Group 5 (racing)

Group 5 was an existing between the 1960 and 1981 rating group of touring cars whose changes of state series ranged widely. The regulations have been defined by the then FISA, forerunner of the FIA, in Appendix J of the International Sporting Code.

Definition

In Appendix J appeared at the beginning of the chapter " Group 5", the term " high performance cars " on. Mention is made also that the vehicles must have all the ingredients that are necessary for participation in the public streets. He was referring to turn signals, headlights, brake lights, etc. Later, put the name " Special Touring Cars " by.

Number of pieces and seats

Compared to group 1 and group 2, the requirements were set low: equipped with two seats had to be built and presented for homologation at least 25 identical cars. Outer shape, track width and wheelbase had to be identical.

Motor

Consisted considerable freedom in the processing of the motor. Thus, the cubic capacity could be increased to the upper limit of the displacement class, be it through a different number of cylinders, boring and / or increase of the stroke. Number and arrangement of the crankshaft bearings, number, and position of the camshafts and arrangement and number of inlet and outlet ports were exempt.

The "turbo factor " was set at 1.4. A common trick of the manufacturer was to use an engine with 1400 cc capacity to drive so in the class (division ) to 2 liters.

Transmission

It was only a coefficient approved, with all gears, the gear pairs were exempt; as for the final drive. As a " simple version " but was allowed a gear with other gear number are nachhomologiert. Condition was that it was " freely available on the market ."

Brake system

A distinction was made between drum brakes, disc brakes or mixed systems with drums and discs. The series system had to be maintained. It must also be ensured that the operation of the brake pedal had to all four wheels, in the case of a fault on at least two wheels of each axle.

Suspension

The principle of operation had to be maintained. Sub-function principle, the following types were distinguished:

  • MacPherson suspension
  • Wishbone
  • Semi-trailing arm (example: rear suspension of the BMW 1600)
  • Independent swing axle suspension (example: rear suspension of the Renault Gordini R 1135 )

Body

Far-reaching change freedom consisted in the body: so the fenders had to be adjusted to allow the fitting of wider wheels. Openings were allowed to be attached, which were considered necessary for the cooling of the brakes or the engine is necessary. Aerodynamic devices ( Spoilers, Wings ) could be attached. As a limitation was a maximum height of 80 cm " above the lowest point of the fully sprung structure of the vehicle ." ( This referred to the body. )

Minimum weight

Basically had to meet the minimum weight of the reported value on the homologation. This, in turn, was also subject to the restriction that it must not be less than the following values ​​depending on engine capacity:

  • Displacement 600-700 cc: 470 kg
  • Displacement 700-850 cc: 480 kg
  • Engine capacity of 850 - 1000 cm ³: 500 kg
  • Engine capacity of 1000 - 1150 cc: 510 kg
  • Engine capacity of 1150 - 1300 cc: 525 kg
  • Engine capacity of 1300 - 1600 cc: 550 kg
  • Engine capacity of 1600 - 2000 cc: 575 kg
  • Engine capacity of 2000 - 2500 cc: 600 kg
  • Engine capacity of 2500 - 3000 cc: 650 kg
  • Engine capacity of 3000 - 4000 cc: 725 kg
  • Engine capacity of 4000 - 5000 cc: 800 kg
  • Engine capacity of 5000 - 6000 cc: 875 kg
  • Engine capacity of 6000 - 7000 cc: 950 kg
  • Engine capacity over 7000 cc: 1000 kg

Compared to group 2 results in the class up to 1000 cc, an under- weight of 155 kg to 270 kg and 2000 cc to 4000 cc 390 kg; which means that the cars of the Group 5 race cars were closer than the touring car, alone in weight. Also, the performance hardly differed: on the 22.835 kilometers long Nürburgring Nordschleife needed a Group 5 Ford Capri with 7:18,48 just 8 seconds longer than a former Formula 1 car.

History

After 1 January 1972, the groups were 5 and 6 into a single group under the name " sports car - Group 5 " folded with no minimum production.

From 1977 championship category 5 vehicles were used in the German Racing. The classification was based on the displacement and was greatly simplified: Division I and Division II about 2 liters to 2 liters.

Another field of activity were endurance races for sports cars, where the cars were inferior nominally by the series origin, but quite reached top positions.

Major Group 5 cars

  • Alpine A110
  • BMW E 21 ( Jägermeister BMW)
  • BMW M1 Procar
  • Ford Zakspeed Turbo Capri
  • LANCIA Stratos HF
  • Porsche 935
Touring car racing Group 1 (racing) Group 2 (racing)
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