NASCAR's Sprint Cup and Nationwide Series currently uses restrictor plates at Daytona International Speedway and Talledaga Superspeedway. The NASCAR Sprint Cup restrictor plate reduces engine power from approximately 750 hp to approximately 430 hp.
A restrictor plate is a square aluminum plate that has four holes drilled into it. Hole size is determined by NASCAR and varies between 0.875 inches and 1 inch (2.2 to 2.5 cm). Restrictor plates are placed between the carburetor and the intake manifold to reduce the flow of air and fuel into the engine's combustion chamber reducing horsepower which slows both the acceleration and the overall top speed.
Rusty Wallace tested a car at Talladega Superspeedway without a restrictor plate in 2004, reaching a top speed of 228 mph on the backstretch and a one-lap average of 221 mph While admitting excitement at the achievement, Wallace also conceded, "There's no way we could be out there racing at those speeds... it would be insane to think we could have a pack of cars out there doing that."
A restrictor plate is a square aluminum plate that has four holes drilled into it. Hole size is determined by NASCAR and varies between 0.875 inches and 1 inch (2.2 to 2.5 cm). Restrictor plates are placed between the carburetor and the intake manifold to reduce the flow of air and fuel into the engine's combustion chamber reducing horsepower which slows both the acceleration and the overall top speed.
Rusty Wallace tested a car at Talladega Superspeedway without a restrictor plate in 2004, reaching a top speed of 228 mph on the backstretch and a one-lap average of 221 mph While admitting excitement at the achievement, Wallace also conceded, "There's no way we could be out there racing at those speeds... it would be insane to think we could have a pack of cars out there doing that."
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