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Cars usually have a protective roll cage and run race tires (either slicks or radials). Some freedoms are allowed, like gearbox coolers, giving the cars increased performance and components longevity. Production car racing, known in the US as "showroom stock", is an economical and rules restricted version of touring car racing. [21]
Because of the lack of an NHRA certified roll cage, which is required if the quarter-mile time is under 10 seconds, the NHRA banned the SRT Demon from competition. [53] Like the SRT Hellcat, it comes with both red and black key fobs, with the black fob limiting the power output to 500 hp (373 kW).
Roll cages may be difficult to install when the stock interior is present. Some tuners will have "gutted" interiors, or omit features that many ordinary drivers would find desirable or necessary, such as audio systems, air conditioning and soundproofing, in order to reduce vehicle weight.
The National Hot Rod Association (NHRA) is a governing body which sets rules in drag racing and hosts events all over the United States and Canada. With over 40,000 drivers in its rosters, the NHRA claims to be the largest motorsport sanctioning body in the world.
Roll cages help to stiffen the chassis, which is desirable in racing applications. Racing cages are typically either bolt-in or welded-in, with the former being more straightforward and cheaper to fit while the latter is stronger and more substantial. [2] A roll bar is a single bar behind the driver that provides moderate rollover protection.
There are hundreds of classes in drag racing, each with different requirements and restrictions on things such as weight, engine size, body style, modifications, and many others. NHRA and IHRA share some of these classes, but many are solely used by one sanctioning body or the other. The NHRA boasts over 200 classes, while the IHRA has fewer.
Some tractor operators have raised concerns about using ROPS in low-clearance environments, such as in orchards and buildings. In response, NIOSH developed an Automatically Deploying Rollover Protective Structure (AutoROPS) which stays in a lowered position until a rollover condition is determined, at which time it deploys to a fully extended and locked position.
All trucks are equipped with a steel tube roll cage. The SCORE International Rule Book [10] defines and specifies the trophy truck requirements. Gasoline engines are naturally aspirated, and typically Ford or Chevrolet V8 engines, generating in excess of 1100 hp and 950lb-ft of torque. Turbo charged diesel motors are allowed, with a minimum ...