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Group B was introduced by the FIA in 1982 as replacement for both Group 4 (modified grand touring) and Group 5 (touring prototypes) cars.
Group A referred to production-derived vehicles limited in terms of power, weight, allowed technology and overall cost. The base model had to be mass produced (5000 units/year) and had to have 4 seats. Group A was aimed at ensuring a large number of privately-owned entries in races.
By contrast, Group B had few restrictions on technology, design and the number of cars required for homologation to compete—200, less than other series. Weight was kept as low as possible, high-tech materials were permitted, and there were no restrictions on Boost, which turned out to mean almost unlimited power. The category was aimed at car manufacturers by promising outright competition victories and the subsequent publicity opportunities without the need for an existing production model. There was also a Group C, which had a similarly lax approach to chassis and engine development, but with strict rules on overall weight and maximum fuel load.
Group B was initially a very successful concept, with many manufacturers joining the premier World Rally Championship, and increased spectator numbers. But the cost of competing quickly rose, and the performance of the cars proved too much, resulting in a series of fatal crashes. As a consequence Group B was cancelled at the end of 1986 and Group A regulations became the standard for all cars until the advent of World Rally Cars in 1997.
In the following years Group B found a niche in the European Rallycross Championship, with cars such as the MG Metro 6R4 and the Ford RS200 competing as late as 1992. For 1993, the FIA replaced the Group B models with prototypes that had to be based on existing Group A cars, but still followed the spirit of Group B, with low weight, 4WD, high turboBoost pressure and staggering amounts of power.
Audi Quattro Group B - 5-Cylinder Engine Sound
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This video is about another rally icon: the Audi Quattro Gr. B. The Quattro
A1 debuted at the WRC 1983 season opener Monte Carlo Rally, and went on to
win the Swedish Rally and the Rally Portugal in the hands of Hannu Mikkola.
The A2 evolution won a total of eight world rallies; three in 1983 and five
in 1984. The car is moved by a turbocharged 2.1 L 5-cylinder engine which was
able to produce around 350 bhp.
Camcorder: Canon Legria HF M46 + Canon DM-100 Microphone
Event: 11° Rally Legend 2013 / Revival Valpantena 2013 / Monza Rally Show
Where: San Marino / Verona / Autodromo di Monza, Italy
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Group B Monsters Audi Quattro - Tribute with Pure Sound
The Awesome Audi Sport Quattro E2 Group B with pure original sounds
Tribute to the Audi Quattro Sport, S1 and S2. by KrisMotorSportVideos
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Audi RS Moments of Truth - 1983: quattro
Audi RS "Moments of Truth" is a series of highly stylized, dynamic
short-form documentaries that capture a moment in time -- visual, visceral
proof of the impact that technological innovation and risk-taking has had
on performance in a highly competitive world.
This film tells the story of Audi quattro and the advantage that four-wheel
drive technology afforded Audi race teams in the early 1980s on the FIA
World Rally Championship circuit. Audi driver and WRC Champion Hannu
Mikkola tells the story of his win at the 1983 1000 Lakes Rally in Finland
-- a grueling race full of big-air jumps and hairpin turns. Audi quattro
GmbH head of development Stephan Reil links the story to modern day
refinements of the quattro drivetrain bringing to life the technological
benefits of the crown gear and sport differential through dynamic track
footage of the all-new RS 5.
Follow the link to learn more about how performance has evolved