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:^[1]

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

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 (5)
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	Rose	40	Flagged		12
5	7	12	Geoff Bodine	Chevrolet Camaro	Red	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	Grey	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	Dark Blue	37	Flagged		4
12	12	??	Roberto Guerrero	Chevrolet Camaro	Aqua	0	Did Not Start, Injured		3

(5) Indicates 5 bonus points added to normal race points scored for leading the most laps.
(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).
(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: 186.239 mph (299.723 km/h)
Cautions: 1
Margin of victory: 2 cl
Lead changes: 0

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 (3)
2	2	11	Chip Robinson	Chevrolet Camaro	Orange	30	Flagged	20	22 (5)
3	9	4	Al Unser Jr.	Chevrolet Camaro	Dark Orange	30	Flagged		14
4	10	3	Terry Labonte	Chevrolet Camaro	Lime	30	Flagged		12
5	6	7	Al Holbert	Chevrolet Camaro	Dark Purple	30	Flagged		10
6	7	6	Al Unser	Chevrolet Camaro	Silver	30	Flagged		9
7	4	9	Chris Cord	Chevrolet Camaro	Aqua	30	Flagged		8
8	3	10	Bobby Rahal	Chevrolet Camaro	Medium Blue	30	Flagged		7
9	8	5	Geoff Bodine	Chevrolet Camaro	Red	29	Flagged		6
10	12	1	Bill Elliott	Chevrolet Camaro	Yellow	29	Flagged		5
11	1	12	Roberto Guerrero	Chevrolet Camaro	Purple	10	Crash		4
12	11	2	Dale Earnhardt	Chevrolet Camaro	Bronze	10	Crash		3

(5) Indicates 5 bonus points added to normal race points scored for leading the most laps.
(3) Indicates 3 bonus points added to normal race points scored for leading the 2nd most laps
(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: 98.182 mph (158.009 km/h)
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

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 (5)
2	6	6	Dale Earnhardt	Chevrolet Camaro	Dark Blue	50	Flagged		17
3	8	4	Al Unser Jr.	Chevrolet Camaro	Lime	50	Flagged		14
4	7	5	Terry Labonte	Chevrolet Camaro	Orange	50	Flagged		12
5	4	8	Al Unser	Chevrolet Camaro	Blue	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	Aqua	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 (3)
11	9	3	Chip Robinson	Chevrolet Camaro	Black	50	Flagged		4
12	X	10	Chris Cord	Chevrolet Camaro	Not assigned	0	Did Not Start, Injured		3

(5) Indicates 5 bonus points added to normal race points scored for leading the most laps.
(3) Indicates 3 bonus points added to normal race points scored for leading the 2nd most laps
(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: 159.432 mph (256.581 km/h)
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

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 (5)
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	Blue	30	Flagged		12
5	8	8	Al Unser	Chevrolet Camaro	Aqua	30	Flagged		10
6	11	11	Chris Cord	Chevrolet Camaro	Orange	30	Flagged		9
7	5	5	Dale Earnhardt	Chevrolet Camaro	Red	30	Flagged		8
8	3	3	Bill Elliott	Chevrolet Camaro	Rose	30	Flagged		7
9	7	7	Chip Robinson	Chevrolet Camaro	Powder Blue	29	Flagged		6
10	10	10	Bobby Rahal	Chevrolet Camaro	Purple	29	Flagged		5
11	12	12	Roberto Guerrero	Chevrolet Camaro	Dark Blue	20	Flagged		4
12	1	1	Geoff Bodine	Chevrolet Camaro	Gold	16	Crash		3

(5) Indicates 5 bonus points added to normal race points scored for leading the most laps.
(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).
(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: 110.924 mph (178.515 km/h)
Cautions: 3
Margin of victory: 1.58 sec
Lead changes: 0

1. Dale Earnhardt and Geoff Bodine tied for fifth place in the championship standings, but Earnhardt was awarded the position due to a higher finishing position in the final race.

• IROC XII History - IROC Website