BMW E30 M3 DTM (Minichamps 1:18)

The Deutsche Tourenwagen Meisterschaft (German Touring Car Championship, or DTM) was a touring car racing series held from 1984 to 1996. Originally based in Germany, it held additional rounds elsewhere in Europe and later worldwide.

The original DTM had resumed racing with production based cars, as the former Deutsche Rennsport Meisterschaft had switched to Group 5 in the mid 1970s and even to expensive Group C sportscars in the 1980s, leading to its decline. Since 2000, a new DTM has been run as the 

 Deutsche Tourenwagen Masters, again organised by ITR.

The original DTM was started in 1984 with cars entered by privateer teams and under FIA Group A rules, but was extensively modified throughout the years, allowing more modifications. In the late 1980s, works teams joined the DTM, and it became one of the most popular motorsport in Europe. In 1993, the Group A rules were abandoned in favor of a more liberalised 2.5 L engine category called FIA Class 1 Touring Cars, with extensive use of ABS, four-wheel drive, electronic driver aids and carbon fibre chassis, the former three were technologies that were banned from F1. Opel, Mercedes-Benz and Alfa Romeo all fielded works teams after Audi and BMW had abandoned earlier.

Based on the 1986 model year E30 3-Series, the first M3 was introduced with a 2.3 L I4 S14B23 engine (also known as S14). The engine design was based on various BMW parts: basic block layout from the M10 4-cylinder (found in the 2002 and 320 series) overbored and reinforced to similar specifications of the BMW M88 inline-6. The valve train and head architecture from BMW's 

            M1 and, later, M6 inline-6-cylinder was adopted for aggressive breathing.

In contrast to later M3 iterations, the E30 M3 was campaigned by BMW as well as other racing teams including Prodrive and AC Schnitzer competing in many forms of racing including rally as well as German, British, Italian, Belgian, French, and Australian touring. The production of the E30 road car was to homologate the M3 for Group A Touring Car racing. It was to compete with the "2.3-16V"-model of the Mercedes-Benz W201 190E that was introduced in 1983. In its final years of competition, the 2.5-litre S14 engine in full race trim was capable of over 250 hp (190 kW) naturally aspirated.

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