| 5.2.1989 | 24 h Daytona | 83 | #88-01 | Luyendyk / Robinson / Brabham / Roe | Electramotive Engineering | 27th |
| 5.2.1989 | 24 h Daytona | 84 | #88-03 | Roe | Electramotive Engineering | 61st |
| 5.3.1989 | 3 h Miami | 83 | #88-01 | Brabham / Robinson | Electramotive Engineering | 1st |
| 5.3.1989 | 3 h Miami | 84 | | Brabham / Robinson / Devendorf | Electramotive Engineering | DNS |
| 18.3.1989 | 12 h Sebring | 83 | #88-01 | Robinson / Brabham / Luyendyk | Electramotive Engineering | 1st |
| 18.3.1989 | 12 h Sebring | 84 | #88-03 | Luyendyk | Electramotive Engineering | 52nd |
| 2.4.1989 | 500 km Road Atlanta | 83 | #88-01 | Brabham / Robinson | Electramotive Engineering | 1st |
| 2.4.1989 | 500 km Road Atlanta | 84 | | Brabham / Robinson | Electramotive Engineering | DNS |
| 23.4.1989 | 3 h West Palm Beach | 83 | #88-01 | Geoff Brabham | Electramotive Engineering | 21st |
| 23.4.1989 | 3 h West Palm Beach | 84 | #88-03 | Brabham / Robinson | Electramotive Engineering | 6th |
| 29.5.1989 | 150 lap Lime Rock | 83 | #88-01 | Chip Robinson | Electramotive Engineering | 4th |
| 29.5.1989 | 150 lap Lime Rock | 84 | #88-03 | Geoff Brabham | Electramotive Engineering | 1st |
| 4.6.1989 | 500 km Mid-Ohio | 83 | #88-01 | Brabham / Robinson | Electramotive Engineering | 1st |
| 2.7.1989 | 500 km Watkins Glen | 83 | #88-01 | Brabham / Robinson | Electramotive Engineering | DNS |
| 2.7.1989 | 500 km Watkins Glen | 84 | #88-03 | Brabham / Robinson | Electramotive Engineering | 1st |
| 16.7.1989 | 500 km Road America | 83 | #88-01 | Brabham / Robinson | Electramotive Engineering | 1st |
| 16.7.1989 | 500 km Road America | 84 | | Brabham / Robinson / Devendorf | Electramotive Engineering | DNS |
| 30.7.1989 | 300 km Portland | 83 | #88-01 | Geoff Brabham | Electramotive Engineering | 2nd |
| 30.7.1989 | 300 km Portland | 84 | #88-03 | Chip Robinson | Electramotive Engineering | 3rd |
| 13.8.1989 | 300 km Topeka | 83 | #88-01 | Geoff Brabham | Electramotive Engineering | 1st |
| 13.8.1989 | 300 km Topeka | 84 | #88-04 | Chip Robinson | Electramotive Engineering | 2nd |
| 3.9.1989 | 2 h San Antonio | 83 | #88-01 | Geoff Brabham | Electramotive Engineering | 15th |
| 3.9.1989 | 2 h San Antonio | 84 | #88-04 | Chip Robinson | Electramotive Engineering | 1st |
| 10.9.1989 | 300 km Sears Point | 83 | #88-01 | Geoff Brabham | Electramotive Engineering | 1st |
| 10.9.1989 | 300 km Sears Point | 84 | #88-04 | Chip Robinson | Electramotive Engineering | 2nd |
| 1.10.1989 | 360 km Tampa | 83 | #88-01 | Geoff Brabham | Electramotive Engineering | 6th |
| 1.10.1989 | 360 km Tampa | 84 | #88-04 | Chip Robinson | Electramotive Engineering | 4th |
| 22.10.1989 | 2 h Del Mar | 83 | #88-01 | Brabham | Electramotive Engineering | 2nd |
| 22.10.1989 | 2 h Del Mar | 84 | #88-04 | Robinson | Electramotive Engineering | 17th |