Differences between touring cars and sports cars
For the casual observer, there can be a great deal of confusion when it comes to classifying closed-wheel racing cars as 'touring cars' or 'sports cars' (also known as GT cars). In truth, there is often very little technical difference between the two classifications, and nomenclature is often a matter of tradition.
In general, however, touring cars are based upon family cars (such as hatchbacks, saloons or estates), while GT racing cars are based upon more powerful and expensive sports cars, such as Ferraris or Lamborghinis. Underneath the bodywork, a touring car is often more closely related to its road-going origins, using many original components and mountings, while a top-flight GT car is often a purpose-built tube-frame racing chassis underneath a cosmetic body shell. Many touring car series, such as the BTCC and the now-defunct JTCC distinguish themselves from sports car racing by featuring front-wheel drive, four-wheel drive and rear-wheel drive cars with smaller engines.
However, while touring cars have a lower technical level than sports cars in general, there are notable exceptions to the rule. The Deutsche Tourenwagen Masters (DTM) is considered to be one of the most technologically advanced racing series in the world, with cars that, underneath their four-door shells, are more purebred racing machines than most FIA-GT vehicles.
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