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Subsequent runs made with the now modified short-tail version resulted in a new closed-course speed record of 257.123 mph (413.799 km/h), beating Mercedes' record by a large margin. [1] The speed records garnered considerable publicity for Oldsmobile, and helped boost sales. The Aerotechs made several appearances at autoshows across North America.
On August 9, 1975, Donohue drove the 917–30 to a world closed-course speed record at the Talladega Superspeedway in Talladega, Alabama. His average speed around the 2.66-mile (4.28 km) high-banked oval was 221.120 mph (355.858 km/h). Donohue held the record for 11 years, until it was broken by Rick Mears at Michigan International Speedway.
Rick Mears broke the world closed-course speed record with a lap of 223.401 mph. The previous record had been 221.160, set by Mark Donohue at Talladega Superspeedway in August 1975. Mears was nearly four miles per hour faster than Al Unser in second place at 219.552 mph. Bobby Rahal completed the front row with a speed of 218.759 mph. [ 5 ]
The closed-course practice and qualifying lap records Arie Luyendyk had set in the run-up to the 1996 Indy 500 at 239.260 mph (385.052 km/h) and 237.498 mph (382.216 km/h) respectively were improved by Maurício Gugelmin at the 1997 Marlboro 500. He was clocked at 242.333 mph (389.997 km/h) and 240.942 mph (387.759 km/h) respectively, based on ...
On August 5, 1961, Malone turned a lap at 177.479 mph, a new track record, and a new world closed-course competitive track record. It broke the mark set by Tony Bettenhausen (177.038 mph) at Monza in 1957. [79] One day later, on August 6, Malone went out for another attempt, but suffered a seized transmission.
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