IROC XII was the twelfth year of IROC competition took place in 1988. It 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 $211,900.
The roster of drivers and final points standings were as follows:
Friday, February 12, 1988
(5) Indicates 5 bonus points added to normal race points scored for leading the most laps.<br>(3) Indicates 3 bonus points added to normal race points scored for leading the 2nd most laps (did not occur in this race so not awarded).<br>(2) Indicates 2 bonus points added to normal race points scored for leading the 3rd most laps (did not occur in this race so not awarded).
Average speed: <br>Cautions: 1<br>Margin of victory: 2 cl<br>Lead changes: 0
Saturday, June 11, 1988
(5) Indicates 5 bonus points added to normal race points scored for leading the most laps.<br>(3) Indicates 3 bonus points added to normal race points scored for leading the 2nd most laps<br>(2) Indicates 2 bonus points added to normal race points scored for leading the 3rd most laps (did not occur in this race so not awarded).
Average speed: <br>Cautions: 2<br>Margin of victory: 2 sec<br>Lead changes: 1 Lap Leader Breakdown
Saturday, August 6, 1988
(5) Indicates 5 bonus points added to normal race points scored for leading the most laps.<br>(3) Indicates 3 bonus points added to normal race points scored for leading the 2nd most laps<br>(2) Indicates 2 bonus points added to normal race points scored for leading the 3rd most laps (did not occur in this race so not awarded).
Average speed: <br>Cautions: none<br>Margin of victory: 0.78 sec<br>Lead changes: 1 Lap Leader Breakdown
Saturday, August 13, 1988
(5) Indicates 5 bonus points added to normal race points scored for leading the most laps.<br>(3) Indicates 3 bonus points added to normal race points scored for leading the 2nd most laps (did not occur in this race so not awarded).<br>(2) Indicates 2 bonus points added to normal race points scored for leading the 3rd most laps (did not occur in this race so not awarded).
Average speed: <br>Cautions: 3<br>Margin of victory: 1.58 sec<br>Lead changes: 0