IROC X
The tenth year of IROC competition took place in 1986. IROC X 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 took home $164,100 for his efforts.
The roster of drivers and final points standings were as follows:
| Rank | Driver | Points | Winnings | Series and reason for invite |
| [|1] |  Al Unser, Jr. | 62 | $164,100 | CART PPG IndyCar World Series 2nd in 1985 IndyCar points |
| [|2] | Bill Elliott | 59 | $82,100 | NASCAR Winston Cup Series 1985 Daytona 500, 1985 Winston 500, & 1985 Winston Million winner 2nd in 1985 Winston Cup points |
| 3 | Cale Yarborough | 57 | $60,900 | NASCAR Winston Cup Series IROC VIII Champion |
| 4 | Al Unser | 51 | $47,400 | CART PPG IndyCar World Series 1985 IndyCar Champion IROC V Champion |
| 5 |  Darrell Waltrip | 48 | $39,000 | NASCAR Winston Cup Series 1985 Winston Cup Champion |
| 6 | Harry Gant | 42 | $36,000 | NASCAR Winston Cup Series Defending IROC Champion |
| 7 | Bobby Rahal | 37 | $29,000 | CART PPG IndyCar World Series 3rd in 1985 IndyCar points |
| 8 |  Klaus Ludwig 1 | 29 | $25,000 | IMSA Camel GTP 1985 24 Hours of Le Mans Winner |
| 9 | Hans-Joachim Stuck 1 | 29 | $24,000 | World Sports-Prototype Championship 1985 World Sportscar Co-Champion |
| 10 | Hurley Haywood 2 | 28 | $23,000 | IMSA Camel GTP 3rd in 1985 IMSA Camel GTP points |
| 11 | Jochen Mass 2 | 28 | $22,000 | World Sports-Prototype Championship 3rd in 1985 World Sportscar Championship |
| 12 | Rick Mears | 25 | $20,800 | CART PPG IndyCar World Series 10th in 1985 IndyCar points |
Race results
Race One, Daytona International Speedway
Friday, February 14, 1986| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points |
| 1 | 4 | 18 | Al Unser | Chevrolet Camaro | Light Blue | 40 | 0:33:04 | 10 | 26 ' |
| 2 | 8 | 2 | Cale Yarborough | Chevrolet Camaro | 40 | Flagged | 17 | ||
| 3 | 12 | 17 | Bill Elliott | Chevrolet Camaro | Silver | 40 | Flagged | 14 | |
| 4 | 2 | 10 | Hurley Haywood | Chevrolet Camaro | 40 | Flagged | 12 | ||
| 5 | 5 | 22 | Klaus Ludwig | Chevrolet Camaro | 40 | Flagged | 10 | ||
| 6 | 7 | 8 | Hans-Joachim Stuck | Chevrolet Camaro | Orange | 39 | Flagged | 9 | |
| 7 | 11 | 19 | Darrell Waltrip | Chevrolet Camaro | 39 | Flagged | 8 | ||
| 8 | 1 | 17 | Harry Gant | Chevrolet Camaro | 32 | Fuel Pressure | 30 | 12 ' | |
| 9 | 6 | 1 | Rick Mears | Chevrolet Camaro | White | 25 | Crash | 6 | |
| 10 | 10 | 3 | Jochen Mass | Chevrolet Camaro | Pink | 4 | Crash | 5 | |
| 11 | 3 | 6 | Al Unser, Jr. | Chevrolet Camaro | Yellow | 4 | Crash | 4 | |
| 12 | 9 | 5 | Bobby Rahal | Chevrolet Camaro | Powder Blue | 4 | Crash | 3 |
' Indicates 5 bonus points added to normal race points scored for leading the most laps.
' Indicates 3 bonus points added to normal race points scored for leading the 2nd most laps
Indicates 2 bonus points added to normal race points scored for leading the 3rd most laps.
Average speed:
Cautions: 2
Margin of victory: 40 feet
Lead changes: 1
Lap Leader Breakdown
| Driver | From Lap | To Lap | Number of Laps |
| Harry Gant | 1 | 30 | 30 |
| Al Unser | 31 | 40 | 10 |
Race Two, Mid-Ohio Sports Car Course
Saturday, June 7, 1986| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points |
| 1 | 2 | 10 | Al Unser, Jr. | Chevrolet Camaro | 29 | 0:49:53 | 29 | 26 ' | |
| 2 | 1 | 8 | Bobby Rahal | Chevrolet Camaro | Orange | 29 | Flagged | 17 | |
| 3 | 6 | 1 | Darrell Waltrip | Chevrolet Camaro | White | 29 | Flagged | 14 | |
| 4 | 10 | 7 | Bill Elliott | Chevrolet Camaro | 29 | Flagged | 12 | ||
| 5 | 12 | 2 | Al Unser | Chevrolet Camaro | 29 | Flagged | 10 | ||
| 6 | 5 | 6 | Harry Gant | Chevrolet Camaro | Yellow | 29 | Flagged | 9 | |
| 7 | 3 | 20 | Jochen Mass | Chevrolet Camaro | 29 | Flagged | 8 | ||
| 8 | 7 | 17 | Hans-Joachim Stuck | Chevrolet Camaro | Silver | 29 | Flagged | 7 | |
| 9 | 8 | 18 | Klaus Ludwig | Chevrolet Camaro | Light Blue | 29 | Flagged | 6 | |
| 10 | 11 | 12 | Cale Yarborough | Chevrolet Camaro | 29 | Flagged | 5 | ||
| 11 | 9 | 5 | Hurley Haywood | Chevrolet Camaro | Powder Blue | 29 | Flagged | 4 | |
| 12 | 4 | 22 | Rick Mears | Chevrolet Camaro | 29 | Flagged | 3 |
' Indicates 5 bonus points added to normal race points scored for leading the most laps.
' Indicates 3 bonus points added to normal race points scored for leading the 2nd most laps.
' Indicates 2 bonus points added to normal race points scored for leading the 3rd most laps.
Average speed:
Cautions: none
Margin of victory: 2.87 sec
Lead changes: 0
Race Three, Talladega Superspeedway
Saturday, July 26, 1986| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points |
| 1 | 7 | 8 | Cale Yarborough | Chevrolet Camaro | Orange | 38 | 0:33:04 | 30 | 26 ' |
| 2 | 6 | 2 | Harry Gant | Chevrolet Camaro | 38 | Flagged | 17 | ||
| 3 | 9 | 18 | Bill Elliott | Chevrolet Camaro | Light Blue | 38 | Flagged | 14 | |
| 4 | 8 | 20 | Darrell Waltrip | Chevrolet Camaro | 38 | Flagged | 12 | ||
| 5 | 2 | 22 | Jochen Mass | Chevrolet Camaro | 38 | Flagged | 10 | ||
| 6 | 11 | 10 | Al Unser | Chevrolet Camaro | 38 | Flagged | 9 | ||
| 7 | 10 | 1 | Al Unser, Jr. | Chevrolet Camaro | White | 38 | Flagged | 8 | |
| 8 | 1 | 7 | Rick Mears | Chevrolet Camaro | 38 | Flagged | 8 | 10 ' | |
| 9 | 4 | 6 | Hans-Joachim Stuck | Chevrolet Camaro | Yellow | 38 | Flagged | 6 | |
| 10 | 5 | 17 | Bobby Rahal | Chevrolet Camaro | Silver | 38 | Flagged | 5 | |
| 11 | 3 | 12 | Hurley Haywood | Chevrolet Camaro | 38 | Flagged | 4 | ||
| 12 | 12 | 5 | Klaus Ludwig | Chevrolet Camaro | Powder Blue | 38 | Flagged | 3 |
' Indicates 5 bonus points added to normal race points scored for leading the most laps.
' Indicates 3 bonus points added to normal race points scored for leading the 2nd most laps
Indicates 2 bonus points added to normal race points scored for leading the 3rd most laps.
Average speed:
Cautions: none
Margin of victory: 1 cl
Lead changes: 1
Lap Leader Breakdown
| Driver | From Lap | To Lap | Number of Laps |
| Rick Mears | 1 | 8 | 8 |
| Cale Yarborough | 9 | 38 | 30 |
Race Four, Watkins Glen International
Saturday, August 9, 1986| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points |
| 1 | 5 | 6 | Al Unser, Jr. | Chevrolet Camaro | Yellow | 30 | 0:40:05 | 14 | 24 ' |
| 2 | 3 | 1 | Bill Elliott | Chevrolet Camaro | White | 30 | Flagged | 1 | 19 ' |
| 3 | 6 | 17 | Darrell Waltrip | Chevrolet Camaro | Silver | 30 | Flagged | 14 | |
| 4 | 7 | 2 | Bobby Rahal | Chevrolet Camaro | 30 | Flagged | 12 | ||
| 5 | 12 | 7 | Klaus Ludwig | Chevrolet Camaro | 30 | Flagged | 10 | ||
| 6 | 1 | 18 | Cale Yarborough | Chevrolet Camaro | Light Blue | 30 | Flagged | 9 | |
| 7 | 10 | 20 | Hurley Haywood | Chevrolet Camaro | 30 | Flagged | 8 | ||
| 8 | 9 | 8 | Hans-Joachim Stuck | Chevrolet Camaro | Orange | 30 | Flagged | 7 | |
| 9 | 11 | 10 | Rick Mears | Chevrolet Camaro | 30 | Flagged | 6 | ||
| 10 | 8 | 4 | Jochen Mass | Chevrolet Camaro | Mauve | 29 | Flagged | 5 | |
| 11 | 4 | 5 | Harry Gant | Chevrolet Camaro | Powder Blue | 29 | Flagged | 4 | |
| 12 | 2 | 11 | Al Unser | Chevrolet Camaro | 18 | Crash | 15 | 8 ' |
' Indicates 5 bonus points added to normal race points scored for leading the most laps.
' Indicates 3 bonus points added to normal race points scored for leading the 2nd most laps
' Indicates 2 bonus points added to normal race points scored for leading the 3rd most laps.
Average speed:
Cautions: none
Margin of victory: 3 cl
Lead changes: 3
Lap Leader Breakdown
| Driver | From Lap | To Lap | Number of Laps |
| Al Unser | 1 | 15 | 15 |
| Bill Elliott | 16 | 16 | 1 |
| Al Unser Jr | 17 | 30 | 14 |