Not Belgium, but Britain and Germany inspired FIA to create new rules for touring cars - but strange enough, group A and group N were not replaced.
Britain replaced the 2500 cc class of the BTCC in 1990 with an interesting experiment. Group A-like cars were allowed, with engines of 2 litres, which could be altered versions of smaller or larger engines - or an engine of a different type from the same manufacturer. A rev limiter was used to keep the engines reliable. So we got 2-litre BMW M3's fighting against Vauxhall Cavaliers, with the Group A Sierras disappearing into the distance. The next year, all cars had to run in 2-litre form. In 1993, FIA took over the regulations with few changes.
Nearly all other European countries took over, reaching as far as the Pacific, Japan and for a short while even the USA. A "world final" for these "Super Touring" cars was tried a few times. Main problem, apart from a new case of evolution cars (like the Alfa 155 Silverstone, Audi 80 competition and BMW 318 iS - which were made obsolete by a clever change of rules in 1994) was the fact that front-wheel drive, four wheel drive and rear wheel drive raced together. Weight penalties could hardly compensate this. All in all, the racing wasn't always spectacular, but there have been worse rulesets. Anyhow, in 2000 Super touring was almost dead.
1. De Jong, F, History of the European Touring Car Championship & Other International Touring Car Races: Part 5b: Epilogue, Touring car racing after 1988, Fia Class 1 and Class 2; 2010.
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