'''. Despite the change in name, differences between the outgoing S4 and incoming S6 were cosmetic and very light.

An all-new [[Volkswagen Group C platform#C5|C5]]-based Audi A6 debuted for 1997, after which the S4 and S6 became distinctly separate models based on very different [[list of Volkswagen Group platforms|platforms]].

The C4 variant S4 ended factory production after less than three years in July 1994.<ref name="ETKA"/>

One of its most renowned owners was [[Ayrton Senna]] who owned a silver Avant,<ref>{{cite news|title=Senna: aceleramos os carros do campeão|url=http://caranddriverbrasil.uol.com.br/carros/carros/especial/senna-aceleramos-os-carros-do-campeao/8013|publisher=Car and Driver (Portugal)|date=11 June 2014|access-date=9 February 2015|language = pt | archive-url=https://web.archive.org/web/20150208181855/http://caranddriverbrasil.uol.com.br/carros/carros/especial/senna-aceleramos-os-carros-do-campeao/8013|archive-date=8 February 2015|url-status=dead}}</ref> not least because he was the Audi distributor for Brazil.

===C4 powertrain===
In standard form, the powertrain detail of the C4-based S4 was available with only one engine, a single [[turbocharger|turbocharged]] and [[intercooler|intercooled]] version of Audi's 2.2-litre [[multi-valve|20-valve]] [[straight-five engine|inline five-cylinder engine]] This displaced {{convert|2226|cc|1|abbr=on}} and was equipped with an advanced [[Robert Bosch GmbH|Bosch]] [[Motronic]] electronic [[engine control unit]] (ECU).<ref name="ETKA"/> This engine (parts code prefix: 034, identification code: [[list of discontinued Volkswagen Group petrol engines#AAN|AAN]]), developed a motive power output of {{cvt|230|PS|kW PS bhp|0|order=out}} at 5,900&nbsp;rpm and {{convert|350|Nm|0|abbr=on}} of torque at 1,950&nbsp;rpm.<ref name="ETKA"/> With the five-speed manual transmission, it was able to accelerate from 0-{{convert|100|km/h|mph|0|abbr=on}} in 6.2&nbsp;seconds.

Both five- and six-speed [[manual transmission]]s (parts code prefix: 01E, identification codes: five-speed: CBD, CET, six-speed: CBL, CMG) were offered to European customers, but a five-speed manual was the only transmission available in North America; a four-speed [[automatic transmission]] (parts code prefix: 01F, identification code: CBF) was available as an option worldwide.<ref name="ETKA"/> Front and rear axle final drive [[gear ratio|ratio]] is either 4.111 or 3.889 (dependent on transmission type), and the rear axle (parts code prefix: 017, identification codes: AAT, AET) uses a driver-selectable electro-pneumatic-mechanical switchable [[locking differential|diff lock]].<ref name="ETKA"/>

Audi's [[quattro (four wheel drive system)|quattro]] four-wheel-drive system was standard on the C4 S4/S6; a first-generation [[Torsen]]-based system which used the "T-1" automatically biasing centre differential (ATB) was used.

S4/S6 models equipped with a 4.2-litre {{convert|206|kW|PS bhp|0}} all-aluminium alloy [[V8 engine]] (parts code prefix: 077, identification code: [[list of discontinued Volkswagen Group petrol engines#ABH|ABH]]) became available to European customers as an option from October 1992, only with the six-speed manual gearbox, in either saloon or Avant body styles.<ref name="ETKA"/>

===C4 steering, brakes, wheels & tires===
[[File:Audi S4 C4 Innenraum.jpg|thumb|C4 S4 interior]]
All C4 S4s' came equipped as standard with a conventional fixed-assistance rack and pinion [[power steering|power assisted steering]] (PAS) system. An electronically controlled '[[servotronic]]' system, which varied the level of assistance in accordance with the road speed, was available as an option.<ref name="ETKA"/>

There were two different types of high performance brake systems on offer for the C4 S4.<ref name="ETKA"/> All S4s' initially had {{convert|310|mm|2|abbr=on}} diameter by {{convert|25|mm|3|abbr=on}} thick, radially ventilated [[disc brake]]s up front, each with an [[Continental AG|ATE]] single-piston sliding caliper inside a 'UFO' styled bell-shaped disc. With the introduction of the V8 engine, a new front brake setup became standard; again the discs used radial ventilation, but these front discs were now sized at {{convert|314|mm|2|abbr=on}} by {{convert|30|mm|3|abbr=on}} - with a conventionally mounted [[LucasVarity|Lucas]]-[[Lucas Industries#Girling|Girling]] caliper in an external position over the disc. US models had smaller {{convert|276|mm|2|abbr=on}} discs. The rear brakes, {{convert|269|mm|2|abbr=on}} by {{convert|20|mm|3|abbr=on}} and also radially ventilated - remained the same throughout C4 production; they used a Lucas-Girling single-piston sliding caliper with an integrated cable-actuated handbrake mechanism. A [[Robert Bosch GmbH|Bosch]] three-channel operation (four-channel sensing) [[anti-lock braking system|Anti-lock Braking System]] (ABS) with a mechanical load sensing valve for the rear brakes was standard throughout production.<ref name="ETKA"/>

For wheel options, the standard five-arm "Fuchs" forged alloy wheels were 8.0Jx16H2&nbsp;ET40, and were fitted with 225/50&nbsp;R16 [[tire code|sized]] tyres. Several other tyre and wheel designs were optionally available: a 7.5Jx15H2&nbsp;ET40 six-spoke with 215/60&nbsp;R15 tyres, an 8.0Jx16H2&nbsp;ET40 five-double-spoke, a 7.5Jx16H2&nbsp;ET35 six spoke "Avus", and an 8.0Jx17H2&nbsp;ET40 ten-spoke.<ref name="ETKA"/>

==B5 (''Typ'' 8D, 1997–2002)==
{{Infobox automobile
| name = Second generation (B5/8D)
| image = Audis4avant b5.jpg
| aka = 
| production = October 1997–September 2001<ref name="ETKA"/>
| assembly = Germany: [[Ingolstadt]]
| body_style = 4-door [[sedan (automobile)|saloon/sedan]]<ref name="ETKA"/><br />5-door [[station wagon|estate/wagon]] (Avant)<ref name="ETKA"/>
| platform = [[Volkswagen Group B platform#B5|Volkswagen Group B5]]
| related = [[Audi A4#B5|Audi B5 A4]]<br>[[Audi RS4#B5|Audi B5 RS4]]
| engine = 2.7&nbsp;L [[V6 engine|V6]] [[multi-valve|30v]] [[DOHC]] '[[twin-turbo|biturbo]]'<ref name="ETKA"/>
| transmission = 6-speed [[manual transmission|manual]],<ref name="ETKA"/><br />5-speed [[ZF Friedrichshafen|ZF]] [[ZF 5HP19 transmission#5HP19FLA|5HP19]] [[tiptronic]] [[automatic transmission|automatic]]<ref name="ETKA"/>
| wheelbase = {{convert|2615|mm|1|abbr=on}}
| length = {{convert|4483|mm|1|abbr=on}}
| width = 1997-99: {{convert|1733|mm|1|abbr=on}}<br />2000-02: {{convert|1848|mm|1|abbr=on}}
| height = saloon: {{convert|1396|mm|1|abbr=on}}<br />Avant: {{convert|1418|mm|1|abbr=on}}
| weight = {{convert|1535|kg|0|abbr=on}} to<br />{{convert|1680|kg|0|abbr=on}}
| sp = uk
| predecessor = Audi C4 S4
| successor = Audi B6 S4
}}
[[File:Audi-S4-Avant-1.jpg|thumb|left|Audi B5 S4 Avant]]
[[File:Audi S4 B5 blue rear.jpg|left|thumb|Audi B5 S4 sedan]]
The second generation S4 ('''''Type'' 8D'''), also known as the '''Audi S4 quattro''' debuted in 1997, with factory production commencing October 1997,<ref name="ETKA"/> as part of the facelifted [[Volkswagen Group B platform#B5|B5 platform]] [[Audi A4#B5|Audi A4]] line-up, although it was not available in North America until late 1999.

In addition to the [[sedan (automobile)|saloon]] (sedan), an [[station wagon|estate]] version (wagon)–the Audi S4 Avant–was introduced into the lineup from 1998. Production of the B5 S4 ceased in September 2001,<ref name="ETKA"/> although it was still sold together with the next B6 platform generation through 2002 in North America. Examples produced June 2001 to end of production are 2002 Model Year cars, the 10th digit of the VIN being the number "2".

===B5 powertrain===
The powertrain details<ref name="ETKA"/> of the B5 S4 feature a 2.7-litre [[twin-turbo]] ('biturbo') 90° third-generation [[V6 engine]] (parts code prefix: 078, identification codes: [[list of discontinued Volkswagen Group petrol engines#B5S4|AGB, AZB, APB]]). Details of the powerplant include a [[cast iron]] [[cylinder block]] with two lightweight aluminium alloy [[cylinder head]]s. The [[valvetrain]] includes 30 valves (five valves per cylinder),<ref>Audi Self-Study Programme SSP198 - The 2.7-litre V6 biturbo</ref><ref>Audi.com - Glossary [http://www.audi.com/audi/com/en2/tools/glossary/engine_driveline/five_valves_per_cylinder.html five valves per cylinder] {{Webarchive|url=https://web.archive.org/web/20080622022447/http://www.audi.com/audi/com/en2/tools/glossary/engine_driveline/five_valves_per_cylinder.html |date=22 June 2008 }}</ref> twin hybrid-driven ([[timing belt (camshaft)|timing belt]] and roller chain) [[double overhead camshaft]]s and [[variable valve timing]] for the inlet valves. The intake air is pressurized by two [[Twin-turbo#Parallel twin-turbo|parallel]] water-cooled [[BorgWarner]] K03-series turbochargers; the charged air is cooled by two side-mounted air-to-air [[Intercooler#Charge air cooler|intercoolers]] (SMICs). It displaces {{convert|2671|cc|1}}, and is rated to produce a motive power output of {{convert|195|kW|PS bhp|0|abbr=on}} at 5,800&nbsp;rpm, and generates {{convert|400|Nm|0|abbr=on}} of torque at 1,850&nbsp;rpm. Engine management was by way of a [[Robert Bosch GmbH|Bosch]] [[Motronic]] ME&nbsp;7.1 (7.0 in North America) electronic [[engine control unit]] (ECU), and helped it meet the European EU-3D emissions standard. In all US-market cars, the engine was detuned to meet US emissions regulations; output was reduced to {{convert|184|kW|PS hp|0|abbr=on}} and {{convert|350|Nm|0|abbr=on}} (identification code: APB).

As in the previous S4, a six-speed C90 [[manual transmission]] (parts code prefix: 01E, identification code: DSY, [[gear ratio]]s: 1st: 3.500, 2nd: 1.889, 3rd: 1.231, 4th: 0.967, 5th: 0.806, 6th: 0.684) was standard equipment, as was the [[Torsen]] T-2 [[quattro (four wheel drive system)|quattro]] permanent [[all-wheel drive]] system. Final drive (parts code prefix: 01H, identification code: DQA) ratio is 4.111. A five-speed [[ZF Friedrichshafen|ZF]] [[ZF 5HP19 transmission#5HP19FLA|5HP19]] [[tiptronic]] [[automatic transmission]] (parts code prefix: 01V) became available for the first time as an option.<ref name="ETKA"/>

The B5 S4 claims acceleration from {{convert|0|to|100|km/h|abbr=on|0}} in 5.7&nbsp;seconds, and has an electronically limited top speed of {{convert|250|km/h|mph|0|abbr=on}}, which made it both the quickest saloon/sedan in the Audi model line, and among the quickest saloon/sedans in the world at that time.{{Citation needed|date=May 2020}}

===B5 suspension, brakes, wheels & tires===
The B5 S4 is fitted with 4-wheel [[independent suspension]]. The front suspension is a [[multi-link suspension|multi-link]] design with four individual [[control arm]]s per wheel. The rear suspension is an [[short long arms suspension|unequal length]] [[double wishbone suspension|double wishbone]] design; the lower control arms are mounted to a [[subframe]] which also carries the differential housing. [[Shock absorbers]], [[coil springs]], and [[anti-roll bars]] are fitted front and rear.

The B5 S4 brake system<ref name="ETKA"/> consisted of radially ventilated discs, {{convert|321|mm|2|abbr=on}} in diameter by {{convert|30|mm|2|abbr=on}} thick up front, and {{convert|256|mm|2|abbr=on}} by {{convert|22|mm|2|abbr=on}} at the rear. Two-piston [[LucasVarity|Lucas]] HP2 brake calipers at the front (with four pads per caliper), with Lucas single-piston sliding brake calipers at the rear. A [[Robert Bosch GmbH|Bosch]] ABS&nbsp;5.3 four-channel [[anti-lock braking system|Anti-lock Braking System]] (with [[electronic brakeforce distribution|Electronic Brakeforce Distribution]] (EBD) and Electronic Differential Lock (EDL) - and later with ESP or [[electronic stability control|Electronic Stability Programme]]), coupled with a [[vacuum servo]] completed the system.

Standard wheels<ref name="ETKA"/> were Audi's die-cast aluminium alloy six-arm 'Avus' 7.5Jx17H2&nbsp;ET45 wheels, fitted with 225/45&nbsp;ZR17 performance tyres.

===B5 colors & optional equipment===
[[File:Audi S4 B5 Interior.jpg|thumb|B5 S4 interior]]
Available exterior colors included Brilliant Black, Laser Red, Light Silver, Cactus Green, Santorin Blue, Hibiscus Red, Casablanca White, Pearlescent White, Imola Yellow (''spicy mustard''), and Nogaro Blue. The last two colors were exclusive to the S4 model. Interior leather was available in Onyx or Silver. Available options included:
* [[Bose Corporation|Bose]] premium sound system
* Audi Navigation System
* 6-disc CD changer
* Hands free Motorola cellular telephone
* Premium Package: Sunroof, HomeLink transmitter, auto dimming mirrors
* Cold Weather Package: heated front seats, heated outside mirrors, expandable ski sack
* Enhanced Sport Package: [[Alcantara (material)|Alcantara]] seat inserts, silver aluminum belt line trim or carbon fibre trim (on late 2000-2001 models), Aluminum mirror housings (on 2001 & 2002 models)

The Sport Package replaced the wood-grain belt line trim with silver aluminum trim, and the wood grain finish around the shifter with black plastic. The [[Alcantara (material)|Alcantara]] seat inserts were silver (on Onyx leather). With the black, white, or blue exteriors, the inserts were also available in blue Alcantara. On the early 2000 models, the Alcantara inserts in the rear seats did not fully extend forward to the front edge of the seat.

===B5 motorsport===
A motor racing version of the car achieved great success in the [[SPEED World Challenge|SpeedVision World Challenge]] with Michael Galati taking the 2001 SpeedVision GT title in a [[Champion Racing]] S4, winning four races, and helping Audi to its first Manufacturers' Championship.

The [[Audi Sport]] specification Champion A4 chassis included a [[Audi RS4#B5|B5 RS4]] engine, and [[Alcon Component Limited|Alcon]] racing [[brake caliper]]s (4 piston front and 2 piston rear calipers).{{-}}

Don Istook, with Istook's Motorsports, built and campaigned several B5 S4's in first the Motorola Cup, and then the Grand Am Cup. The S4's were even raced by Istook's Motorsports in the Rolex GT category for several races to help fill the field. Of note, one of the S4's, racing against true GT cars, even ran as high as second place (in the rain) at Barber Motorsports Park.{{Citation needed|date=November 2018}} These S4's were built using existing S4, not RS4 engines, but used the B5 Audi RS4 K04 turbochargers.

==B6 (''Typ'' 8E/8H, 2003–2005){{anchor|B6|8E|8H}}==
{{Infobox automobile
| name = Third generation (B6/8E/8H)
| image = Audi S4 Cabriolet - Flickr - The Car Spy (23).jpg
| aka = 
| production = Mar 2003–Dec 2004<br />Feb 2004–Dec 2005 (Cabrio)<ref name="ETKA"/>
| assembly = Germany: [[Ingolstadt]] (Sedan & Avant) <br />Germany: [[Rheine]] ([[Karmann]]: Cabriolet)
| predecessor = Audi B5 S4
| successor = Audi B7 S4
| body_style = 4-door [[sedan (automobile)|saloon/sedan]],<ref name="ETKA"/><br />5-door [[station wagon|estate/wagon]] (Avant),<ref name="ETKA"/><br />2-door [[Convertible (car)|cabriolet]]<ref name="ETKA"/>
| platform = [[Volkswagen Group B platform#B6|Volkswagen Group B6 (PL46)]]
| engine = 4.2&nbsp;L [[V8 engine|V8]] [[multi-valve|40v]] [[DOHC]]<ref name="ETKA"/>
| transmission = 6-speed [[Getrag]] [[manual transmission|manual]],<ref name="ETKA"/><br />6-speed [[ZF Friedrichshafen|ZF]] [[ZF 6HP19 transmission|6HP19]] [[tiptronic]] [[automatic transmission|automatic]]<ref name="ETKA"/>
| wheelbase = {{convert|2651|mm|1|abbr=on}},<br />Cabrio: {{convert|2654|mm|1|abbr=on}}
| length = {{convert|4575|mm|1|abbr=on}},<br />Cabrio: {{convert|4573|mm|1|abbr=on}}
| width = {{convert|1781|mm|1|abbr=on}},<br />Cabrio: {{convert|1778|mm|1|abbr=on}}
| height = {{convert|1415|mm|1|abbr=on}},<br />Cabrio: {{convert|1391|mm|1|abbr=on}}
| weight = saloon: {{convert|1660|kg|0|abbr=on}}<br />estate: {{convert|1720|kg|0|abbr=on}}<br />cabriolet: {{convert|1855|kg|0|abbr=on}}
| related = [[Audi A4#B6|Audi B6 A4]]
| designer = 
| sp = uk
}}
[[File:Audi b6 s4 2005 rear.png|thumb|left|2003–2005 S4 (B6) saloon (US)]]
[[File:2005 Audi S4 Avant quattro, rear left (ISWC meet, July 15, 2023).jpg|thumb|left|[[model year|MY]]2005 Audi S4 (B6) Avant (US)]]
[[File:Audi S4 Cabriolet - Flickr - The Car Spy (15).jpg|thumb|left|Audi S4 Cabriolet (UK)]]

The third generation '''Audi S4 quattro''' ('''''Type'' 8E'''&nbsp;— saloon: 8E2, Avant: 8E5, and Cabriolet: 8H7) debuted its saloon and Avant bodystyles in Europe in March 2003,<ref name="ETKA"/> and appeared in North America slightly later.{{When|date=June 2009}} This was based on the latest [[Volkswagen Group B platform#B6|Volkswagen Group B6 (PL46) platform]] used by the then current [[Audi A4#B6|Audi B6 A4]]. Despite having moved to an entirely new platform, one of the S4's most publicised new features was its new engine - a 4.2-litre [[V8 engine]]. Following its initial launch of either a four-door five-seat saloon (sedan), or a five-door five-seat Avant (estate/wagon), it eventually became available in three bodystyles - and for the first time in the [[Audi S and RS models#S models|Audi 'S' car range]], from February 2004, a two-door four-seat Cabriolet ([[convertible (car)|convertible]]), '''''Type'' 8H''', was included in the [[model range]].<ref>Audi Technical Data sheets - 2003 S4 quattro - saloon, Avant, and Cabriolet</ref>

Official performance figures for 0-{{convert|100|km/h|0|abbr=on}} in the saloon with the manual transmission are 5.6&nbsp;seconds (Avant 5.8&nbsp;s, Cabriolet 5.9&nbsp;s), however, a road test conducted by the American automotive magazine ''[[Motor Trend]]''<ref>{{cite web|url=http://www.motortrend.com/roadtests/sedans/112_0308_sports_car_comparison/specs_price.html |title=Sports Car Comparison: 2004 Audi S4 vs. 2003 Mercedes-Benz C32 AMG |publisher=Motortrend.com |date=2007-02-26 |access-date=2010-10-01}}</ref> indicated that it could go from a 0-{{convert|60|mph|0|abbr=on}} in less than 5&nbsp;seconds, and make it to {{convert|200|km/h|0|abbr=on}} in slightly over 20&nbsp;seconds, although doing this led to fuel consumption dipping into single digits. This was considerably worse than the earlier V6 models, leading to the addition of a $1,700 [[Gas Guzzler Tax|gas guzzler tax]] (combined {{convert|20.2|mpgus|L/100 km mpgimp}}) for the six-speed manual sedan in the United States. Top speed is electronically limited to {{convert|250|km/h|0|abbr=on}}.

The B6 S4 saloon and Avant variants ceased factory production in December 2004, with the Cabriolet ending twelve months later at December 2005.<ref name="ETKA"/>

===B6 powertrain===
Replacing the 2.7-litre '[[twin-turbo|biturbo]]' [[V6 engine]] of the previous generation B5 S4, the new B6 S4 powertrain<ref name="ETKA"/> gained an all-aluminium alloy 4.2-litre, 40 valve (five valves per cylinder) [[V8 engine]] (parts code prefix: 079.C, identification code: [[list of Volkswagen Group petrol engines#B6S4|BBK]]), with flywheel-end chain-driven [[double overhead camshaft]]s, roller-finger [[rocker arm]] [[cam follower]]s, and included [[variable valve timing|variable inlet camshaft timing]]. It also used a strengthened alloy [[crankshaft]] bedplate for the five [[main bearing]]s, and a two-part [[baffle (in vessel)|baffle]]d oil sump, and a light-alloy [[variable length intake manifold|variable intake manifold]] (VIM), containing the fractionally sequentially actuated [[fuel injection|fuel injectors]]. This petrol engine, based on the unit from the [[Audi A8]], displaces {{convert|4163|cc|1|abbr=on}}, and it produces a motive power output of {{convert|344|PS|kW bhp|0|abbr=on}} at 7,000&nbsp;rpm, and generates torque of {{convert|410|Nm|0||abbr=on}} at 3,500&nbsp;rpm, making it more powerful than the [[Audi RS2 Avant|RS2 Avant]], and nearly as powerful as the [[Audi RS4#B5|B5 RS4]]. Engine management was handled by a [[Robert Bosch GmbH|Bosch]] [[Motronic]] ME&nbsp;7.1.1 electronic [[engine control unit]] (ECU), using a Bosch 'E-Gas' [[drive by wire]] electronic throttle, and powering eight individual [[ignition coil|spark coils]] with longlife quad-electrode Bosch spark plugs. [[Ignition timing]] is a mapped direct ignition, with cylinder-selective knock control with the aid of four knock sensors. The exhaust system includes vacuum-operated valves in the twin rear [[muffler|silencers]] (mufflers), finished with [[chrome plating|chrome plated]] tail-pipes.

Like its predecessors, the B6 S4 was standard with a [[Getrag]] six-speed (M6S) manual transmission (parts code prefix: 0A3, identification codes: FVD, HEP) ([[gear ratio]]s - 1st: 3.667, 2nd: 2.050, 3rd: 1.462, 4th: 1.133, 5th: 0.919, 6th: 0.778),<ref name="ETKA"/> with a {{convert|240|mm|in|1|abbr=on}} single plate dry [[clutch]], and [[Torsen]] T-2 [[quattro (four wheel drive system)|quattro]] permanent [[four-wheel drive]] system. Final drive (parts code prefix: 01R, identification code: EXZ) ratios are 3.889,<ref name="ETKA"/> giving a top gear road speed to engine revs ratio of {{convert|24.4|mph|1}} per 1000&nbsp;rpm. From July 2003,<ref name="ETKA"/> the [[ZF 6HP19 transmission|ZF 6HP19]] [[tiptronic]] [[automatic transmission]] (parts code prefix: 09L, identification codes: GUR, HHU) (ratios - 1st: 4.171, 2nd: 2.340, 3rd: 1.521, 4th: 1.143, 5th: 0.867, 6th: 0.691, with a final drive (identification code: GDF) ratio of 3.539) was included as an option.

An unusual sight in the engine compartment was the addition of [[water cooling]] for the 190&nbsp;[[ampere|amp]] [[Alternator (auto)|alternator]],<ref name="ETKA"/> along with two additional [[thermostat]]ically-controlled side-mounted [[radiator (engine cooling)|radiators]].<ref name="ETKA"/>

===B6 steering, brakes, wheels & tyres===
The B6 S4 came equipped with electronically controlled, variable assisted '[[servotronic]]' rack and pinion [[power steering|power assisted steering]] (PAS) as standard.<ref name="ETKA"/>

B6 S4 brakes<ref name="ETKA"/> consisted of radially ventilated [[disc brake]]s front and rear. The front discs are sized at {{convert|345|mm|2|abbr=on}} in diameter by {{convert|30|mm|3|abbr=on}} thick, and are clamped by [[Continental AG|Continental Teves-ATE]] FNRG-60 single-piston sliding [[brake caliper]]s. The rears are {{convert|300|mm|2|abbr=on}} by {{convert|22|mm|3|abbr=on}}, and again use single-piston sliding calipers, with an integrated cable-operated [[hand brake]] mechanism. A [[Robert Bosch GmbH|Bosch]] ESP&nbsp;5.7 [[electronic stability control|Electronic Stability Programme]] system, complete with [[anti-lock braking system|Anti-lock Braking System]] (ABS), [[electronic brakeforce distribution|Electronic Brakeforce Distribution]] (EBD), [[Emergency Brake Assist]] (EBA), Electronic Differential Lock (EDL) and Anti-Slip Regulation (ASR) - also known as [[traction control system]], coupled with a dual-rate tandem [[vacuum servo]] provided the brake actuation.

Standard wheels<ref name="ETKA"/> were 'Avus-III' die-cast aluminium alloy, 8.0Jx18H2&nbsp;ET45 in size, and fitted with {{nowrap|235/40 ZR18 95Y XL}} (eXtra Load) high performance tyres, with factory supplies being either [[Continental AG|Continental]] SportContact2 or [[Michelin]] PilotSport PS2.

===B6 body & interior===
[[File:Audi S4 Cabriolet - Flickr - The Car Spy (13).jpg|thumb|Audi S4 Cabriolet interior]]

Discrete lower door trims, along with the now trademark [[Audi S and RS models#S models|Audi 'S' model]] vertical-emphasis line grille, and solid aluminium (later replaced with plastic covered by aluminium) exterior [[wing mirror|door mirrors]], and S4 badging front and rear are all that visually distinguish the S4 from its related A4 brethren. In the interior, front and rear [[Recaro]] seats (fronts fully electric with the option of heated seats), as well as S4 logos in the instrument panel and door sills complete the detail.{{-}}


==B7 (''Typ'' 8E/8H, 2005–2008){{anchor|B7|8EC|8ED|8HE}}==
{{Infobox automobile
| name = Fourth generation (B7/8E/8H)
| image = AudiS4 B7 Avant front.jpg
| caption = Audi S4 Avant quattro in Sprint Blue with Avus-III alloy wheels (8ED, Europe)
| aka = 
| production = Nov 2004–Jun 2008<ref name="ETKA"/><br />Jan 2006–2008 (cabrio)
| assembly = Germany: [[Ingolstadt]] (Sedan & Avant)<br />Germany: [[Rheine]] ([[Karmann]]: Cabriolet)
| predecessor = Audi B6 S4
| successor = Audi B8 S4
| body_style = 4-door [[sedan (automobile)|saloon/sedan]],<ref name="ETKA"/><br />5-door [[station wagon|estate/wagon]] (Avant),<ref name="ETKA"/><br />2-door [[Convertible (car)|cabriolet]]<ref name="ETKA"/>
| platform = [[Volkswagen Group B platform#B7|Volkswagen Group B7 (PL46)]]
| engine = 4.2&nbsp;L [[V8 engine|V8]] [[multi-valve|40v]] [[DOHC]]<ref name="ETKA"/>
| transmission = 6-speed [[Getrag]] [[manual transmission|manual]],<ref name="ETKA"/><br />6-speed [[ZF Friedrichshafen|ZF]] [[ZF 6HP transmission|6HP19A]] [[tiptronic]] [[automatic transmission|automatic]]<ref name="ETKA"/>
| wheelbase = {{convert|2648|mm|1|abbr=on}}<br />Cabrio: {{convert|2654|mm|1|abbr=on}}
| length = {{convert|4586|mm|1|abbr=on}}<br />Cabrio: {{convert|4572|mm|1|abbr=on}}
| width = {{convert|1781|mm|1|abbr=on}}<br />Cabrio: {{convert|1778|mm|1|abbr=on}}
| height = {{convert|1415|mm|1|abbr=on}}<br />Cabrio: {{convert|1392|mm|1|abbr=on}}
| weight = 
| related = [[Audi A4#B7|Audi B7 A4]]<br />[[Audi RS4#B7|Audi B7 RS4]]<br />[[SEAT Exeo]]
| designer = 
| sp = uk
}}
[[File:Audi S4 sedan -- 07-22-2010.jpg|thumb|left|Audi S4 Sedan quattro (8EC, North America)]]
[[File:Audi S4 Cabriolet.jpg|thumb|left|Audi S4 Cabriolet with optional 7-spoke alloy wheels (8HE, U.S.)]]
[[File:AudiS4 B7 Avant.jpg|thumb|left|Audi S4 Avant quattro (8ED, Europe)]]

The Audi B7 platform '''Audi S4 quattro''', based on the [[Audi A4#B7|Audi B7 A4]], debuted in late 2004. Although Audi classifies it as a new car, the differences between it and the outgoing B6 S4 casually appear to be primarily cosmetic, and is still classified by the internal designation: '''''Typ'' 8E''' (although with revised sub-designations - saloon: 8EC, Avant: 8ED, and Cabriolet: 8HE).<ref name="ETKA"/> It has the same 4.2-litre [[V8 engine]] (identification code: [[list of Volkswagen Group petrol engines#B6S4|BBK]]) as the B6 S4, producing a power output of {{convert|253|kW|PS bhp|0|abbr=on}} at 7,000&nbsp;rpm, and {{convert|410|Nm|0|abbr=on}} of torque at 3,500&nbsp;rpm.

There are a few mechanical changes, such as revised springs and dampers and, from [[model year]] 2007, an updated [[Torsen]] T-3 automatically biasing centre differential, featuring a 'default' asymmetric 40:60 front-rear torque split on manual transmission models, along with the later [[Robert Bosch GmbH|Bosch]] ESP&nbsp;8.0 [[electronic stability control|Electronic Stability Programme]]<ref name="ETKA"/> and gloss black painted [[brake caliper]]s.<ref name="ETKA"/> The 'Avus-III' wheels now became an option, and were replaced by a standard offering 8.0Jx18&nbsp;inch 'S-design' 7-spoke forged alloy wheel.<ref name="ETKA"/>

A [[Bose Corporation|Bose]] sound system is now standard, whereas it was optional on the B6 S4, and an enhanced optional [[DVD|DVD-ROM]]-based RNS-E satellite navigation system replaces the previous [[CD-ROM]]-based RNS-D option.

The new [[trapezoid]]al single-frame grille, Bi-[[xenon arc lamp|Xenon]] [[high-intensity discharge lamp]] (HID) headlamps, L-shaped tail-lamps, quad exhaust tail pipes, and discrete V8 badging below the side repeater indicators help distinguish the B7 from the previous B6 model.

{{clear}}

===Audi S4 25quattro{{anchor|25quattro}}===
[[File:2006 Audi S4 25quattro.jpg|thumb|left|Audi "S4 25quattro" special edition (8EC)]]
In June 2005,<ref name="ETKA"/> Audi announced a limited edition run of 250 special edition S4 saloon cars, celebrating 25 years of [[quattro (four wheel drive system)|quattro]] four wheel drive, called the '''Audi S4 25quattro'''. Available only in the United States, the exterior has unique front and rear bumpers, a [[carbon fiber|carbon fibre]] boot lip spoiler and lower front splitter, a rear functional red tow hook, a high gloss Phantom Black painted grille with the "quattro" emblem, and 15-spoke DTM alloy wheels, along with optional dealer-fitted 'Audi four-rings' decals for the front doors. The interior features black and grey contrasting interior leathers, "quattro" embossed into the [[Recaro]] seats, and a "1 of 250" exclusive quattro gear shift knob for the manual-only gearbox.

Mechanically, the S4 25quattro was the second Audi, after the [[Audi RS4#B7|B7 RS4]], to be fitted with the latest [[Torsen]] T-3 asymmetric ATB centre differential for its quattro permanent four-wheel drive system. Under normal grip conditions, this is set with a default rearwards torque distribution bias of 40:60 front to rear, and a maximum of 100% torque can automatically be apportioned to the rear axle (and up to 80% to the front) as conditions warrant. The final drive ratios are 3.889.{{-}}

==B8 (''Typ'' 8K, 2009–2016){{anchor|B8|8K}}==
{{Infobox automobile
| name = Fifth generation (B8/8K)
| image = Audi S4 Avant (8661161216) (cropped).jpg
| aka = 
| production = Nov 2008–2016
| assembly = Germany: [[Ingolstadt]]
| predecessor = Audi B7 S4
| successor = Audi B9 S4
| body_style = 4-door [[sedan (automobile)|saloon/sedan]],<ref name="ETKA"/><br />5-door [[station wagon|estate/wagon]] (Avant)<ref name="ETKA"/>
| platform = [[Volkswagen Group B platform#MLB|Volkswagen Group MLB/MLP]]
| engine = 3.0L [[supercharged]] V6 TFSI
| transmission = 6-speed [[manual transmission|manual]],<ref name="ETKA"/><br />7-speed [[Dual-clutch transmission]] '[[Direct-Shift Gearbox|S tronic]]'<ref name="ETKA"/>
| wheelbase = {{convert|2811|mm|1|abbr=on}}
| length = {{convert|4717|mm|1|abbr=on}}
| width = {{convert|1826|mm|1|abbr=on}}
| height = saloon: {{convert|1406|mm|1|abbr=on}}<br />estate: {{convert|1415|mm|1|abbr=on}}
| weight = {{convert|1650|-|1735|kg|0|abbr=on|lk=on}}
| related = [[Audi A4 B8|Audi B8 A4]]<br>[[Audi RS4#B8|Audi B8 RS4]]<br>[[Audi A5]]
| designer = 
| sp = uk
}}

[[File:2009-2010 Audi S4 (B8) sedan 02.jpg|thumb|left|Audi S4 Sedan quattro (B8/8K, Australia)]]
[[File:Audi S4 Avant (8660063371).jpg|thumb|left|Audi S4 Avant (B8/8K, South Africa)]]

From November 2008, the fourth generation of the 'Audi S4 quattro'<ref>Audi.co.uk [http://www.audi.co.uk/audi/uk/en2/new_cars/a4/s4_saloon.html Audi S4] {{Webarchive|url=https://web.archive.org/web/20090318052152/http://www.audi.co.uk/audi/uk/en2/new_cars/a4/s4_saloon.html |date=18 March 2009 }}</ref> ('''''Typ'' 8K''') entered factory production.<ref name="ETKA"/> It is based on the [[Audi A4#B8|Audi B8 A4]],<ref>AudiWorld.com News [https://www.audiworld.com/news/07/b8-s4-exclusive-preview/ Performance Preview: exclusive look at the B8 S4] 18 November 2007</ref> built on the [[Volkswagen Group B platform#B8|Volkswagen Group MLB/MLP platform]]. Unlike the previous B6 and B7 models, the new B8 version was only available as a four-door five-seat saloon (sedan), or a five-door five-seat Avant (estate/wagon). The sport-performance two-door four-seat Cabriolet ([[convertible (car)|convertible]]) mantle is now taken by the [[Audi A5#S5|Audi S5]] Cabriolet and new Coupe. Unlike previous generations of the S4, only the sedan was imported to the United States and Canada.

Compared to the previous B6/B7 S4 which used a 4.2-litre [[V8 engine]], the B8 S4 uses a smaller [[engine displacement|displacement]] 3.0-litre TFSI [[List of Audi engines#3.0 V6 24v TFSI 213-245kW|V6 engine]], but now with the addition of [[forced induction]] via an Eaton mechanical [[supercharger]].<ref name="nytimes1"/>
[[File:2012 Audi S4 Avant interior.jpg|left|thumb|2012 S4 Avant interior]]
The previous B6/B7 S4s were the top-of-the-line models in North America, ahead of the 3.2L V6 and 4-cylinder 2.0T A4s, and competed with the BMW E46 330 and E90 335 respectively. The 3.0 TFSI V6 engine replaced the [[List of Audi engines#3.2 V6 24v FSI 188-195kW|3.2-litre FSI V6]] as the upgrade engine in the A4 and A6 lineups starting for 2009; both the 3.2-litre FSI and 3.0 TFSI were offered together until the end of the 2010 model year.<ref>{{cite web |url=http://cars.about.com/od/audi/fr/10_audi_s4.htm |title=2010 Audi S4 - Test drive and new car review - 2010 Audi S4 |publisher=Cars.about.com |date=2010-06-11 |access-date=2010-10-01 |archive-date=22 January 2010 |archive-url=https://web.archive.org/web/20100122091421/http://cars.about.com/od/audi/fr/10_audi_s4.htm |url-status=dead }}</ref> The 3.2L V6 engine is no longer offered in the A4 lineup from the 2011 model year onwards, so the recently introduced B8 S4 is now priced 9% lower than its V8 predecessors, and slots directly above the 4-cylinder 2.0T base model. The S4 now compares more closely with the [[BMW 3 Series (E90)|BMW 335i]].

Previously unavailable enthusiast driver aids were now optional, such as Audi's Sport Rear Differential, active steering and adaptive damping suspension (part of the Audi Drive Select Package). The front axle was moved by 6.1 inches to the front, which improved the weight distribution of the B8 Platform. Combined with the Sport Rear Differential Audi was able to greatly improve the weight balance and dynamics of the S4 over previous models.<ref>{{cite web|url=http://www.roadandtrack.com/index.php/tests/comparison/four-door-firepower/four-door_firepower_-_page_3_page_3 |title=Four-Door Firepower&nbsp;— page 3 - Comparison Test |publisher=RoadandTrack.com |date=2010-03-16 |access-date=2012-01-22}}</ref><ref>{{cite web |last=Wiesenfelder |first=Joe |url=http://www.cars.com/audi/s4/2010/expert-reviews/?revid=55533 |title=2010 Audi S4 Review by Joe Wiesenfelder |publisher=Cars.com |date=2009-11-06 |access-date=2012-01-22 |archive-url=https://web.archive.org/web/20120405190751/http://www.cars.com/audi/s4/2010/expert-reviews/?revid=55533 |archive-date=5 April 2012 |url-status=dead}}</ref><ref>{{cite web|url=http://www.automobilemag.com/features/great_drives/0912_2009_bmw_335i_vs_2010_audi_s4/viewall.html|title=2009 BMW 335i vs 2010 Audi S4|date=13 November 2009|work=Automobile Magazine}}</ref>

A new designed wheel was included on the B8 S4, an 8.5Jx18" '5-double-spoke S' design alloy wheel with 245/40&nbsp;ZR18 high performance tyres. Optional 19&nbsp;inch wheel and tyre packages were also available, sized at 8.5Jx19" alloy wheels with 255/35&nbsp;ZR19 tyres. LED tail lights were standard fitment, along with Audi's now-trademark LED daytime running lights at the front.

The S4 along with the other B8 models received a facelift in early 2012 for the European market and early 2013 for the Australasian market. This included a revised front-end with new headlights and grille, an updated interior, and upgraded [[Multi Media Interface|MMI]] options. Mechanically, the facelift B8 (known colloquially as the B8.5) changed to electromagnetic steering and a lighter crown gear center differential.

===B8 powertrain===
At the heart of the B8 S4 powertrain is an all-new, all aluminium-alloy 3.0-litre TFSI [[Supercharger|Supercharged (TFSI)]] [[V6 engine]] (parts code prefix: 06E, identification code: [[List of discontinued Volkswagen Group petrol engines#3.0 V6 24v TFSI (EA837)|CAKA]]),<ref name="ETKA"/> and like the rest of the B8 model range, now with [[gasoline direct injection|Fuel Stratified Injection]] (FSI). This petrol engine [[engine displacement|displaces]] {{convert|2995|cc|1}}, and it is rated by Audi to a power output of {{convert|245|kW|PS bhp|0|abbr=on}} from 5,500 to 7,000&nbsp;rpm. Torque is rated at {{convert|440|Nm|0|abbr=on}} from 2,900 to 5,300&nbsp;rpm. This power output is achieved by using [[forced induction]]&nbsp;– and specifically, an all-new [[Eaton Corporation|Eaton]] 'Twin Vortices Series' (TVS) [[Roots type supercharger|Roots-type]] positive displacement compressor.<ref>{{cite web|first=Jim|last=Parks|title=Audi Selects Eaton TVS Supercharger To Power Fuel Efficient V6|url=http://www.eaton.com/EatonCom/SearchResults/CT_167907|publisher=Eaton Corporation|work=eaton.com|date=2008-07-17|access-date=2009-07-24|quote=''when paired with direct injection and enhanced transmission ratio, the TVS supercharger helps the engine achieve 290 hp with an average fuel economy of nearly 24 miles per gallon''|archive-date=11 June 2011|archive-url=https://web.archive.org/web/20110611150700/http://www.eaton.com/EatonCom/SearchResults/CT_167907|url-status=dead}}</ref><ref>{{cite web|first=Jim|last=Parks|title=Eaton TVS Supercharger Featured On 2010 Audi S4/S4 Avant|url=http://www.eaton.com/EatonCom/SearchResults/CT_193399|publisher=Eaton Corporation|work=eaton.com|date=2008-11-06|access-date=2009-07-24|quote=''When combined with direct injection, the TVS surpasses twin turbochargers in packaging, starting performance and responsiveness''|archive-date=11 June 2011|archive-url=https://web.archive.org/web/20110611150724/http://www.eaton.com/EatonCom/SearchResults/CT_193399|url-status=dead}}</ref> This new supercharger features twin four-lobe rotors, which are axially twisted 160&nbsp;degrees. It is mounted on top of the engine, within the 'Vee', pumping air directly into the inlet manifold, and incorporates two separate [[water cooling|water-cooled]] [[intercooler]]s. This new design of supercharger is said to reduce the [[noise, vibration, and harshness]] (NVH) of the engine.

This engine is mated to either a six-speed [[manual transmission]] (identification code: KMR)<ref name="ETKA"/> or a seven-speed '[[Direct-Shift Gearbox|S tronic]]' DL501<ref>{{cite web|title=The Audi S4|url=http://www.hillsideimports.com/audi/the-audi-s4|publisher=Hillside Imports|work=hillsideimports.com|date=9 August 2014|access-date=13 May 2015|archive-date=12 May 2015|archive-url=https://web.archive.org/web/20150512053328/http://www.hillsideimports.com/audi/the-audi-s4|url-status=dead}}</ref> [[dual clutch transmission]] (identification code: LHK),<ref name="ETKA"/> the latter with steering wheel mounted paddle-shifters for [[tiptronic]] gear selection, which replaces the Tiptronic automatic transmissions found in the B6/B7 iterations. The 'Audi quattro Sports differential' fitted in the rear axle final drive unit is available as an option.{{-}}

Acceleration from 0-{{convert|100|km/h|0|abbr=on}} takes 5.1&nbsp;seconds<ref name="Audi Germany"/> for the saloon with the manual gearbox, with the Avant one tenth of a second slower at 5.2&nbsp;seconds. The same dash to {{convert|100|km/h|0|abbr=on}} in the saloon with S tronic takes 5.3&nbsp;seconds, and the Avant at 5.4&nbsp;seconds. The top speed is electronically limited to {{convert|250|km/h|0|abbr=on}}. However, a comparison in the American automotive magazine ''[[Road & Track]]''<ref>{{cite web|url=http://www.roadandtrack.com/boot/long-term-tests/2010-audi-s4-2|title=2010 Audi S4|work=Road & Track|date=12 October 2010}}</ref> showed the acceleration from 0 to {{convert|60|mph|0|abbr=on}} in 4.5 seconds for the 6-speed manual transmission. With figures like these, the B8 S4 accelerates more quickly than its V8-engined predecessors.<ref name="nytimes1"/> Audi of America claims that the version of the S4 achieves 28 highway miles per gallon, and a 0 to {{convert|60|mph|0|abbr=on}} acceleration time of 4.9 seconds with the manual transmission<ref>{{cite web|title=The 2010 Audi S4 is finally here|url=http://www.audisite.com/912/2010-audi-s4/|work=audisite.com}}</ref> and 5.1 seconds with the S tronic.<ref>{{cite web|url=http://www.automoblog.net/2010/02/22/2010-audi-s4-review/|title=2010 Audi S4 Review|work=automoblog.net}}</ref> Fuel consumption is rated at a combined {{convert|24.2|mpgus|L/100 km mpgimp}}.<ref name="Audi Germany">{{cite web |url=http://www.audi.de/de/brand/de/neuwagen/a4/s4_limousine/technische_daten_und.html |title=Audi Germany |publisher=Audi.de |date=2010-04-29 |access-date=2010-10-01 |archive-url=https://web.archive.org/web/20100926091330/http://www.audi.de/de/brand/de/neuwagen/a4/s4_limousine/technische_daten_und.html |archive-date=26 September 2010 |url-status=dead }}</ref> Therefore, the B8 S4, unlike the V8-powered B6/7 models, avoids the US [[Gas Guzzler Tax|gas guzzler tax]]. The B8 S4's 3.0 TFSI engine also gets only 1 m.p.g. less than the base 2.0 TFSI engine.<ref>{{cite news| url=https://www.nytimes.com/2009/12/27/automobiles/27ulrich-best.html?pagewanted=2 | work=The New York Times | first=Lawrence | last=Ulrich | title=A Holiday From Wishful Thinking | date=2009-12-27}}</ref> This is one of the most important reasons for Audi to downsize their engines, while keeping the output equivalent better, by using forced-induction such as supercharging or turbocharging.<ref name="nytimes1"/>

The 3.0-litre TFSI [[Supercharger|Supercharged (TFSI)]] [[V6 engine]] is shared with the [[Audi A5#S5|Audi S5]] Cabriolet (though the 7-speed S Tronic is the sole transmission) and the 2013 Audi S5 Coupe. The 2012–2015 Audi A4 3.0 TFSI quattro has a lower-output version of this engine making 272 PS (200 kW; 268 hp) at 4780-6500 rpm and 400 N⋅m (295 lb⋅ft) at 2150–4780 rpm.

Detuned versions of this engine making {{Convert|310|PS|kW hp|0|abbr=on}} are found in the [[Audi A6#C6 facelift engines|2009-11 Audi A6 3.0 TFSI (C6)]] mated to a 6-speed Tiptronic automatic transmission, the 2012 Audi A6 3.0 TFSI (C7) and 2012 [[Audi A7]] 3.0 TFSI, the latter two which are paired with an 8-speed Tiptronic automatic.

===Motorsport===
In [[auto racing|motor racing]], [[Audi Performance and Racing|APR Motorsport]] has currently entered a B8 S4 in the Grand-Am [[Continental Tire Sports Car Challenge]] Grand Sport (GS) class.<ref>Grand-Am.com [http://www.grand-am.com/schedule/entrylist.cfm?series=k&eid=1500 Fresh From Florida 200, entry list] {{webarchive|url=https://web.archive.org/web/20100116234121/http://www.grand-am.com/schedule/entrylist.cfm?series=k&eid=1500 |date=16 January 2010 }}</ref>

==B9 (''Typ'' 8W, 2017–2025){{anchor|B9|8W}}==
{{Infobox automobile
| name = Sixth generation (B9/8W)
| image = 2017 Audi S4 TFSi Quattro Automatic Sedan 3.0 Front.jpg
| caption = 2017 Audi S4 quattro 3.0 TFSI (UK)
| production = 2017–2025
| assembly = Germany: [[Ingolstadt]]
| predecessor = Audi S4 B8
| successor = [[Audi S5|Audi S5 B10]]
| body_style = 4-door [[sedan (automobile)|saloon/sedan]],<ref name="ETKA"/><br />5-door [[station wagon|estate/wagon]] (Avant)<ref name="ETKA"/>
| platform = [[Volkswagen Group B platform#MLB|Volkswagen Group MLB/MLP]]
| engine = 3.0L [[Turbocharged]] 
V6 [[List of Volkswagen Group petrol engines|TFSI]]<br>3.0L V6 TDI (2019-present, European markets only)
| transmission = 8-speed [[ZF 8HP transmission|ZF 8HP]] [[Manumatic|tiptronic]] [[automatic transmission|automatic]]
| wheelbase = {{convert|2820|mm|1|abbr=on}}
| length = {{convert|4726|mm|1|abbr=on}}<br>{{convert|4745|mm|1|abbr=on}} (Avant)
| width = {{convert|1842|mm|1|abbr=on}}
| height = {{convert|1427|mm|1|abbr=on}}
| weight = {{convert|1750|kg|0|abbr=on|lk=on}}
| related = [[Audi A4]]<br>[[Audi RS4#B9|Audi B9 RS4]]<br>[[Audi A5]]
| designer = 
| sp = uk
}}

Audi announced the B9 S4 in 2015, with the official unveiling of the European-spec model at the [[Frankfurt Motor Show#2015|2015 Frankfurt Motor Show]]. Noticeable changes to the B9 included a modern, more angular exterior, newly designed wheels, and a new turbocharged V6 engine co-developed by Porsche.<ref>{{cite web |title=Porsche and Audi to build new V6 and V8 gasoline engines |url=https://www.quattroworld.com/concepts/porsche-and-audi-to-build-new-v6-and-v8-gasoline-engines/ |website=Quattro World}}</ref> Unlike the pre-facelift B8 S4, the announced European-spec model is only available with an eight-speed torque converter automatic ([[ZF 8HP transmission|ZF 8HP55a]]).

[[File:2017 Audi S4 TFSi Quattro Automatic 3.0.jpg|thumb|left|Audi S4 Avant quattro 3.0 TFSI (UK)]]
[[File:Audi S4 Avant B9 FL IMG 4231.jpg|thumb|left|Audi S4 Avant facelift (Germany)]]
The new model uses LED main-beam and LED daytime running lights as standard, alongside dynamic turn signals and LED tail-lights. Like other Audi models, the notable feature in the new S4 is Virtual Cockpit which has Classic Layout and Sports Layout in displaying speedometer and tachometer.

The B9 S4 features standard 18-inch 5 double-spoke wheels with summer tires, or optional 19-inch 5 V-spoke wheels.

The B9's brakes use multi-piston calipers, replacing the single-piston sliding calipers of earlier models. LED headlights are standard while a flat-bottomed steering wheel, "S" embossed seats, and quad tailpipes differentiate the S4 from the B9 A4.

===B9 powertrain===

The current generation S4 is powered by a 3.0 L V6 with petrol direct injection and a single twin-scroll turbo powering the EA839 engine with {{convert|354|PS|kW hp|0|abbr=on}} and {{convert|500|Nm|0|abbr=on}}. The engine uses a hot inside V layout, which places the cylinder head exhaust ports, exhaust manifolds, and turbocharger inside the V of the engine; this is a similar arrangement to the twin-turbo V8 engines used in Audi's C7/C8 RS6 and RS7 (including C7 S6/S7).

As a result of the powertrain upgrades in the new S4, it now can accelerate from 0 to {{convert|60|mph|km/h|0|abbr=on}} in 4.2 seconds.<ref>{{cite web|title= 2018 Audi S4 First Test: So Quick! But…|url= https://www.motortrend.com/cars/audi/s4/2018/2018-audi-s4-first-test-review/|website=www.motortrend.com|date= 5 February 2018|access-date=21 May 2020}}</ref> It is electronically limited to a top speed of {{Convert|155|mph|km/h|0|abbr=on}}.<ref>{{cite web|title=Review: the 349bhp Audi S4 Avant|url=https://www.topgear.com/car-reviews/audi/a4-avant/s4-quattro-5dr-tip-tronic/first-drive|website=www.topgear.com|date=18 January 2017|access-date=10 November 2017|language=en}}</ref>

In European markets, the facelifted B9 S4 - launched in 2019 - is now powered by a 3.0-litre turbocharged ''diesel'' V6 with {{convert|347|PS|kW hp|0|abbr=on}} and {{convert|700|Nm|0|abbr=on}}, mated to a ZF 8-speed torque converter automatic gearbox and all-wheel-drive. For outside of European markets, however, it still retains the 3.0-litre petrol turbo V6.

{{clear-left}}

==See also==
*
*[[Audi S and RS models]]

==References==
{{Reflist}}

==External links==
*[http://www.audi.com Audi.com] - international corporate portal
*[https://web.archive.org/web/20080621135725/http://www.audi.co.uk/audi/uk/en2/new_cars/S_RS_models.html Audi UK - S and RS models]
*[https://web.archive.org/web/20080612104159/http://www.audiusa.com/audi/us/en2/new_cars/Audi_A4/S4.html Audi USA - S4]

{{Audi}}
{{Audi vehicles timeline (Europe) 1965–2019}}
{{Audi vehicles timeline (Europe) 2020 to date}}
{{Audi vehicles timeline (North America)}}

[[Category:Audi vehicles|S4]]
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