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Audi A4/S4 Owner's Workshop Manuals, Wiring Diagrams PDF
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Audi A4 Removing and installing air mass meter Download. Audi A4 Body repairs Download. Audi A4 Body Self-diagnosis Download. Audi A4 Electrical system Download. Audi A4 Electrical system, self-diagnosis Download. Still, a story about the history and evolution of this car starts with its predecessor, called Audi Introduced in under the codename B1, this was the car whose modern design and progressive engineering took the family car market by storm.
This set the trend for all Audi models of the seventies. Some noticeable implementations were a negative roll radius that gave a more stable handling and a diagonal dual circuit brake system that revolutionized braking behavior. During the next two decades, Audi 80 introduced several features we take for granted in modern cars.
Second generation, designed Giorgetto Giugiaro combines the functionality of a spacious interior with modern looks. Zinc-plated body, low drag coefficient and redesigned rear suspension that allow more luggage space are just a part of innovations of third generation. The last generation brought a TDI engine, which revolutionized diesel technology with a lively performance and superb fuel economy. Both Audi 80 and A4 have two unique features that make them different from similar cars.
One of them is the drivetrain layout, representing the arrangement of the engine and gearbox within the car itself. Unlike other front-wheel drive cars, it has a longitudinally mounted engine with transaxle transmissions mounted at the rear. Despite many advantages, this setup places the engine at the very front of the engine bay.
This makes the car prone to under-steer in fast turns. Still, designers have always kept this tendency under control. Another feature is a famous all-wheel-drive system called Quattro. The 80 series was the base for Audi Quattro, a car that changed the face of rallying forever.
Using this superb, robust and reliable technology in Audi 80 made it the first road car with permanent four-wheel drive produced in large numbers. During the 90s, Audi introduces a new naming principle for their lineup, and the Audi 80 become Audi A4.
The trend of replacing number-based nomenclature with a combination of letters and numbers was also popular at the time with other manufacturers, such as Mercedes or Volvo. With the new name, Audi decided to position the A4 within the premium midsize car segment. The focus was on overall appearance, dynamics, and balanced performance. Although it may look similar to the old 80 at first sight, the A4 offers softer front lines and more severe rear ones.
The whole outline is slimmer and more dynamic. Body shapes are available as a 4-door sedan and 5-door estate, called Avant. Under the hood, there is a wide range of gasoline and diesel engines. Although some of them date back to the previous generation, there were also several new units available.
Most notable are the new V6 and a turbocharged four-cylinder engine with five valves per cylinder. This was the first mass-produced car in the world with this technology. Instead of gaining more power, the main goal with it was to maximize fuel efficiency and improve drivability. Among diesel engines, there are several variants of the well proven TDI unit and the new V6 diesel unit.
Other major update was the Tiptronic transmission, which, besides automatic operation, allows manual gear selection. The suspension used a double wishbone setup at the front and multi-link at the rear, which offered a great balance between ride comfort and sporty handling. This meant it was neutral on the roads, but also sharp and precise when going around the corners. Buyers recognized the upsides new A4 offers, making it an instant hit.
For those who wanted more sportiness, Audi released the S4 and RS4. With turbocharged V6 engines and Quattro system, these cars were a road going race machines. Following the huge success of the first generation, designers at Audi used the same formula to make a versatile family car.
Once again, the aim was the car that offers comfort, plenty of room and sporty potential. The new A4 received a sharp and edgy design, keeping it up to date with the new millennium.
On the outside, a tapered front end and curved windscreen gave it a certain resemblance to the TT, while the back end was similar to the older A6. Also, the 2 door convertible version joined the proven sedan-Avant duo. The biggest improvements were under the hood. Most gasoline engines were made using aluminum alloy and had increased power output.
There were several four-cylinder engines, with or without a turbocharger, and two V6 variants. The biggest upgrade for gasoline engines was a direct fuel injection, called FSI. This system uses unit injectors and gives better performance and increased fuel efficiency. Another notable update was the continuous variable transmission, named Multitronic, which replaced the conventional automatic transmission on front-wheel drive models. High on the list of priorities was the chassis which has been redesigned and strengthened.
The rear suspension received major upgrades, making it similar to one from Audi A8. With this, the handling was comparable to the rear wheel driven Mercedes and BMW while keeping the user friendly feel.
The most powerful version, offered only as S4, was less brutal when compared to its predecessor. It had a naturally aspirated V8 engine, a 6-speed manual or Tiptronic automatic gearbox and Quattro all-wheel-drive as a standard.
Despite being marked as a separate generation, this variant was in fact a facelifted B6. Audi did this to keep it in pace with growing competition in this market segment. Redesigned headlights and taillights, coupled with a new grill that matches the look of new A5 kept the exterior looking fresh for next several years. Still, with identical side panels and only minor updates to the interior, the resemblance with the older version was obvious.
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