IROC XII
The twelfth year of IROC competition took place in 1988. IROC XII saw the use of the Chevrolet Camaro in all races, and continued the format introduced in IROC VIII. Race one took place on the Daytona International Speedway, race two took place at Riverside International Raceway, race three ran at Michigan International Speedway, and race four concluded the year at Watkins Glen International. Al Unser, Jr. won his second championship, and took home $211,900 for his efforts.
The roster of drivers and final points standings were as follows:
| Rank | Driver | Points | Winnings | Series |
| 1 |  Al Unser, Jr. | 66 | $211,900 | CART PPG IndyCar World Series 3rd in 1987 IndyCar points 1987 24 Hours of Daytona GTP winner IROC X Champion |
| 2 | Terry Labonte | 55 | $95,000 | NASCAR Winston Cup Series 3rd in 1987 Winston Cup points |
| 3 | Scott Pruett | 51 | $72,900 | SCCA Trans-Am Series 1987 Trans-Am Champion 1987 24 Hours of Daytona GTO winner |
| 4 | Bill Elliott | 46 | $58,900 | NASCAR Winston Cup Series 2nd in 1987 Winston Cup points 1987 24 Hours of Daytona GTO winner |
| 5 |  Dale Earnhardt 1 | 45 | $51,000 | NASCAR Winston Cup Series 1987 Winston Cup Series Champion |
| 6 | Geoff Bodine 1 | 45 | $49,500 | NASCAR Winston Cup Series Defending IROC Champion |
| 7 | Al Holbert | 39 | $35,000 | IMSA Camel GTP 1987 24 Hours of Daytona GTP winner 1987 24 Hours of Le Mans winner 4th in 1987 IMSA GTP points |
| 8 | Al Unser | 38 | $34,000 | CART PPG IndyCar World Series 1987 Indianapolis 500 winner IROC V Champion |
| 9 | Chip Robinson | 36 | $38,000 | IMSA Camel GTP 1987 Camel GTP Champion 1987 24 Hours of Daytona GTP winner |
| 10 | Chris Cord | 26 | $32,000 | IMSA Camel GTO 1987 Camel GTO Champion |
| 11 | Bobby Rahal | 24 | $31,000 | CART PPG IndyCar World Series & IMSA Camel GTP 1987 IndyCar Champion 1987 12 Hours of Sebring GTP winner 5th in 1987 Camel GTP points |
| 12 |  Roberto Guerrero | 19 | $30,400 | CART PPG IndyCar World Series 4th in 1987 IndyCar points |
Race results
Race One, Daytona International Speedway
Friday, February 12, 1988| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points |
| 1 | 1 | 15 | Bill Elliott | Chevrolet Camaro | Gold | 40 | 0:32:13 | 40 | 26 ' |
| 2 | 6 | 14 | Dale Earnhardt | Chevrolet Camaro | Lime | 40 | Flagged | 17 | |
| 3 | 5 | 23 | Terry Labonte | Chevrolet Camaro | Pink | 40 | Flagged | 14 | |
| 4 | 9 | 3 | Al Unser, Jr. | Chevrolet Camaro | 40 | Flagged | 12 | ||
| 5 | 7 | 12 | Geoff Bodine | Chevrolet Camaro | 40 | Flagged | 10 | ||
| 6 | 2 | 17 | Al Unser | Chevrolet Camaro | Silver | 40 | Flagged | 9 | |
| 7 | 8 | 24 | Al Holbert | Chevrolet Camaro | Light Blue | 40 | Flagged | 8 | |
| 8 | 11 | 1 | Scott Pruett | Chevrolet Camaro | 40 | Flagged | 7 | ||
| 9 | 10 | 8 | Chris Cord | Chevrolet Camaro | Orange | 40 | Flagged | 6 | |
| 10 | 4 | 4 | Bobby Rahal | Chevrolet Camaro | Tan | 39 | Flagged | 5 | |
| 11 | 3 | 2 | Chip Robinson | Chevrolet Camaro | 37 | Flagged | 4 | ||
| 12 | 12 | ?? | Roberto Guerrero | Chevrolet Camaro | 0 | Did not start, Injured | 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: 1
Margin of victory: 2 cl
Lead changes: 0
Race Two, Riverside International Raceway
Saturday, June 11, 1988| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points |
| 1 | 5 | 8 | Scott Pruett | Chevrolet Camaro | Mustard | 30 | 0:46:34 | 10 | 24 ' |
| 2 | 2 | 11 | Chip Robinson | Chevrolet Camaro | 30 | Flagged | 20 | 22 ' | |
| 3 | 9 | 4 | Al Unser, Jr. | Chevrolet Camaro | 30 | Flagged | 14 | ||
| 4 | 10 | 3 | Terry Labonte | Chevrolet Camaro | Lime | 30 | Flagged | 12 | |
| 5 | 6 | 7 | Al Holbert | Chevrolet Camaro | 30 | Flagged | 10 | ||
| 6 | 7 | 6 | Al Unser | Chevrolet Camaro | Silver | 30 | Flagged | 9 | |
| 7 | 4 | 9 | Chris Cord | Chevrolet Camaro | 30 | Flagged | 8 | ||
| 8 | 3 | 10 | Bobby Rahal | Chevrolet Camaro | 30 | Flagged | 7 | ||
| 9 | 8 | 5 | Geoff Bodine | Chevrolet Camaro | 29 | Flagged | 6 | ||
| 10 | 12 | 1 | Bill Elliott | Chevrolet Camaro | Yellow | 29 | Flagged | 5 | |
| 11 | 1 | 12 | Roberto Guerrero | Chevrolet Camaro | 10 | Crash | 4 | ||
| 12 | 11 | 2 | Dale Earnhardt | Chevrolet Camaro | 10 | 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: 2 sec
Lead changes: 1
Lap Leader Breakdown
| Driver | From Lap | To Lap | Number of Laps |
| Chip Robinson | 1 | 20 | 20 |
| Scott Pruett | 21 | 30 | 10 |
Race Three, Michigan International Speedway
Saturday, August 6, 1988| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points |
| 1 | 3 | 9 | Geoff Bodine | Chevrolet Camaro | Yellow | 50 | 0:37:38 | 46 | 26 ' |
| 2 | 6 | 6 | Dale Earnhardt | Chevrolet Camaro | 50 | Flagged | 17 | ||
| 3 | 8 | 4 | Al Unser, Jr. | Chevrolet Camaro | Lime | 50 | Flagged | 14 | |
| 4 | 7 | 5 | Terry Labonte | Chevrolet Camaro | 50 | Flagged | 12 | ||
| 5 | 4 | 8 | Al Unser | Chevrolet Camaro | 50 | Flagged | 10 | ||
| 6 | 5 | 7 | Al Holbert | Chevrolet Camaro | White | 50 | Flagged | 9 | |
| 7 | 10 | 2 | Bill Elliott | Chevrolet Camaro | Silver | 50 | Flagged | 8 | |
| 8 | 2 | 11 | Bobby Rahal | Chevrolet Camaro | 50 | Flagged | 7 | ||
| 9 | 11 | 1 | Scott Pruett | Chevrolet Camaro | Pink | 50 | Flagged | 6 | |
| 10 | 1 | 12 | Roberto Guerrero | Chevrolet Camaro | Tan | 50 | Flagged | 4 | 8 ' |
| 11 | 9 | 3 | Chip Robinson | Chevrolet Camaro | 50 | Flagged | 4 | ||
| 12 | X | 10 | Chris Cord | Chevrolet Camaro | Not assigned | 0 | Did not start, Injured | 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: 0.78 sec
Lead changes: 1
Lap Leader Breakdown
| Driver | From Lap | To Lap | Number of Laps |
| Roberto Guerrero | 1 | 4 | 4 |
| Geoff Bodine | 5 | 50 | 46 |
Race Four, Watkins Glen International
Saturday, August 13, 1988| Finish | Grid | Car no. | Driver | Car Make | Car Color | Laps | Status | Laps Led | Points |
| 1 | 2 | 2 | Al Unser, Jr. | Chevrolet Camaro | Silver | 30 | 0:39:22 | 30 | 26 ' |
| 2 | 4 | 4 | Terry Labonte | Chevrolet Camaro | Lime | 30 | Flagged | 17 | |
| 3 | 6 | 6 | Scott Pruett | Chevrolet Camaro | White | 30 | Flagged | 14 | |
| 4 | 9 | 9 | Al Holbert | Chevrolet Camaro | 30 | Flagged | 12 | ||
| 5 | 8 | 8 | Al Unser | Chevrolet Camaro | 30 | Flagged | 10 | ||
| 6 | 11 | 11 | Chris Cord | Chevrolet Camaro | 30 | Flagged | 9 | ||
| 7 | 5 | 5 | Dale Earnhardt | Chevrolet Camaro | 30 | Flagged | 8 | ||
| 8 | 3 | 3 | Bill Elliott | Chevrolet Camaro | 30 | Flagged | 7 | ||
| 9 | 7 | 7 | Chip Robinson | Chevrolet Camaro | Powder Blue | 29 | Flagged | 6 | |
| 10 | 10 | 10 | Bobby Rahal | Chevrolet Camaro | 29 | Flagged | 5 | ||
| 11 | 12 | 12 | Roberto Guerrero | Chevrolet Camaro | 20 | Flagged | 4 | ||
| 12 | 1 | 1 | Geoff Bodine | Chevrolet Camaro | Gold | 16 | 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: 3
Margin of victory: 1.58 sec
Lead changes: 0