The World Touring Car Championship had one year in 1987 under Group A rules. But this was just at the time when the Sierra Cosworth and other turbo cars were changing and eventually ruining the formula. Apparently it was a victim of its own success, taking money from F1, so the FIA dropped it.
Group A was used by the French from 1982, British from 1983, Germans from 1984 and Australia and Japan from 1985, but Australia did allow Group As to run in Bathurst 1984 so the lead time here was long.
WI the WTCC started from 1985 and ran for a couple of years? How would this affect Group A, would the turbocars take over of would the rules be massaged to keep them even?