The First IROC Champion
Donohue raced in the inaugural IROC series in 1973/74, racing identical, specially-prepped Porsche RSRs. Of the four-race series, Donohue won the first and third of three races at Riverside and the final race of the year at Daytona. The only person to beat Donohue was his former Penske Trans-Am teammate, George Follmer. In winning the first IROC championship, Donohue beat the best-of-the-best racing drivers of that era from all of the major championships, such as Denny Hulme, Richard Petty, A.J. Foyt, Emerson Fittipaldi, Bobby Allison, David Pearson, Peter Revson, Bobby Unser, and Gordon Johncock.
Donohue, Penske, and Porsche decided to set their goals very high with the 917-30. After making various aerodynamic and suspension modifications to the car, Donohue set the then world closed-course record driving the Porsche 917-30 at the Talladega Superspeedway in Talladega, Alabama on August 9, 1975. 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 world record for eleven years, until it was broken by Rick Mears at Michigan International Speedway.
The following quote has been attributed to Donohue: "If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough horsepower."
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