THE 1988 TRANS AM CHAMPIONSHIP

11 Jan 2015 | Author: | Comments Off on THE 1988 TRANS AM CHAMPIONSHIP

A very set of regulations introduced in 1980 a generous amount of elbow for changes to the bodyshell, running engine and transmission. Under rules the Sports Car Club of (SCCA) also specifies a weight for each of the competing Restrictions can be imposed at any time on the cars, for instance, additional air restrictors or narrower tires so the races do not become predictable.

The TransAm champion was Jochen (the Austrian who later Formula 1 World Champion) an Alfa Romeo. From onwards, however, American took the limelight, as had initially planned. Eight cylinder with over 600 bhp dominated the Foreign makes very had serious chances.

Racing managers such as Roger and Dan Gurney entered well drivers for the championship, with from the manufacturers. And so the TransAm became popular with the

After an initial popularity in 1970, the TransAm suffered its decline. In fact, all kinds of were suffering the effects of the oil

But with the introduction of new regulations, the was brought to life again. The old between Ford and Chevrolet where it had left off. And car manufacturers, Nissan became a winner. new impetus was provided for the TransAm season: Hurley Walter Rohrl and Hans-Joachim competed with the Audi 200 which was received with smiles and not credited with any chances by the Americans at the start of the This was however soon to

THE DEVELOPMENT OF THE TRANS AM AUDI 200

We’ve got something to prove, and we to prove it promised Joseph manager of Audi of America Department, before the start of the

And that’s what happened. the first appearance of the four drive Audi quattros at Beach in California, the formula for the Trans Am was quite simple: the cars, based on a tubular frame chassis and fitted he most powerful engine and a fiberglass bodyshell were the most up to date technology and to the starting line.

Audi a different course, Herwart and his motorsport department had only a of months time to develop a car. Three Audi 200 had to be constructed within a very period, as the decision to participate in the US was taken at a very late

On the basis of a standard Audi 200 a competition car was prepared with 510 bhp derived from the standard 5 cylinder turbo engine, competition running gear and a with enhanced aerodynamics.

main consideration in developing the car was the wheel drive power No four wheel driven car had competed in the TransAm championship Rear wheel drive and powerful engines were the of the day: but of course a powerful is not much use if its power is not applied to the effect.

The decisive factor is therefore not pure power, but the efficient way to distribute the power to the wheels.

The Audi engineers able to draw on their experience in rallying which was in 1981 with the first of the four wheel drive quattro.

THE BODYSHELL

Compared to standards, American motorsport are very liberal. So the engineers a relatively large amount of when developing the bodyshell for a car. Only the cars profile has to correspond to the production car

Front and rear spoiler are not in this measurement.

The Audi took the monocoque bodyshell of the version Audi quattro as the for the TransAm competition car. Thy had gathered positive experience the Nardo High speed car developed in the Neckarsulm plant and the Audi 200 quattro Group A car. Both vehicles based on the standard production

For the new demands of circuit racing, requirements had to be met by the new vehicle.

Maximum protection for the driver

Optimum behavior

Best possible

A tubular steel cage was into a composite structure with a special lateral protection for the drivers safety.

stiffening was required for the running in order to cope with the cornering stresses, and optimum response was achieved by modifying the of the suspension take up points.

and handling played key functions in the design of the bodyshell. The aerodynamics, other things, determined the maximum speed, while the at the front and rear wheels handling and maximum cornering

Numerous wind tunnel and road trials were to achieve the correct dimensions and

The drivers seat for example was 40cm (15.75 inches) the rear to improve weight at the rear axle. A series of improvements, including the front and spoilers, ensured that the had minimum drag combined the best possible downforce

DRIVELINE AND RUNNING GEAR

The regulations allow extensive to the driveline as well as the body. For the complete engine can be moved to improve the weight distribution. In of the available possibilities, the Audi kept to the original quattro with the engine in front of the wheels, a center differential in the transmission and the drive taken to the through a hollow transmission

For circuit racing the TransAm car was with a modified, fully 6 speed manual transmission, to the one used successfully in the Audi quattro S1.

To improve torque on the race track, the front is controlled by a viscous coupling, and the differential has a self-locking multi-plate pack.

The car has a choice of two center given different front/rear split characteristics to suit the of the different circuits. One of these is a automatic Torsen unit, and the employs epicyclic gearing an integral viscous coupling varies the instantaneous torque and braking effect independently.

main advantage over the and a major factor in the development of the Audi 200 quattro was the Audi gear with the quattro line.

Although the suspension are completely free under US the race car retains the standard layout of the Audi 200 quattro, McPherson struts at the front and transverse links at the rear.

clearance was reduced to 65mm. a total suspension travel of this meant shortening the progressive steel springs and the … of the twin tube absorbers.

The car uses the brake of the Audi Sport quattro S1, that the front end and rear had to have the same diameter due to the weight distribution.

THE ENGINE

SCCA homologation rules and a requirement of at least 500 bhp determined the of the well proven 5 cylinder 2 engine of the standard production 200 quattro as the base engine for the car.

However a number of were necessary to bring up the level and ensure race The power unit was given an crankcase, modified combustion and bigger inlet and exhaust

To improve the weight distribution, the was relocated to the back of the passenger where it si driven directly off the drive line.

A second pump was necessary to fee the race engine with sufficient

As further measure, the boost was raised from the standard 1.7 bar to 3.0 which again involved a of engine modifications. Special were needed to withstand the stresses resulting from the boost pressure.

As well as the crankcase, the engine has a magnesium oil mimonic exhaust valves and a camshaft and crankshaft. The exhaust and intercooler were also accordingly for race conditions.

SPECIFICATIONS: THE TRANSAM AUDI 200

Turbocharged 5 cylinder aluminum in

Installed: Longitudinally, front, 27.30 degrees to the right

2110 cc

Bore and Stroke X 85mm

Valves: 2 valves per

Power: 510 bhp (375kW) at 7500 RPM to 550 bhp during the season)

Torque: at 6,000 RPM

Turbocharger: KKK turbocharger intercooler

Fuel System: BOsch

Ignition System: Bosch

Spark Plugs: Bosch platinum electrode

Lubrication: Dry with Shell TMO oil

PERMANENT WHEEL DRIVE

Clutch: plate dry clutch

Transmission: All 6 speed manual transmission

Differential: Self locking or limited slip viscous with torque split

Front Differential: Limited viscous coupling

Rear limited slip friction differential or Torsen self differential, or limited slip coupling

Drive Shafts: velocity sliding joint

ALL INDEPENDENT SUSPENSION

Suspension: As on 200 quattro standard version: McPherson struts with track control arms. Trapezium arm suspension

Shock Boge twin tube

Steering: Rack and pinion, assisted, ratio 14:1

12X16

Tyres: 25.5X13.5X16 Goodyear, 25.5X12X16 (rain)

BRAKES: HYDRAULIC TWIN SYSTEM

Components: ventilated (330mm dia X 32mm Front/304mm Dia rear, light alloy

Brake Balance: manually by driver

Brake Cooling: Ram air

Pad Material: Asbestos free

Based on Audi 200 quattro, skin panels

Equipment:

equipment: Steel cage to bodyshell, 6 point safety fire extinguisher system, safety tank.

Length/Width/Height:

Wheelbase: 2,687.5mm

Track, 1,620/1620mm

Curb Weight: (increased during the season to with additional weights.

Oil 12 litre s, water 8 litres

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