IROC XIII
The thirteenth year of IROC competition took place in 1989. IROC XIII saw the use of the Chevrolet Camaro in all races for the final year, and continued the format introduced in IROC VIII. Race one took place on the Daytona International Speedway, race two took place at Nazareth Speedway, race three ran at Michigan International Speedway, and race four concluded the year at Watkins Glen International. Terry Labonte won the series championship, and took home $204,900 for his efforts.
The roster of drivers and final points standings were as follows:
| Rank | Driver | Points | Winnings | Series |
| [|1] |  Terry Labonte | 72 | $204,900 | NASCAR Winston Cup Series 4th in 1988 Winston Cup points |
| [|2] | Al Unser, Jr. | 60 | $92,500 | CART PPG IndyCar World Series 2nd in 1988 IndyCar points 2 time and defending IROC Champion |
| 3 | Rusty Wallace | 58 | $66,200 | NASCAR Winston Cup Series 2nd in 1988 Winston Cup points |
| 4 | Dale Earnhardt | 57 | $58,900 | NASCAR Winston Cup Series 3rd in 1988 Winston Cup points 3 time Winston Cup champion |
| 5 |  Scott Pruett | 51 | $55,700 | IMSA Camel GTO 1988 GTO Champion 1988 24 Hours of Daytona GTO winner |
| 6 | Bill Elliott | 38 | $52,000 | NASCAR Winston Cup Series 1988 Winston Cup champion 2 time Daytona 500 winner |
| 7 | A. J. Foyt | 36 | $54,000 | CART PPG IndyCar World Series 4 time Indianapolis 500 winner 7 time IndyCar Champion IROC III & IROC IV champion |
| 8 | Danny Sullivan | 35 | $49,400 | CART PPG IndyCar World Series 1988 IndyCar champion 1985 Indianapolis 500 winner |
| 9 | Hurley Haywood | 31 | $46,000 | SCCA Trans-Am Series 1988 Trans-Am Champion |
| 10 |  Geoff Brabham 1 | 24 | $44,400 | IMSA Camel GTP 1988 GTP Champion 2 time 24 Hours of Le Mans winner |
| 11 | Rick Mears 1 | 24 | $42,100 | CART PPG IndyCar World Series 3 time Indianapolis 500 winner 3 time IndyCar Champion 4th in 1988 IndyCar points |
| 12 | Richard Petty | 16 | $40,400 | NASCAR Winston Cup Series 7 time Winston Cup Champion 7 time Daytona 500 winner Most ever NASCAR Cup race victories |
Race results
Race One, Daytona International Speedway
Friday, February 17, 1989| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points |
| 1 | 12 | 12 | Rusty Wallace | Chevrolet Camaro | 40 | 0:32:37 | 5 | 23 ' | |
| 2 | 5 | 5 | Terry Labonte | Chevrolet Camaro | 40 | Flagged | 6 | 20 ' | |
| 3 | 7 | 7 | Dale Earnhardt | Chevrolet Camaro | White | 40 | Flagged | 20 | 19 ' |
| 4 | 10 | 10 | Al Unser, Jr. | Chevrolet Camaro | Lime | 40 | Flagged | 5 | 14 ' |
| 5 | 3 | 3 | Bill Elliott | Chevrolet Camaro | Powder Blue | 40 | Flagged | 10 | |
| 6 | 9 | 9 | Hurley Haywood | Chevrolet Camaro | Yellow | 40 | Flagged | 9 | |
| 7 | 2 | 2 | A. J. Foyt | Chevrolet Camaro | 40 | Flagged | 8 | ||
| 8 | 1 | 1 | Rick Mears | Chevrolet Camaro | 40 | Flagged | 1 | 7 | |
| 9 | 6 | 6 | Richard Petty | Chevrolet Camaro | 40 | Flagged | 3 | 6 | |
| 10 | 8 | 8 | Scott Pruett | Chevrolet Camaro | 40 | Flagged | 5 | ||
| 11 | 11 | 11 | Geoff Brabham | Chevrolet Camaro | 40 | Flagged | 4 | ||
| 12 | 4 | 4 | Danny Sullivan | Chevrolet Camaro | 39 | 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: 9
Race Two, Nazareth Speedway
Saturday, April 29, 1989| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points |
| 1 | 1 | 12 | Danny Sullivan | Chevrolet Camaro | 75 | 0:45:40 | 14 | 23 ' | |
| 2 | 3 | 10 | Scott Pruett | Chevrolet Camaro | 75 | Flagged | 17 | 20 ' | |
| 3 | 11 | 1 | Rusty Wallace | Chevrolet Camaro | White | 75 | Flagged | 4 | 14 |
| 4 | 9 | 4 | Al Unser, Jr. | Chevrolet Camaro | Light Blue | 75 | Flagged | 12 | |
| 5 | 4 | 7 | A. J. Foyt | Chevrolet Camaro | 75 | Flagged | 40 | 15 ' | |
| 6 | 10 | 2 | Terry Labonte | Chevrolet Camaro | 74 | Flagged | 9 | ||
| 7 | 8 | 3 | Dale Earnhardt | Chevrolet Camaro | 74 | Flagged | 8 | ||
| 8 | 12 | 11 | Geoff Brabham 2 | Chevrolet Camaro | Yellow | 74 | Flagged | 7 | |
| 9 | 7 | 6 | Hurley Haywood | Chevrolet Camaro | Light Orange | 74 | Flagged | 6 | |
| 10 | 5 | 8 | Rick Mears | Chevrolet Camaro | Cream | 74 | Flagged | 5 | |
| 11 | 6 | 5 | Bill Elliott | Chevrolet Camaro | 73 | Flagged | 4 | ||
| 12 | 2 | 9 | Richard Petty | Chevrolet Camaro | 73 | 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: 3
Margin of victory: 13.45 sec
Lead changes:... 6
Lap Leader Breakdown
| Driver | From Lap | To Lap | Number of Laps |
| Danny Sullivan | 1 | 1 | 1 |
| Scott Pruett | 2 | 15 | 14 |
| A. J. Foyt | 18 | 36 | 19 |
| Rusty Wallace | 37 | 40 | 4 |
| A. J. Foyt | 41 | 59 | 19 |
| Scott Pruett | 60 | 62 | 3 |
| Danny Sullivan | 63 | 75 | 13 |
Race Three, Michigan International Speedway
Saturday, August 5, 1989| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points |
| 1 | 11 | 2 | Terry Labonte | Chevrolet Camaro | Light Blue | 50 | 0:37:54 | 33 | 26 ' |
| 2 | 10 | 3 | Dale Earnhardt | Chevrolet Camaro | 50 | Flagged | 9 | 20 ' | |
| 3 | 12 | 1 | Rusty Wallace | Chevrolet Camaro | 50 | Flagged | 3 | 14 | |
| 4 | 4 | 9 | Bill Elliott | Chevrolet Camaro | 50 | Flagged | 12 | ||
| 5 | 7 | 6 | Al Unser, Jr. | Chevrolet Camaro | 50 | Flagged | 10 | ||
| 6 | 8 | 5 | Scott Pruett | Chevrolet Camaro | Tan | 50 | Flagged | 9 | |
| 7 | 6 | 7 | A. J. Foyt | Chevrolet Camaro | 50 | Flagged | 8 | ||
| 8 | 5 | 8 | Hurley Haywood | Chevrolet Camaro | Lime | 50 | Flagged | 7 | |
| 9 | 3 | 10 | Rick Mears | Chevrolet Camaro | Powder Blue | 50 | Flagged | 6 | |
| 10 | 9 | 4 | Danny Sullivan | Chevrolet Camaro | Yellow | 50 | Flagged | 5 | |
| 11 | 1 | 12 | Richard Petty | Chevrolet Camaro | 50 | Flagged | 1 | 4 | |
| 12 | 2 | 11 | Geoff Brabham | Chevrolet Camaro | White | 50 | Flagged | 4 | 5 ' |
' 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: 158.343 mph
Cautions: none
Margin of victory:.47 sec
Lead changes: 8
Race Four, Watkins Glen International
Saturday, August 12, 1989| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points |
| 1 | 4 | 4 | Al Unser, Jr. | Chevrolet Camaro | 30 | 0:39:08 | 20 | 26 ' | |
| 2 | 5 | 5 | Scott Pruett | Chevrolet Camaro | 30 | Flagged | 17 | ||
| 3 | 1 | 1 | Terry Labonte | Chevrolet Camaro | Cream | 30 | Flagged | 10 | 17 ' |
| 4 | 8 | 8 | Bill Elliott | Chevrolet Camaro | 30 | Flagged | 12 | ||
| 5 | 3 | 3 | Dale Earnhardt | Chevrolet Camaro | 30 | Flagged | 10 | ||
| 6 | 9 | 9 | Hurley Haywood | Chevrolet Camaro | Yellow | 30 | Flagged | 9 | |
| 7 | 12 | 11 | Geoff Brabham | Chevrolet Camaro | 30 | Flagged | 8 | ||
| 8 | 2 | 2 | Rusty Wallace | Chevrolet Camaro | Powder Blue | 30 | Flagged | 7 | |
| 9 | 10 | 10 | Rick Mears | Chevrolet Camaro | White | 29 | Flagged | 6 | |
| 10 | 6 | 6 | A. J. Foyt | Chevrolet Camaro | Light Blue | 28 | Flagged | 5 | |
| 11 | 7 | 7 | Danny Sullivan | Chevrolet Camaro | 27 | Flagged | 4 | ||
| 12 | 11 | 12 | Richard Petty | Chevrolet Camaro | 17 | 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: none
Margin of victory: 1.3 sec
Lead changes: 1
Lap Leader Breakdown
| Driver | From Lap | To Lap | Number of Laps |
| Terry Labonte | 1 | 10 | 10 |
| Al Unser, Jr. | 11 | 30 | 20 |