The turbo charged 1778 cc BDT was created in 1981, which powered the never-raced RWD Escort RS1700T. In 1984, 4WD Ford RS200 debuted with a 1803 cc version of BDT, which was created for Group B rallying. Between 1984 and 1986 the BDT engine was used in Group C endurance racing by Roy Baker, in class C2 using the Tiga GC284, GC285 and GC286. Later in 1986, a 2137 cc version was created by Brian Hart using a bespoke aluminium block and a large intercooler for RS200 Evolution, just as Group B was cancelled by the FIA. This BDT-E ('E' for Evolution) produced over in Group B 'rallycross' boost level, normally producing on a lower but sustainable boost.