Touring cars are production family sedans (Usually 4-door and sometimes referred to as "saloon cars") that have been modified to race on road circuits. They are stock production machines which are usually modified internally but which retain the body and appearance of the brand and model they are promoting.
Formal racing of "Touring Cars" and "Saloon Cars" has been in place since the late 1950s when production vehicles were raced with limited modifications. Today's touring cars still have entry-level classes that retain mostly stock components, but the top-levels are purpose-built and use race-oriented components throughout save for the body.
Touring cars are usually differentiated from GT (Grand Touring) race cars which begin life as sports cars and have higher horsepower engines.
Racing is run on road racing circuits throughout the Americas, Europe, Asia and Australia.
|Power and Weight Stats|
|Horsepower (Typical Range)||300-650|
|Race Weight (Typical Range)||1135-1452 kg
Design and Construction
Race Car Models of This Type
Various series run throughout the world with cars from manufacturers such as Acura, Audi, BMW, Chevrolet, Citroen, Ford, Honda, Hyundai, Infiniti, Lada, Mazda, Mercedes-Benz, MG, Mini, Mitsubishi, Nissan, Proton, SEAT, Subaru, Toyota and Volkswagen.
Build Your Own Touring Car
Entry-level touring car classes restrict the changes that can be made to the donor car, so it may be possible to start with a working knowledge of handling, suspension, chassis, powertrain, aerodynamics and safety.
For mid to top-level classes, advanced knowledge in the above areas becomes useful in putting together the best possible package.
To make the learning curve more manageable, it is recommended that would-be touring car racers select an "economical" (relatively speaking) base vehicle and work their way up through competitive classes locally using that vehicle as their "development platform". Many of the available books provide basic to reasonably advanced knowledge in the aspects mentioned above, so they can provide a good reference alongside your experience.
Autocross may also provide a good initial starting point, as there is less likelihood of damage to your vehicle when running by yourself on a circuit.
Suspension: Within the regulations of the sanctioning body class you wish to run in, you will want to design your car with:
- Maximum track width
- Minimum unsprung weight
- Maximum tire contact patch and grip through the largest, widest and stickiest tires permitted.
- Maximum brake stopping power
- Low ride height (with any required changes to the suspension geometry to ensure maximum tire contact patch on the road).
- Appropriate springs, anti-roll bars and damping to manage weight transfer and help the tires follow the surface of the road better.
Chassis: In Touring car racing, depending on the class, the production chassis may be modified to increase torsional rigidity, lighten the vehicle and increase safety. Changes to the placement of components (i.e. Battery) in order to redistribute weight balance can often go hand-in-hand with lightening.
Powertrain: Powertrain modifications can include extensive changes to the engine components and driveline components. The goals of changes to the powertrain should be to increase horsepower and engine efficiency. This can be accomplished through replacing stock components for increased internal flow (Intake/exhaust), improved combustion, reducing friction and removing/replacing power robbing accessories. In terms of final drive, any modifications such as limited slip differentials that increase power delivery to the road should be considered.
Aerodynamic: Depending on the class, aero devices and bodywork changes to enhance aerodynamics may be permitted. Reduction of drag should be a priority as frontal area of a production car is not changeable. Aero devices such as an underbody floor, air dam, wing (or spoiler) and diffuser are all possible depending on what is permitted by the regulations.
Designing the aero devices to work together and to balance front/rear downforce will provide optimal downforce and stability. Designing in adjustability to generate a wide range of downforce will give flexibility in setup.
Safety: Any circuit racing with other cars will require a safety cell structure, with a racing seat/harness. Other safety items such as a fuel safety cell and fire extinguisher may also be required. If a driver safety cell structure is not available off-the-shelf, it will need to be designed and fabricated.
If you intend to race under a sanctioning body, always read and understand the regulations of your chosen racing class before designing or building any race vehicle.
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Having sufficient space is important, as a cramped workshop will be difficult to work in.
Many components permitted for Touring car racing can be bolt-on type components and therefore are within the mechanical skills of most people. Challenges include the number of components which are changeable, and the difficulty in changing them (i.e. Things like engine removal), which may require specialized workshop tools.
For driver safety cell structures that must be custom fabricated, there is the additional requirement of fitting it into the vehicle and of locating mounting points that do not compromise the uni-body chassis.
The base vehicle cost is within the budget of most people. Purchasing a used vehicle makes the most sense as the car will be a "development platform" for both the builder and driver.
Racing parts will likewise be lower in cost if the base vehicle is not at the high-end of sedans.
The effort depends on the number of areas that are modified, which is another good reason to start in a Touring class that is entry-level or in Autocrossing. If your modifications are performed a little at a time, the effort will also be manageable and your experience will grow along side your knowledge.
Touring car racing can consume a larger budget through racing tires, engine rebuilds, and damage repairs. If using Autocross as your "school", the costs can be kept much lower initially.
Transportation and Support Equipment
The vehicle will likely be trailered to the track unless kept in a street-legal configuration. Support equipment is usually carried in the trailer/towing vehicle.