IROC XV was the fifteenth year of IROC competition, which took place in 1991. It was the second year the Dodge Daytona was used in competition, and continued the format introduced in IROC VIII. Race one took place on the Daytona International Speedway, race two took place at Talladega Superspeedway, race three ran at Michigan International Speedway, and the year finished at Watkins Glen International. Rusty Wallace won the series championship and $175,000. The roster of drivers and final points standings were as follows:

Race results

Race One, Daytona International Speedway

Friday, February 15, 1991 one *: Bonus points for leading the most laps. two **: Bonus points for leading the 2nd most laps. three ***: Bonus points for leading the 3rd most laps. Average speed: 184.521 mph Cautions: 2 Margin of victory: 1 cl Lead changes: 14

Race Two, Talladega Superspeedway

Saturday, May 4, 1991 one *: Bonus points for leading the most laps. two **: Bonus points for leading the 2nd most laps. three ***: Bonus points for leading the 3rd most laps (since there was a tie for 2nd both drivers received 2nd most laps led bonus points). Average speed: 187.958 mph Cautions: 2 Margin of victory: 1 cl Lead changes: 9 Cautions Lap Leader Breakdown

Race Three, Michigan International Speedway

Saturday, August 3, 1991 one *: Bonus points for leading the most laps. two **: Bonus points for leading the 2nd most laps. three ***: Bonus points for leading the 3rd most laps (since there was a tie for 2nd both drivers received 2nd most laps led bonus points). Average speed: 158.744 mph Cautions: none Margin of victory: .2 sec Lead changes: 6

Race Four, Watkins Glen International

Saturday, August 10, 1991 one *: Bonus points for leading the most laps. two **: Bonus points for leading the 2nd most laps (did not occur in this race so not awarded). three ***: Bonus points for leading the 3rd most laps (did not occur in this race so not awarded). Average speed: 111.49 mph Cautions: 1 (Lap 1 for Al Unser Jr Crash) Margin of victory: .15 sec Lead changes: 0