IROC XV
The fifteenth year of IROC competition took place in 1991. IROC XV 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 took home $175,000 for his efforts.
The roster of drivers and final points standings were as follows:
| Rank | Driver | Points | Winnings | Series |
| [|1] |  Rusty Wallace | 86 | $175,000 | NASCAR Winston Cup |
| [|2] | Bill Elliott | 64 | $65,000 | NASCAR Winston Cup |
| 3 |  Mark Martin | 56 | $55,000 | NASCAR Winston Cup |
| 4 | Scott Pruett | 51 | $50,000 | IndyCar |
| 5 | Al Unser, Jr. | 47 | $45,000 | IndyCar |
| 6 | Al Unser | 37 | $40,000 | IndyCar |
| 7 |  Geoff Brabham | 30 | $40,000 | IMSA Camel GT |
| 8 | Geoff Bodine | 29 | $40,000 | NASCAR Winston Cup |
| 9 | Dale Earnhardt | 27 | $40,000 | NASCAR Winston Cup Defending IROC Champion |
| 10 |  Bob Wollek | 25 | $40,000 | WSPC |
| 11 | Tom Kendall1 | 24 | $40,000 | IMSA Camel GT |
| 12 | Dorsey Schroeder | 16 | $40,000 | IMSA Camel GT |
Race results
Race One, Daytona International Speedway
Friday, February 15th, 1991| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points |
| 1 | 5 | 5 | Scott Pruett | Dodge Daytona | 40 | 0:32:31 | 14 | 26* | |
| 2 | 7 | 7 | Bill Elliott | Dodge Daytona | 40 | Running | 4 | 17 | |
| 3 | 11 | 11 | Al Unser | Dodge Daytona | Light Blue | 40 | Running | 14 | |
| 4 | 6 | 6 | Al Unser, Jr. | Dodge Daytona | Gold | 40 | Running | 5 | 14*** |
| 5 | 3 | 3 | Tommy Kendall | Dodge Daytona | Powder Blue | 40 | Running | 10 | |
| 6 | 9 | 9 | Geoff Bodine | Dodge Daytona | Yellow | 40 | Running | 9 | |
| 7 | 10 | 10 | Mark Martin | Dodge Daytona | 40 | Running | 4 | 8 | |
| 8 | 1 | 1 | Geoff Brabham | Dodge Daytona | 40 | Running | 7 | ||
| 9 | 8 | 8 | Dorsey Schroeder | Dodge Daytona | Pink | 40 | Running | 6 | |
| 10 | 12 | 12 | Rusty Wallace | Dodge Daytona | Lime | 40 | Running | 9 | **8 |
| 11 | 4 | 4 |  Bob Wollek | Dodge Daytona | Tan | 37 | Crash | 4 | |
| 12 | 2 | 2 | Dale Earnhardt | Dodge Daytona | Orange | 13 | Crash | 4 | 3 |
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| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points |
| 1 | 3 | 10 | Rusty Wallace | Dodge Daytona | Orange | 38 | 0:32:16 | 25 | 26* |
| 2 | 11 | 2 | Bill Elliott | Dodge Daytona | Yellow | 38 | Running | 4 | 20** |
| 3 | 6 | 7 | Mark Martin | Dodge Daytona | 38 | Running | 4 | 17** | |
| 4 | 12 | 1 | Scott Pruett | Dodge Daytona | 38 | Running | 1 | 12 | |
| 5 | 5 | 8 | Geoff Brabham | Dodge Daytona | 38 | Running | 10 | ||
| 6 | 10 | 3 | Al Unser | Dodge Daytona | Tan | 38 | Running | 9 | |
| 7 | 8 | 5 | Tom Kendall | Dodge Daytona | 38 | Running | 2 | 8 | |
| 8 | 2 | 11 | Bob Wollek | Dodge Daytona | 37 | Running | 7 | ||
| 9 | 1 | 12 | Dale Earnhardt | Dodge Daytona | Lime | 36 | Running | 2 | 6 |
| 10 | 9 | 4 | Al Unser, Jr. | Dodge Daytona | Pink | 5 | Crash | 5 | |
| 11 | 4 | 9 | Dorsey Schroeder | Dodge Daytona | 4 | Crash | 5 | ||
| 12 | 7 | 6 | Geoff Bodine | Dodge Daytona | Gold | 3 | Crash | 3 |
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: 187.958 mph
Cautions: 2
Margin of victory: 1 cl
Lead changes: 9
Cautions
| From Lap | To Lap | Reason |
| 4 | 4 | Bill Elliott & Geoff Bodine crash on the backstretch |
| 6 | 6 | Al Unser Jr, Dorsey Schroeder & Dale Earnhardt crash on the backstretch |
Lap Leader Breakdown
| Driver | From Lap | To Lap | Number of Laps |
| Rusty Wallace | 1 | 2 | 2 |
| Dale Earnhardt | 3 | 4 | 2 |
| Rusty Wallace | 5 | 5 | 1 |
| Scott Pruett | 6 | 6 | 1 |
| Mark Martin | 7 | 10 | 4 |
| Bill Elliott | 11 | 14 | 4 |
| Rusty Wallace | 15 | 18 | 4 |
| Tom Kendall | 19 | 20 | 2 |
| Rusty Wallace | 21 | 38 | 18 |
Race Three, Michigan International Speedway
Saturday, August 3, 1991| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points |
| 1 | 9 | 3 | Rusty Wallace | Dodge Daytona | White | 50 | 0:37:48 | 37 | 26* |
| 2 | 10 | 2 | Bill Elliott | Dodge Daytona | Lime | 50 | Running | 2 | 17 |
| 3 | 6 | 6 | Al Unser, Jr. | Dodge Daytona | Orange | 50 | Running | 2 | 14 |
| 4 | 8 | 4 | Mark Martin | Dodge Daytona | 50 | Running | 4 | 15** | |
| 5 | 4 | 9 | Geoff Bodine | Dodge Daytona | 50 | Running | 4 | 13** | |
| 6 | 11 | 1 | Scott Pruett | Dodge Daytona | 50 | Running | 9 | ||
| 7 | 7 | 5 | Al Unser | Dodge Daytona | 50 | Running | 8 | ||
| 8 | 3 | 10 | Bob Wollek | Dodge Daytona | Yellow | 50 | Running | 7 | |
| 9 | 1 | 12 | Dale Earnhardt | Dodge Daytona | Gold | 50 | Running | 1 | 6 |
| 10 | 5 | 8 | Geoff Brabham | Dodge Daytona | Light Blue | 50 | Running | 5 | |
| 11 | 2 | 11 | Dorsey Schroeder | Dodge Daytona | Silver | 50 | Running | 4 | |
| 12 | 12 | 7 | Tommy Kendall 1 | Dodge Daytona | 0 | Did Not Start, Injured | 3 |
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: 158.744 mph
Cautions: none
Margin of victory:.2 sec
Lead changes: 6
Race Four, Watkins Glen International
Saturday, August 10, 1991| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points |
| 1 | 1 | 1 | Rusty Wallace | Dodge Daytona | Pink | 30 | 0:39:12 | 30 | 26* |
| 2 | 4 | 4 | Mark Martin | Dodge Daytona | 30 | Running | 17 | ||
| 3 | 11 | 9 | Al Unser, Jr. 2 | Dodge Daytona | 30 | Running | 14 | ||
| 4 | 9 | 11 | Dale Earnhardt | Dodge Daytona | 30 | Running | 12 | ||
| 5 | 2 | 2 | Bill Elliott | Dodge Daytona | 30 | Running | 10 | ||
| 6 | 10 | 12 | Dorsey Schroeder | Dodge Daytona | 30 | Running | 9 | ||
| 7 | 7 | 8 | Geoff Brabham | Dodge Daytona | Cream | 30 | Running | 8 | |
| 8 | 8 | 10 | Bob Wollek | Dodge Daytona | 30 | Running | 7 | ||
| 9 | 5 | 6 | Al Unser | Dodge Daytona | Gold | 30 | Running | 6 | |
| 10 | 6 | 7 | Geoff Bodine | Dodge Daytona | Light Blue | 30 | Running | 5 | |
| 11 | 3 | 3 | Scott Pruett | Dodge Daytona | Lime | 20 | Mechanical | 4 | |
| 12 | 12 | 9 | Tommy Kendall 1 | Dodge Daytona | Powder Blue | 0 | Did Not Start, Injured | 3 |
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: 111.49 mph
Cautions: 1
Margin of victory:.15 sec
Lead changes: 0