fastest nascar track
April 9, 2014 4:54pm EDT April 9, 2014 11:32am EDT How fast is NASCARâs new Sprint Cup car with new aerodynamic rules on one of its fastest tracks? Dale Earnhardt Jr. topped 215 mph during a test Wednesday morning at Michigan International Speedway, one of NASCARâs fastest tracks. Track president Roger Curtis tweeted about Earnhardt's fast speed. Joey Logano set the track qualifying record at 2-mile Michigan last year at 203.949 mph with NASCARâs new Gen-6 Sprint Cup car.