IROC X was the tenth year of IROC competition, which took place in 1986. It saw the use of the Chevrolet Camaro in all races, it was the final season that television coverage was on CBS, and continued the format introduced in IROC VIII. Race one took place on the Daytona International Speedway, race two took place at Mid-Ohio, race three ran at Talladega Superspeedway, and race four concluded the year at Watkins Glen International. Al Unser Jr. won the championship and $164,100. The roster of drivers and final points standings were as follows:

Race results

Race One, Daytona International Speedway

Friday, February 14, 1986 (5) Indicates 5 bonus points added to normal race points scored for leading the most laps. (3) Indicates 3 bonus points added to normal race points scored for leading the 2nd most laps (2) Indicates 2 bonus points added to normal race points scored for leading the 3rd most laps (did not occur in this race so not awarded). Average speed: 181.452 mph Cautions: 2 Margin of victory: 40 feet Lead changes: 1 Lap Leader Breakdown

Race Two, Mid-Ohio Sports Car Course

Saturday, June 7, 1986 (5) Indicates 5 bonus points added to normal race points scored for leading the most laps. (3) Indicates 3 bonus points added to normal race points scored for leading the 2nd most laps (Did not occur in this race so not awarded). (2) Indicates 2 bonus points added to normal race points scored for leading the 3rd most laps (Did not occur in this race so not awarded). Average speed: 80.823 mph Cautions: none Margin of victory: 2.87 sec Lead changes: 0

Race Three, Talladega Superspeedway

Saturday, July 26, 1986 (5) Indicates 5 bonus points added to normal race points scored for leading the most laps. (3) Indicates 3 bonus points added to normal race points scored for leading the 2nd most laps (2) Indicates 2 bonus points added to normal race points scored for leading the 3rd most laps (Did not occur in this race so not awarded). Average speed: 183.411 mph Cautions: none Margin of victory: 1 cl Lead changes: 1 Lap Leader Breakdown

Race Four, Watkins Glen International

Saturday, August 9, 1986 (5) Indicates 5 bonus points added to normal race points scored for leading the most laps. (3) Indicates 3 bonus points added to normal race points scored for leading the 2nd most laps (2) Indicates 2 bonus points added to normal race points scored for leading the 3rd most laps. Average speed: 109.078 mph Cautions: none Margin of victory: 3 cl Lead changes: 3 Lap Leader Breakdown