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Until the early 1970s, drivers typically competed on both dirt and asphalt surfaces with the same car. [2] Modified cars resemble a hybrid of open wheel cars and stock cars. The rear wheels are covered by fenders but the front wheels and engine are left exposed. There are sanctioning bodies that control the rules for this class at most tracks.
The Stock (IMCA, DIRTcar) or Street Stock (NASCAR, CRA/ASA) or Pro Stock (DIRTcar Northeast) divisions characteristically have bigger engines that produce roughly 360 horsepower, yet still require an OEM passenger vehicle production block. The rules also allow for some changes to the suspension, including the addition of screw jacks.
Dirt track racing is a form of motorsport held on clay or dirt surfaced banked oval racetracks. Dirt track racing started in the United States before World War I and became widespread during the 1920s and 1930s using both automobiles and motorcycles, spreading throughout Japan and often running on horse racing tracks.
Pro stock is a class of drag racing featuring "factory hot rods". The class is often described as "all motor", due to the cars not using any form of forced induction such as turbocharging or supercharging , or other enhancements, like nitrous oxide , along with regulations governing the modifications allowed to the engines and the types of ...
Super stock classes are similar to street stock, but allow for more modifications to the engine. Power output is usually in the range of 500–550 horsepower (373–410 kilowatts). Tire width is usually limited to 8 in (200 mm). [22] Some entry level classes are called "street stock", and are similar to what is often called "banger racing" in ...
In motorsport, the racing setup, car setup or vehicle setup is the set of adjustments made to the vehicle in order to optimize its behaviour (performance, handling, reliability, etc.) for specific conditions. Vehicle setups are variable for a variety of reasons, ranging from weather, driver/rider preference and race track characteristics.
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Brennan Poole in a UMP Modified at Houston Raceway Park in 2008.. United Midwestern Promoters (UMP) is a short track motor racing sanctioning body in the United States that sanctions short track racing on dirt race tracks from 1/5 mile (0.3 km) in length to 1-mile (1.6 km) in length.