Engines
One of five types of gasoline engines can be installed on the Audi-100 as standard:
- two modifications of a 4-cylinder engine with a working volume of 2 liters and a power of 74 kW (101 HP) and 85 kW (115 HP);
- 5-cylinder engine with a displacement of 2.3 liters and a power of 98 kW (133 HP);
- two modifications of a 6-cylinder engine with volumes of 2.6 liters and 2.8 liters with a power of 110 kW (150 HP) and 128 kW (174 HP).
4-cylinder engines
The two-liter 4-cylinder engine has long been known from past generations of cars. Its production began in 1972 (then the engines of cars of the Audi-80 brand had a volume of 1.3 liters and 1.5 liters). In 1988, a 2 liter engine was created on the basis of an engine with a displacement of 1.8 liters. At each stage of the modernization of the 4-cylinder engine, its technical and operational indicators were improved, for example, all engines are equipped with a temperature-compensated timing belt tensioner, which allows maintaining the belt tension at the same level depending on the engine temperature, which ultimately leads to an increase in the operating life drive belt. All engines use hydraulic valve clearance compensators. The difference between 4-cylinder engines mainly lies in the type of injection system used. The 74 kW engine is equipped with the Mopo-Motronic central injection system. The 85 kW engine until 1992 was equipped with a KE-Motronic multipoint injection system, and then a Digifant injection system.
5 cylinder engine
The 5-cylinder 2.3-litre engine has improved over the years, as well as the temperature-compensated timing belt tensioner on the 4-cylinder engines. the KE-Jetronic distributed injection system has been upgraded. The engine develops 98 kW at 5500 rpm and a maximum torque of 186 Nm at 4000 rpm.
2.8L V6 engine
The six-cylinder engine is equipped with an MPI electronic fuel injection system with air mass measurement, which measures fuel for each cylinder separately, and therefore produces less exhaust gases and works more efficiently. The noise of fuel combustion is constantly monitored by two sensors. The eyes also belong to the selective fuel supply system. This eliminates the harmful combustion products that can be encountered when using low octane fuel.
An interesting detail of this motor is the so-called variable geometry manifold intake pipe, which serves to ensure that the frequency does not leave the high engine speed region. Six valves operate in the ventilation tube and are controlled depending on the speed: up to 4000 rpm they form long pipelines to increase the speed. Above 4000 rpm they form short pipelines for good performance. The 6-cylinder Audi engine reaches its maximum revs at 245 Nm and 3,000 rpm using Euro Super petrol. When using the Super Plus brand, a power of 250 Nm is achieved.
The ignition system of a six-cylinder engine is managed by one automation. The ignition voltage distribution from the steering gear to the fuel distribution system is controlled.
Both axles are driven by a single, maintenance-free toothed belt. Exhaust gas flows from the right and left rows of cylinders enter two catalysts that work independently of each other. Exhaust gas regulation is set by two heated sensors for each bank of cylinders.
2.6L V6 engine
The 2.6L 6-cylinder engine was presented as slightly «thinner» model back in August 1992. Slightly modified injection system (MPFI) operates on the basis of another method of measuring the amount of incoming air masses. In addition, there is no intake pipe. At a frequency of 5750 rpm, this engine reaches a power of 110 hp.
Gearboxes
All Audi-100 models are equipped with a five-speed gearbox. Four modifications of the gearbox are produced, differing from each other in gear ratios. Cars can also be equipped with an automatic transmission, depending on the version with two or five control programs.
Body
The appearance of the car is determined by the typical appearance of the Audi brand. The characteristic body with slightly rounded shapes, the exposed side wings form, as it were, one whole with the headlights. Both bumpers are painted in body color. With a drag coefficient of 0.29, the Audi-100 traditionally occupies a leading position among cars in its class.
The size of the Audi-100, in line with the trend in the global market, has not increased. Contrary to the models of the previous generation, the length of the car (4.79 m) and track (2.69 m) not changed. With a width (1.78 m) series model «C4» already by 37 mm with the same interior width. This difference in width is achieved by less curvature than previous generations.
To prevent the penetration of sunlight into the cabin, the side windows are more vertical. The wide roof and the groove above the doors keep water out of the seats when doors and windows are opened.
Front suspension
The bearing element of the front suspension is a beam fixed to the body by means of rubber-metal hinges. Two telescopic MacPherson struts with coil springs and polyurethane compression dampers are fixed to it through levers and an anti-roll bar. Front wheel bearings are pressed into the strut hubs.
Rear suspension
Front wheel drive model. The rear suspension known to us from previous models is dependent lever-spring with trailing arms and a transverse rod (panhard thrust), torsion type stabilizer and telescopic hydraulic shock absorbers. Audi-100 cars with 5- and 6-cylinder engines have an additional anti-roll bar, which improves the steering of the car.
All wheel drive model. On fourth-generation models, the rear suspension is designed completely differently. Independent wheel suspension with two trapezoidal levers, mounted on the crossbar with transverse rods, telescopic hydraulic shock absorbers, this design is due to the need to place a rear axle differential with drive shafts in the rear suspension.
Steering
Steering with rack and pinion and hydraulic booster, the gain of which varies depending on the speed of the vehicle.
A set of 15-inch 195/65 tires offers a smooth ride and good grip. Along with these, 16-inch tires are common, and there are also 17-inch tires in sizes 205/60 and 215/60.
Brake system
15-inch wheels and optimal use of space in the wheel rim made it possible to place brakes with a larger friction area, which affected the improvement of braking efficiency. The vehicle is fitted as standard with a vacuum brake booster whose progressive characteristic ensures easy brake control.
On all cars produced in the brake mechanisms of the rear wheels, a brake fluid pressure regulator is installed, which prevents the rear wheels from locking during heavy braking. Fourth generation models use a pressure regulator that takes into account both the longitudinal and lateral acceleration of the car, which helps to avoid blocking the rear wheels when driving straight ahead and cornering. Since 1993, Audi models with 4-cylinder engines have also been equipped with this anti-lock device.
Safety
Optimized with the help of mathematical simulation programs, the body structure is designed for high occupant protection. Energy-intensive deformation zones are located in the front and rear parts of the body. The layout of the units and their relative position are chosen from the conditions of maximum security of the cabin in the event of an accident.
The Audi-100 is fitted with the standard procon-ten security system. The function of the procon system is that in the event of a frontal collision, the steering column, connected to a stainless steel cable, retracts towards the dashboard in a fraction of a second. As a result, the risk of head injury is greatly reduced. The function of ten is that in the event of a collision, the seat belts, which are also woven into steel cables, tighten and securely fix the driver and passenger, thereby significantly reducing the possibility of injury to them.
Cars can be equipped with an inflatable airbag located in the steering wheel, which is activated in case of collisions at high speeds.
Precautions in Audi-100:
- Power beams built into the doors, the use of high-strength plastics significantly increase the protection of passengers.
- The sandwich B-pillars with reinforced sill and roof attachments also contribute to this. The doors overlap in relation to the pillars and in the event of a side impact they repeat the shape of the body.
- The front seats - made of a stable tubular frame design - have, in addition to high resistance to power support, a ramp in the seat frame - the front edge. This ramp counteracts the sliding of passengers in the event of a frontal collision (Effect «submarine») from under the seat belt.
- Glass glued to the body in the front and rear of the body increases the stability of the roof. In the event of a vehicle collision, the windows remain in the frame of the body and therefore improve internal and external safety
- Thanks to the volume transmission and the flexibility of the impact points in the interior of the car, the risk of injury to passengers is significantly reduced. This is particularly important when it comes into contact with the instrument panel, roof lining, sun visors, controls, side trims and head restraints. The rear-view mirror falls out of its fixing in the event of a collision.
- The fuel tank accepting up to 80 liters is located in the rear axle area. At the same time, high collision safety is achieved.
- The easy adjustment of the height of the front seat belt in five steps allows you to individually adjust the position of the seat belt in the upper body.
- The front seat belts are equipped with mechanical pretensioners.
- The rear straps can be installed in three different horizontal positions at the exit angle. When properly adjusted, the adjustable seat belt swivel does not fit tall passengers so that the seat belt slips off their shoulders, and short people so that the seat belt does not fit too close to the neck.
Environmental friendliness
Audi cars are produced using environmentally friendly materials, components and parts do not contain asbestos, the applied varnishes and plastics are free of cadmium, all foams in the seat cushions, instrument panel and decorative panels are free from fluoro-chloro-hydrocarbons.
Self-diagnosis
Electronic engine management and automatic transmission systems are equipped with built-in control systems (diagnostics). If an error or malfunction occurs in the systems, they are stored in the electronic memory of the systems in the form of codes. With the use of a special tester connected to the electrical connector of the vehicle diagnostics, it is possible to quickly and efficiently search for failures and malfunctions.
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