Enlarge / A pack of GT cars at the beginning of the 2021 12 Hours of Sebring. If you needed proof of sportscar racing being too complicated for the casual fan, consider the fact that the white #79 Porsche 911 RSR is actually radically different from the blue #16 Porsche 911 GT3 R right next to it. From next year, that confusion will be lessened. (credit: Porsche)
On Saturday, the North American sports car season will draw to a close with the Petit Le Mans, a 10-hour race held at Road Atlanta in Georgia. This year's Petit Le Mans is also the last race for a fan-favorite class of cars known as GTLM. The category covered Le Mans-legal versions of two-door production cars, which over the years represented a playground for manufacturer-supported programs and some of the world's best racing drivers.
On the one hand, the end of GTLM is a massive step for the US side of endurance racing—the end of one direct link that the WeatherTech SportsCar Championship has with annual 24 Hours of Le Mans. But it also makes the sport a bit less complicated.
"Even for some of the most avid car people, they have a hard time understanding why the red BMW is so much faster than the yellow and blue one; or the red, white, and blue Porsche is so much faster than the #9 car or the #16 or the #88," said John Doonan, president of the International Motor Sports Association (IMSA), the sport's organizer.
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source https://arstechnica.com/?p=1812676