Audi S4

Audi S4

Infobox Automobile
name = Audi S4


manufacturer = Audi AG
parent_company = Volkswagen Group
(Volkswagen AG)

aka = S4, S4 quattro
production = 1991 - present
assembly = Ingolstadt, Germany
class = Compact executive car,
Sports car
layout = Front engine,
quattro permanent four-wheel drive
related = Audi A4, Audi RS4

The Audi S4 is a high performance sport version of the Audi A4 range of cars. The S4 name was originally used for the sport version of the Audi 100.

They are, or have been available as an "Avant", Audi's name for an estate car or station wagon, a saloon or sedan, and a Cabriolet (convertable) version.

Like all Audi S cars, the S4 is only available with Audi's quattro four-wheel drive (4WD) system, with the S4 utilising the Torsen-based permanent "full-time" 4WD. The S4 has a larger more powerful engine, and larger uprated brakes, which are not shared with the remainder of the A4 range. [AudiWorld.com [http://www.audiworld.com/model/s4/content.shtml North American S4 Model Guide] - historical S4 specifications, prices, and options] __TOC__

C4 S4 ("Typ" 4A, 1992-1994)

Infobox Automobile generation


name = Audi C4 S4 ("Typ" 4A)
production = 1992 - 1994
body_style = 4-door saloon/sedan
5-door Avant (estate/wagon)
platform = Volkswagen Group C4 platform
engine = 2.2 L I5 20V turbo
4.2 L V8 32V
transmission = 5-speed manual
6-speed manual
4-speed automatic
wheelbase = convert|2692|mm|1|abbr=on|lk=on
length = convert|4790|mm|1|abbr=on to convert|4892|mm|1|abbr=on
width = convert|1803|mm|1|abbr=on
height = auto mm|1443|1
weight = saloon: convert|1730|kg|0|abbr=on|lk=on,
Avant: convert|1780|kg|0|abbr=on
fuel_capacity = convert|80|L|impgal usgal|1|lk=on|abbr=on
related = Audi 100 (C4),
Audi S6 (C4)
Audi was reconfiguring its model range during the early 1990s, and introduced the original S4 ("Typ" 4A) in 1992, as the performance version of the restyled Audi 100 (C4) saloon/sedan. Despite being based on the Volkswagen Group C4 platform, and sharing its basic structure with the 100, the S4 effectively took the place of the Audi 200 turbo quattro, which had been discontinued the year before. [cite journal|title=Preview: Audi S4|author=Stephen L. Thompson|journal=Car and Driver|issue=March 1992|pages=79–80] [cite journal|title=Magnum Force|author=rodrigo gato|journal=Car and Driver|issue=April 1992|pages=47–56] Being the first S4 model from Audi, it is commonly referred to as the "Ur-S4", derrived from the German words - Ursprünglich (meaning: original).

Following Audi's decision in discontinuing the 100 nameplate, it re-badged the car as the Audi A6 in 1994, and the S4 became the S6, although the only real changes to the model were minor cosmetic updates, and the addition of a more powerful limited edition "S6 Plus" model using the V8 engine. After the first generation A6 was replaced in 1997 by an updated version based on C5 chassis, the S4 and S6 became distinctly separate from one another.

C4 powertrain

The S4 was sold worldwide with a turbocharged version of Audi's 2.2 L (2226 cc), 20-valve inline-5 engine developing convert|169|kW|PS bhp|0|lk=on|abbr=on and convert|350|Nm|0|lk=on|abbr=on of torque. Bosch Motronic engine control unit took care of the engine management.

A convert|280|PS|kW bhp|0|abbr=on 4.2 L V8 engine became available to European customers as an option.

Standard gearbox was a manual transmission (five and six-speed in Europe, five-speed only in North America), although a 4-speed automatic transmission was available as an option. Torsen-based quattro permanent four-wheel drive was also standard.

The most common configuration 2.2 L 5-speed offered good acceleration for its day, achieving 100 km/h (62 mph) in just 6.2 seconds.

C4 brakes, wheels and tyres

Ventilated disc brakes were standard front and rear, with convert|10.9|in|1|lk=on|abbr=on diameter discs up front, and convert|10.6|in|1|abbr=on diameter discs at the rear. Anti-lock braking system (ABS) was also standard.

Standard wheels were 8Jx16 forged alloy wheels with 225/50R16 tyres. An optional 7½Jx15 alloy wheel, with 215/60R15 tyres was also available.

B5 S4 ("Typ" 8D, 1997-2002)

Infobox Automobile generation


name = Audi B5 S4 quattro ("Typ" 8D)
production = 1997 - 2002
body_style = 4-door saloon/sedan
5-door Avant (estate/wagon)
platform = Volkswagen B5 platform
engine = 2.7 L 30V V6 twin-turbo
transmission = 6-speed manual
5-speed automatic
wheelbase = auto mm|2615|1
length = auto mm|4483|1
width = 1997-99: auto mm|1733|1
2000-02: auto mm|1848|1
height = auto mm|1396|1
Avant: auto mm|1418|1
weight = convert|1535|kg|0|lk=on|abbr=on - convert|1680|kg|0|abbr=on
fuel_capacity = convert|62|L|impgal usgal|1|lk=on|abbr=on
related = Audi A4
Volkswagen Passat

The second generation S4 ("Typ" 8D), now correctly titled Audi S4 quattro debuted in 1997, as part of the facelifted B5 platform Audi A4 line-up, although it wasn't available in North America until year 2000.

In addition to the saloon/sedan, an estate/wagon version, the Audi S4 Avant, was introduced into the lineup from 1998. Production ceased on the B5 S4 in 2001 although it was still sold together with the next B6 platform generation through 2002 in North America.

Several years after it was sold new, the B5 S4 remains a potent enthusiast car, and as featured in the December 2007 issue of Sport Compact Car magazine, a Torque Factory tuned S4 won a comparison test against several other extreme performance cars. [Sport Compact Car magazine [http://www.sportcompactcarweb.com/uscc/0712_sccp_2007_ultimate_street_car_challenge/results.html 2007 Ultimate Street Car Challenge] "The Audi S4 . . . showed its capability with consistently strong finishes in the acceleration, dyno, braking and driveability tests"]

B5 Powertrain

The B5 S4 had a 2671 cc twin-turbocharged 90° "third-generation" cast iron V6 engine with two alloy cylinder heads, 5 valves per cylinder, [Audi Self-Study Programme SSP198 - The 2.7-litre V6 biturbo] [Audi.com - Glossary [http://www.audi.com/audi/com/en2/tools/glossary/engine_driveline/five_valves_per_cylinder.html five valves per cylinder] ] twin double overhead camshafts and variable valve timing and two side-mounted intercoolers (code AGB), producing convert|195|kW|PS bhp|0|lk=on|abbr=on and convert|400|Nm|0|lk=on|abbr=on. Engine management was by way of a Bosch Motronic ME 7.1 (7.0 in North America) engine control unit, and helped it meet the EU3-D emissions standard. For the North American market, the engine was slightly detuned to meet US emissions regulations, output was reduced to convert|250|hp|kW PS|0|abbr=on and convert|258|ftlb|abbr=on.

As in the previous S4, a six-speed manual transmission (01E C90, gear ratios- 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 permanent four-wheel-drive system. Final drive ratio for the manual gearbox is 4.111. A five-speed tiptronic automatic transmission became available for the first time as an option.

The S4 claims acceleration from 0 to convert|100|km/h|0|abbr=on in 5.6 seconds and had an electronically-limited top speed of convert|250|km/h|0|abbr=on, making it both the quickest saloon/sedan in the Audi model line, and among the quickest saloon/sedans in the world at that time.

B5 brakes, wheels and tires

B5 S4 brakes consisted of radially vented discs, convert|321|mm|2|lk=on|abbr=on in diameter by convert|30|mm|2|abbr=on thick up front, and convert|256|mm|2|abbr=on x convert|22|mm|2|abbr=on at the rear. Two-piston HP2 brake calipers at the front (with four pads per caliper), with single-piston sliding brake calipers at the rear. Bosch ABS 5.3 Anti-lock Braking System (with Electronic Brakeforce Distribution (EBD) and Electronic Differential Lock (EDL), and later with ESP or Electronic Stability Programme), coupled with a vacuum servo completed the system.

Standard fitment alloy wheels were "Avus" die-cast aluminium alloy, 7½Jx17" in size, shod with 225/45ZR17 performance tyres.

Motorsport

A racing form of the car experienced great success in the SpeedVision World Challenge with Michael Galati taking the 2001 SpeedVision GT title in a Champion Racing S4, with four wins, and helping Audi to its first-ever Manufacturers' Championship.

The Audi Sport spec. Champion A4 chassis had an RS4 engine, and Alcon racing brake calipers - 4-pot fronts and 2-pot rears.

B6 S4 ("Typ" 8E, 2003-2005)

Infobox Automobile generation


name = Audi B6 S4 quattro ("Typ" 8E)
production = 2003 - 2005
body_style = 4-door saloon/sedan
5-door Avant (estate/wagon)
2-door Cabriolet
platform = Volkswagen B6 platform
engine = 4.2 L 40-valve V8 2xDOHC
transmission = 6-speed manual
6-speed tiptronic automatic
wheelbase = auto mm|2651|1,
Cabrio: auto mm|2654|1
length = auto mm|4575|1,
Cabrio: auto mm|4573|1
width = auto mm|1781|1,
Cabrio: auto mm|1778|1
height = auto mm|1415|1,
Cabrio: auto mm|1391|1
weight = Saloon: convert|1660|kg|0|lk=on|abbr=on,
Avant: convert|1720|kg|0|abbr=on,
Cabrio: convert|1855|kg|0|abbr=on
fuel_capacity = convert|66|L|impgal usgal|1|lk=on|abbr=on
related = Audi A4 (B6)

The third generation S4 quattro ("Typ" 8E - saloon: 8E2, Avant: 8E5, and Cabriolet: 8H7) debuted in mid-2003. This was based on the latest Volkswagen Group B6 platform used by the Audi A4. Despite having moved to an entirely new platform, the S4's most publicised new feature was its 4.2 L V8 engine. It became available in three bodystyles for the 2004 model year: 4-door saloon/sedan, 5-door Avant (estate/wagon) (estate/wagon), and 2-door Cabriolet (convertible). [Audi Technical Data sheets - 2003 S4 quattro - saloon, Avant, and Cabriolet]

Top speed is electronically governed to convert|250|km/h|1|abbr=on|lk=on, although in line with other "S" models, based on owners experiences, and official road test reports, it is known that the governor does not activate until convert|260|km/h|1|abbr=on. Official figures for the 0-convert|100|km/h|abbr=on sprint in the saloon with manual transmission are 5.6 seconds (Avant 5.8s, Cabriolet 5.9s), however, road tests conducted by American automotive magazines indicated that it could go from a standstill to convert|100|km/h|abbr=on in 5.1 seconds, and make it to convert|200|km/h|abbr=on (124 mph) in slightly over 20 seconds, although doing this led to fuel consumption dipping into single digits, considerably lower than the earlier models, leading to the addition of a $1,700 gas guzzler tax (combined 20.2 mpg) for the 6-speed manual sedan in the United States.

The B6 platform S4 was replaced by the B7 platform S4 in late-2005.

B6 Powertrain

Replacing the 2.7 L twin-turbo V6 engine of the previous generation S4, was an all aluminium alloy 4163 cc, 40-valve V8 with 2xDOHC (chain-driven, with variable inlet camshaft timing) (code BBK), based on the unit from the Audi A8. It produced convert|253|kW|PS bhp|0|lk=on|abbr=on at 7000 rpm, and convert|410|Nm|0|lk=on|abbr=on at 3500 rpm, making it more potent than the RS2 Avant, and nearly as powerful as the B5 RS4. Engine management was by way of a Bosch Motronic ME 7.1.1 engine control unit, powering eight individual spark coils and quad-electrode spark plugs. Ignition timing is a mapped direct ignition, with cylinder-selective knock control with the aid of four knock sensors.

Like its predecessors, the model was standard with a Getrag six-speed (M6S) manual transmission (code FVD) (gear ratios - 1st: 3.667, 2nd: 2.050, 3rd: 1.462, 4th: 1.133, 5th: 0.919, 6th: 0.778), and Torsen T-2 quattro permanent four wheel drive system. Final drive (code EXZ) ratios are 3.889, giving a top gear road speed to engine revs ratio of 24.4 mph to 1000 rpm. The tiptronic automatic transmission (ratios - 1st: 4.171, 2nd: 2.340, 3rd: 1.521, 4th: 1.143, 5th: 0.867, 6th: 0.691, with a final drive ratio of 3.539) remained an option.

An unusual sight in the engine compartment was the addition of water cooling for the 190 Amp alternator.

B6 Brakes, wheels and tyres

B6 S4 Brakes consisted of radially vented discs front and rear, the fronts sized at convert|345|mm|2|lk=on|abbr=on in diameter by convert|30|mm|2|abbr=on thick, and rears at convert|302|mm|2|abbr=on x convert|20|mm|2|abbr=on. Single-piston sliding brake calipers front and rear clamped the discs. A Bosch 5.7/ESP system (complete with Anti-lock Braking System (ABS), 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 hydraulics.

Standard alloy wheels were "AVUS-III" die-cast aluminium alloy, 8Jx18" ET45 in size, and shod with 235/40ZR18 95Y ExtraLoad high performance tyres, being either Continental ContiSportContact2 or Michelin Pilot Sport PS2.

B6 Body and interior

Discrete lower door trims, along with the vertical-emphasis line grille, and solid aluminium alloy (later replaced with mock aluminium plastic) exterior mirrors, and "S4" badging front and rear are all that visually distinguish the S4 from its related A4 brethren. Interior, fully electric Recaro seats, and carbon fibre trims, complete with "S4" logos in the instrument panel complete the detail.

B7 S4 ("Typ" 8E, 2006-2008)

Infobox Automobile generation
name = Audi B7 S4 quattro ("Typ" 8E)
production = 2006 - 2008


engine = 4.2 L 40-valve V8
transmission = 6-speed manual
6-speed automatic
body_style = 4-door saloon/sedan
5-door Avant (estate/wagon)
2-door Cabriolet
wheelbase = auto mm|2648|1
Cabrio: Auto in|104.5|0
length = auto mm|4586|1
Cabrio: Auto in|180.0|0
width = auto mm|1781|1
Cabrio: Auto in|70.0|0
height = auto mm|1415|1
Cabrio: Auto in|54.8|0
platform = Volkswagen B7 platform
related = Audi A4 (B7)

The Audi B7 platform S4 quattro is the most recent version of the vehicle currently on sale, based on the B7 Audi A4, having debuted in late 2005. Although Audi classifies it as a new car, the differences between it and the outgoing B6 S4 appear to be primarily cosmetic, and is still classified by the internal designation: "Typ" 8E (saloon: 8EC, Avant: 8ED, and Cabriolet: 8HE). It has the same 4.2 L V8 engine as the B6 S4, producing convert|253|kW|PS bhp|0|lk=on|abbr=on at 7000 rpm, and convert|410|Nm|0|lk=on|abbr=on at 3500 rpm.

There are a few mechanical changes, such as revised springs and dampers and, and for model year 2008 and later, an updated centre Torsen T-3 differential, featuring a 'default' asymmetric 40:60 front-rear torque split on manual transmission quattro models. The Avus-III wheels still available, with an option of an alternative 18 inch "7-spoke" forged alloy wheel.

Bose sound system is now standard, whereas it was optional on the B6 S4, and an enhanced optional DVD-ROM-based satellite navigation system replaces the previous CD-ROM-based option.

The new "corporate" trapezoidal "single-frame grille", bi-xenon HID headlamps, "L"-shaped tail-lamps, and quad exhaust tips, and discrete "V8" badging below the side repeater indicators help distinguish the B7 from the previous B6 model.

"S4 25quattro"

In 2005, Audi announced a limited edition run of 250 special edition S4 saloon cars, celebrating 25 years of quattro four wheel drive. This exclusive model was called the Audi "S4 25quattro". Available only in the US, in Avus Silver, the exterior has unique front and rear bumpers, a carbon fibre boot lip spoiler and lower front splitter. "15-spoke DTM" alloys, along with optional dealer-fitted Audi "rings" decals for the front doors complete the exterior makeover. Black and grey contrasting interior leathers, along with "quattro" embossed into the Recaro seats, together with an individually numbered exclusive quattro gear shift knob for the manual-only gearbox define the interior changes.

On the mechanical side, the "S4 25quattro" is the second Audi, after the B7 RS4 to be fitted with the latest Torsen T-3 asymmetric centre differential for its quattro four-wheel drive system. Under 'normal' grip conditions, this is set with a rearwards torque distribution bias of 40:60 front to rear, and a maximum of 100% torque can automatically be diverted to the rear axle as conditions warrant. The gearbox final drive ratios is 3.889.

B8 S4 ("Typ" 8K, 2008-present)

Infobox Automobile generation
name = Audi B8 S4 quattro ("Typ" 8K)
production = 2008–


engine = 3.0 L supercharged FSI V6
transmission = 6-speed manual,
7-speed S-Tronic
body_style = 4-door saloon/sedan
5-door Avant (estate/wagon)
wheelbase = auto mm|2808
length = auto mm|4703
width = auto mm|1826
height = auto mm|1427; Avant: auto mm|1436
platform = Volkswagen B8 (MLB/MLP) platform
related = Audi A4 (B8)

The latest generation of the Audi S4 quattro ("Typ" 8K) will be based on the latest B8 Audi A4, [AudiWorld.com News [http://www.audiworld.com/news/07/b8-s4-exclusive-preview/ Performance Preview: Exclusive Look at the B8 S4] 18 November 2007] built on the Volkswagen B8 (MLB/MLP) platform.

The B8 S4 will revert back to a smaller displacement forced induction format, utilizing a 3.0L supercharged V6 engine from the facelifted Audi A6 tuned to produce convert|333|PS|kW bhp|0|abbr=on and 440Nm of torque. This engine is mated to either a 6-speed manual or a 7-speed S-Tronic dual clutch gearbox. [ [http://paultan.org/archives/2008/09/23/b8-audi-s4-sedan-and-avant-unveiled/ B8 Audi S4 Sedan and Avant unveiled!] ]

ee also

*Audi Ur-S4 / Ur-S6
*Audi S and RS models

References

External links

* [http://www.audi.com Audi.com] international corporate portal
* [http://www.audi.co.uk/audi/uk/en2/new_cars/S_RS_models.html Audi UK - S and RS models]
* [http://www.audiusa.com/audi/us/en2/new_cars/Audi_A4/S4.html Audi USA - S4]
* [http://infobarrel.com/Audi_S4_(B5) B5 Audi S4]
* [http://mys4.org MyS4.org - Santorin Blue 2001 Audi S4]
* [http://www.audiforums.com AudiForums.com - Audi Enthusiast Forum]
* [http://www.s4biturbo.com The Audi S4 Owners' Resource Guide]
* [http://www.audiworld.com/model/s4/01/specs.shtml Audi S4 Specs]


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