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Restrictor plate races and road courses are the only races where NASCAR enforces track limits. At the high-speed superspeedways, track limits are marked by a double yellow line (white line at Atlanta Motor Speedway starting from 2022) separating the apron from the racing surface. Exceeding track limits to advance one's position is subject to a ...
NASCAR vs F1. The Circuit of the Americas is the only track used by NASCAR and F1, but the two racing series have vastly different styles. F1 cars lap the 3.4-mile (5.5 kilometers) circuit, with its steep elevation changes and 20 turns, about 30 seconds faster than the stock cars. F1 also races with much stricter track limits than NASCAR.
Artist rendering of a NASCAR restrictor plate. A restrictor plate or air restrictor is a device installed at the intake of an engine to limit its power. This kind of system is occasionally used in road vehicles (e.g., motorcycles) for insurance purposes, but mainly in automobile racing, to limit top speed to provide equal level of competition, and to lower costs; insurance purposes have also ...
For example, NASCAR requires that a driver run at or above 115 percent of the fastest lap time by any driver in the final practice. (This can be converted to an average speed-limit based on the length of the course, which for oval tracks will be close to the actual speed limit at any given time.)
An F1 car can be no more than 200 cm wide and 95 cm tall. [1] Though there is no maximum length, other rules set indirect limits on these dimensions, and nearly every aspect of the car carries size regulations; consequently the various cars tend to be very close to the same size. The car and driver must together weigh at least 798 kg as of 2024 ...
The record stands unlikely to be broken, as restrictor plates were made mandatory at superspeedways in 1988 to reduce speeds, and the plates were then replaced in 2019 by tapered spacers which still reduced enough horsepower to prevent cars from going beyond speed of 205 mph. [65] The slowest tracks are Sonoma Raceway, a road course with a ...
NASCAR Nextel Cup Series race cars at Sonoma Raceway in June 2005. Major renovations began at Sears Point Raceway in 1998 with the creation of "the Chute", an 890 ft (270 m) high-speed stretch. The first-ever running of the American Le Mans Series took place at Sears Point in July 1999.
The 107% rule is a sporting regulation affecting Formula One racing qualifying sessions.During the first phase of qualifying, if the circuit is dry, any driver who is eliminated in the first qualifying session and fails to set a lap within 107% of the fastest time in that session will not be allowed to start the race without permission from the race stewards.