Touring car racing is a motorsport road racing competition with heavily modified road-going cars. It is popular in Argentina, Australia, New Zealand, Brazil, Britain, Germany, Sweden and Norway. It has both similarities to and significant differences from stock car racing which is popular in the United States.
While not as fast as Formula One, the similarity of the cars both to each other and to fans' own vehicles makes for entertaining, well-supported racing. The lesser use of aerodynamics means following cars have a much easier time passing than in F1, and the more substantial bodies of the cars makes the subtle bumping and nudging for overtaking much more acceptable as part of racing.
As well as short "sprint" races, many touring car series include one or more endurance races, which last anything from 3 to 24 hours and are a test of reliability and pit crews as much as car, driver speed, and consistency.
Characteristics of a touring car
While rules vary from country to country, most series require that the competitors start with a standard car body, but virtually every other component may be allowed to be heavily modified for racing, including engines, suspension, brakes, wheels and tyres. Aerodynamic aids are sometimes added to the front and rear of the cars. Regulations are usually designed to limit costs by banning some of the more exotic technologies available (for instance, many series insist on a "control tyre" that all competitors must use) and keep the racing close (sometimes by ballast weight where winning a race requires the winner's car to be heavier for subsequent races).
Touring cars share some similarity with American stock car racing governed by NASCAR. However, touring cars are, at least notionally, derived from production cars while today's NASCAR vehicles are based on a common design.
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.
Touring cars are usually based upon family cars (such as hatchbacks, sedans or estates), while GT racing cars are based upon powerful sports cars, such as Ferraris or Lamborghinis (and are thus usually coupés). Underneath the bodywork, a touring car is often more closely related to its road-going origins, using many original components and mountings, while some top-flight GT cars are purpose-built tube-frame racing chassis underneath a cosmetic body shell. More recently, there has been an increasing push to make GT cars closer to the road cars with the GT3 set of regulations. 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. Most sports car championships only allow rear-wheel drive cars.
While touring cars generally have a lower technical level than sports cars, there are some exceptions.
When Sports car racing was created in the inter-war period of the 20th century however, sports cars fulfilled the role Touring Cars do today, as the production car variant of racing compared to the specialised vehicles competing in Grand Prix racing. Over time Touring Cars has drifted from its role as racing cars based on modern road cars with categories like NASCAR and DTM having little to no connection to road cars. This in turn has led to the rise of Production car racing to fulfil the role once performed by Touring Cars and Sports Cars before that.
Series of competition
Running at major international racing facilities, this series is supported by BMW, SEAT and Chevrolet. The latter fields a works team, whereas the other two only sell racing kits to be installed on their cars, providing technical support to their customers. In 2011 Volvo also entered the championship, fielding a one-car team as an evaluation for a possible heavier commitment to the series. The World Touring Car Championship features 1.6-litre cars built to Super 2000 regulations based on FIA Group N.
Following the trend of recent FIA rules, cost control is a major theme in the technical regulation.
The British Touring Car Championship (BTCC) currently competes at nine circuits in the UK with cars built to Next Generation Touring Car specification, with ballast being used to equalise performance. From 2011, cars that ran to the BTCC's own Next Generation Touring Car specification were eligible to compete in a phased move away from Super 2000 regulations. Cars are 2.0-litre saloons, station wagons and hatchbacks with over 350 bhp (260 kW) and can be front or rear-wheel drive. During the 2016 season manufacturer team entries came from BMW, Subaru, MG and Honda. Since BTCC budgets have been kept relatively low, there is a strong independent and privateer presence in the championship. Manufacturers represented by privateers include Vauxhall, Ford, Toyota, Volkswagen, Chevrolet and Audi.
Prior to 2001 the BTCC was contested by cars built to 2.0-litre supertouring regulations and had in its heyday up to nine different manufacturers.
The DTM series, the initials standing for Deutsche Tourenwagen Meisterschaft until 1996, then following a hiatus, revived as Deutsche Tourenwagen Masters in 2000, features advanced purpose built V8-powered space frame machines, covered with largely carbon fibre bodyshapes resemblant of the manufacturers' road machine (although the roof and roof pillars do originate from the production car). In order to lower costs, the engine power is limited to 600 hp (450 kW), and transmissions, brakes and tyres (Dunlop) are standard parts for all. Also, dimension and aerodynamics are equalised. The approx. 1,050 kg (2,310 lb) light DTM cars corner incredibly quickly and wear spectacular bodykits incorporating huge wheel arches and diffusers.
More than 20 works-backed entries of Opel Astra, Audi TT and Mercedes-Benz CLK contested the revived 2000 DTM series but a serious issue developed for the series when Opel pulled out ahead of the 2006 season. The series has survived this hurdle and remained popular with 18 Audi A4 and Mercedes-Benz C-Class contesting the present series.
For the 2012 season, the regulations have been adapted to make the vehicles less reliant on aerodynamic downforce and more on mechanical grip.
Since 1997, and nowadays still on the over 20 kilometres (12 mi) long famous old Nürburgring and other circuit worldwide, in average over 150 touring cars compete in the VLN series of ten typically 4 hour long races. Cars range from old 100 hp (75 kW) road legal compacts to 500 hp (370 kW) Porsche 996 and even modified DTM cars (1,250 kg (2,760 lb)). Most entrants of the 24 Hours Nürburgring collect experience here.
Between 1996 and 2010 the Swedish Touring Car Championship contained various races in Sweden and a few in Norway. The most successful car makes were Volvo, BMW, Audi and Nissan. In 2010 the championship merged with the Danish Touringcar Championship to form the Scandinavian Touring Car Championship. The 2010 champion was Robert Dahlgren, because he had achieved the best results from selected races in the Danish and Swedish championships. Rickard Rydell and Johan Kristoffersson won the championship in 2011 and 2012, in a Chevrolet and a VW, respectively. In 2013 the series merged with the TTA – Racing Elite League to form the 2013 STCC – Racing Elite League season, starring 17 drivers for Volvo, BMW, Saab, Citroën, Dacia and Honda.
Australia and New Zealand
Formerly the Australian Touring Car Championship, 'Supercars' are now recognised internationally as the 'fastest touring cars in the world' racing at speeds of up to 320kph. They are also the most expensive touring cars in the world with each car costing in excess of $1 million (AUD) which includes state of the art $250,000 (AUD) 680 hp+ engines. The current formula was devised in 1993 (based on Group A regulations) and branded as 'V8 Supercars' in 1997 and 'Supercars' in 2016. The series features grids of twenty-six cars (although in endurance races e.g. the Bathurst 1000 there can be wildcard entries, which add to the grid) with 680+ hp (500 kW). The cars are currently Ford Mustangs, Holden Commodores and Nissan Altimas. The weight limit for a Supercar is 1,350 kg (2,980 lb). The race cars themselves are derived from production body panels and space frame chassis. Both Holden and Nissan financially and technically support their favoured teams and take an active role in promotion of the series.
As the series has grown, major international motorsport organisations have become involved.
From 2013, Nissan provided a third manufacturer, working with Kelly Racing. Mercedes-Benz also joined the series in 2013 with Stone Brothers Racing, in conjunction with Erebus Racing. Volvo also joined the championship in 2014 with Garry Rogers Motorsport, in conjunction with Polestar Racing.
The series incorporates the world famous Bathurst 1000 race as a championship round. Because of the longer distance, regulations require two drivers per car for this race. This also applies to the Sandown 500 & the Gold Coast 600. These events make up Supercars 'PIRTEK Enduro Cup', which is a championship-within-a-championship where the driver combination with most points collected over the 3 Enduros wins a trophy.
- TC 2000 Championship (Argentina) (1979-still)
- SCCA Pro Racing World Challenge- during the SpeedVision/Speed Channel era, the "touring cars" in this series were lower performance vehicles modified to almost the same extent as the American Le Mans Series and Rolex Sports Car Series caliber grand touring cars. After the touring cars became a BMW-Mazda-Acura affair, the series was reformatted to include a new touring car class mostly sharing Grand Am's Continental Tire Sports Car Challenge vehicles. Shortly later, a lesser "B-Spec" group was added.
- Canadian Touring Car Championship
- CDCC Dominican National Championship
- U.S. Touring Car Championship
- Continental Tire Sports Car Challenge- features both a sports car based "grand sport" class and a touring car based "street tuner" class.
- Stock Car Brasil (1979-still, link  )
- American Touring Car Championship (2009-still)
- Copa Petrobras de Marcas (link  )
- ADAC Procar Series (Germany), formerly DMSB-Produktionswagen-Meisterschaft (DPM) with ETCC rules (1995-still)
- Renault Eurocup Mégane Trophy
- European Touring Car Cup, held at various European circuits since 2005
- Baltic Touring Car Championship
- Finnish Touring Car Championship (1987-still)
- Irish Touring Car Championship
- Portuguese Touring Car Championship
- Russian Touring Car Championship
- Cruze Cup (One-make series)
- SUPER GT Super GT (1993-present)
- Hong Kong Touring Car Championship (2002-still)
- Asian Touring Car Championship (2000–2002, 2005-still)
- Philippine Touring Car Championship (formerly the PNTCC)
- China Touring Car Championship
- Malaysian Super Series
- Macau Touring Car Championship (?
- NZ Touring Cars
- Super2 Series
- Super3 Series, link 
- Saturday Night Fever Challenge Series - Malaysia  (Club Event Series)
- Volkswagen Vento Cup India (2011-still)
- The old World Touring Car Championship, plagued by lack of support from the FIA, raced under the Group A regulations in 1987.
- Germany's former DTC adopted ETCC rules in 2004 and was renamed to DMSB-Produktionswagen-Meisterschaft
- Benelux Racing League 2004-2009
- Belgian Touring Car Series, last season in 2011.
- Australian Super Touring Championship ran from 1993 to 2001.
- Japanese Touring Car Championship (JTCC) ran from 1994 through 1998.
- Super Tourenwagen Cup (STW) ran from 1994 through 1999.
- North American Touring Car Championship (NATCC) ran from 1996 to 1997.
- Swedish Touring Car Championship (1996–2010)
- South American Super Touring Car Championship ran from 1997 through 2000.
- Norwegian Touring Car Championship
- Danish Touring Car Championship (1999–2010)
- Italian Superturismo Championship (1987–1999, 2003–2008)
- Superstars Series (2004-2013)
- French Supertouring Championship (Championnat de France de Supertourisme), last season in 2005.
- Campeonato Español de Turismos (Spanish Touring Car Championship) ran from 1959 to 1998.
- Bankfin Touring Car Championship (South African Touring Car Championship) which ended in 2000.
- Deutsche Tourenwagen Meisterschaft (1984–1994) then turned to ITCC by the FIA in 1995, based in heavily modified cars, began to be too expensive and due to retirement from Opel and Alfa Romeo the ITCC series were cancelled in 1996.
- V8Star Series
- New Zealand V8s (1994-2015)
- Bathurst 1000 held at Mount Panorama Circuit since 1963, part of the Supercars Championship (the race was held at Phillip Island from 1960–1962)
- Spa 24 Hours since 1924-1989
- 24 Hours Nürburgring at the famous old Nürburgring, since 1970, related to VLN series there
- Macau Grand Prix Guia Race (contested as part of WTCC since 2005)
- Tourist Trophy held until 1988
- Wellington 500, held at the Wellington street circuit between 1985 and 1996
- InterTEC (インターTEC), held at Fuji Speedway as part of the JTCC round through the series duration until the series' demise in 1998
Different sets of regulations do apply:
- Contemporary touring car racing: Group A · Group F · Group G · Group H · Group N · Group S · Group SE · Group SP · Next Generation Touring Car · Super 2000 · TCR Touring Car
- Historic touring car racing: Group 1 · Group 2 · Group 3 · Group 4 · Group 5 · Group B · Supertouring