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:[1]
| Rank | Driver | Points | Winnings | Series | |
|---|---|---|---|---|---|
| 1 |  Rusty Wallace | 86 | $175,000 | NASCAR Winston Cup | |
| 2 | 64 | $65,000 | NASCAR Winston Cup | ||
| 3 | 56 | $55,000 | NASCAR Winston Cup | ||
| 4 | 51 | $50,000 | IndyCar | ||
| 5 | 47 | $45,000 | IndyCar | ||
| 6 | Al Unser | 37 | $40,000 | IndyCar | |
| 7 | 30 | $40,000 | IMSA Camel GT | ||
| 8 | 29 | $40,000 | NASCAR Winston Cup | ||
| 9 | 27 | $40,000 | NASCAR Winston Cup Defending IROC Champion | ||
| 10 | 25 | $40,000 | WSPC | ||
| 11 | Tom Kendall1 | 24 | $40,000 | IMSA Camel GT | |
| 12 | 16 | $40,000 | IMSA Camel GT |
Friday, February 15, 1991
| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points | |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 5 | 5 | 40 | 0:32:31 | 14 | 26* | ||||
| 2 | 7 | 7 | 40 | Running | 4 | 17 | ||||
| 3 | 11 | 11 | Light Blue | 40 | Running | 14 | ||||
| 4 | 6 | 6 | Gold | 40 | Running | 5 | 14*** | |||
| 5 | 3 | 3 | Powder Blue | 40 | Running | 10 | ||||
| 6 | 9 | 9 | Yellow | 40 | Running | 9 | ||||
| 7 | 10 | 10 | 40 | Running | 4 | 8 | ||||
| 8 | 1 | 1 | 40 | Running | 7 | |||||
| 9 | 8 | 8 | Pink | 40 | Running | 6 | ||||
| 10 | 12 | 12 | Lime | 40 | Running | 9 |
| |||
| 11 | 4 | 4 | Tan | 37 | Crash | 4 | ||||
| 12 | 2 | 2 | Orange | 13 | Crash | 4 | 3 |
Average speed: 184.521 mph
Cautions: 2
Margin of victory: 1 cl
Lead changes: 14
Saturday, May 4, 1991
| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points | |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 3 | 10 | Orange | 38 | 0:32:16 | 25 | 26* | |||
| 2 | 11 | 2 | Yellow | 38 | Running | 4 | 20** | |||
| 3 | 6 | 7 | 38 | Running | 4 | 17** | ||||
| 4 | 12 | 1 | 38 | Running | 1 | 12 | ||||
| 5 | 5 | 8 | 38 | Running | 10 | |||||
| 6 | 10 | 3 | Tan | 38 | Running | 9 | ||||
| 7 | 8 | 5 | 38 | Running | 2 | 8 | ||||
| 8 | 2 | 11 | 37 | Running | 7 | |||||
| 9 | 1 | 12 | Lime | 36 | Running | 2 | 6 | |||
| 10 | 9 | 4 | Pink | 5 | Crash | 5 | ||||
| 11 | 4 | 9 | 4 | Crash | 5 | |||||
| 12 | 7 | 6 | Gold | 3 | Crash | 3 |
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 |
Saturday, August 3, 1991
| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points | |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 9 | 3 | White | 50 | 0:37:48 | 37 | 26* | |||
| 2 | 10 | 2 | Lime | 50 | Running | 2 | 17 | |||
| 3 | 6 | 6 | Orange | 50 | Running | 2 | 14 | |||
| 4 | 8 | 4 | 50 | Running | 4 | 15** | ||||
| 5 | 4 | 9 | 50 | Running | 4 | 13** | ||||
| 6 | 11 | 1 | 50 | Running | 9 | |||||
| 7 | 7 | 5 | 50 | Running | 8 | |||||
| 8 | 3 | 10 | Yellow | 50 | Running | 7 | ||||
| 9 | 1 | 12 | Gold | 50 | Running | 1 | 6 | |||
| 10 | 5 | 8 | Light Blue | 50 | Running | 5 | ||||
| 11 | 2 | 11 | Silver | 50 | Running | 4 | ||||
| 12 | 12 | 7 | Tommy Kendall 1 | 0 | Did Not Start, Injured | 3 |
Average speed: 158.744 mph
Cautions: none
Margin of victory: .2 sec
Lead changes: 6
Saturday, August 10, 1991
| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points | |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 1 | Pink | 30 | 0:39:12 | 30 | 26* | |||
| 2 | 4 | 4 | 30 | Running | 17 | |||||
| 3 | 11 | 9 | Al Unser Jr. 2 | 30 | Running | 14 | ||||
| 4 | 9 | 11 | 30 | Running | 12 | |||||
| 5 | 2 | 2 | 30 | Running | 10 | |||||
| 6 | 10 | 12 | 30 | Running | 9 | |||||
| 7 | 7 | 8 | Cream | 30 | Running | 8 | ||||
| 8 | 8 | 10 | 30 | Running | 7 | |||||
| 9 | 5 | 6 | Gold | 30 | Running | 6 | ||||
| 10 | 6 | 7 | Light Blue | 30 | Running | 5 | ||||
| 11 | 3 | 3 | Lime | 20 | Mechanical | 4 | ||||
| 12 | 12 | 9 | Tommy Kendall 1 | Powder Blue | 0 | Did Not Start, Injured | 3 |
Average speed: 111.49 mph
Cautions: 1 (Lap 1 for Al Unser Jr Crash)
Margin of victory: .15 sec
Lead changes: 0