Changes For 1990
- Classes changed from four to two. Group A cars now ran alongside the all new 2 litre Touring Car Formula, with a view to a single class formula for 1991. This was to encourage new manufacturers to enter the series, with a more even field of cars and cheaper running costs. BMW and Vauxhall already entered works teams this year, with other manufacturers showing interest for future seasons.
- One hour endurance races increased from one to two.
Read more about this topic: 1990 British Touring Car Championship Season