1998 (Champion: James Weaver)
1. Daytona 24H (USA), Jan 31-Feb 1-Mauro Baldi (I)/Arie Luyendyk (NL)/Giampiero Moretti (I)/Didier Theys (B)-Doran-Moretti Racing Ferrari 333SP #30
2. Homestead (USA, May 17-Butch Leitzinger (USA)/James Weaver (GB)-Dyson Racing Riley & Scott-Ford MkIII #16
3. Mid-Ohio (USA), Jun 14-Elliott Forbes-Robinson (USA)/Dorsey Schroeder (USA)-Dyson Racing Riley & Scott MkIII-Ford #20
4. Minneapolis (USA), Jun 28-Butch Leitzinger (USA)/James Weaver (GB)-Dyson Racing Riley & Scott-Ford MkIII #16
5. Watkins Glen (USA), Aug 23-Mauro Baldi (I)/Giampiero Moretti (I)/Didier Theys (B)-Doran-Moretti Racing Ferrari 333SP #30

1999 (Champions: Elliott Forbes-Robinson/Butch Leitzinger)
1. Daytona 24H (USA), Jan 30-31-Elliott Forbes-Robinson (USA)/Butch Leitzinger (USA)/Andy Wallace (GB)-Dyson Racing Riley & Scott MkIII-Ford #20
2. Lime Rock (USA), May 31-Fredy Lienhard (CH)/Didier Theys (B)-Doran Lista Ferrari 333SP #27
3. Mid-Ohio (USA), Jun 6-Andy Wallace (GB)/James Weaver (GB)-Dyson Racing Riley & Scott MkIII-Ford #16

Total races: 8

Winning drivers

3 wins-Butch Leitzinger, Didier Theys, James Weaver
2 wins-Mauro Baldi, Elliott Forbes-Robinson, Giampiero Moretti, Andy Wallace
1 win-Fredy Lienhard, Arie Luyendyk, Dorsey Schroeder

Total winning drivers: 10

Winning nationalities

Belgium-1 driver (Theys)
Great Britain-2 drivers (Wallace, Weaver)
Holland-1 driver (Luyendyk)
Italy-2 drivers (Baldi, Moretti)
Switzerland-1 driver (Lienhard)
United States-3 drivers (Forbes-Robinson, Leitzinger, Schroeder)

Total winning nationalities: 6

Championships

1 title-Elliott Forbes-Robinson, Butch Leitzinger, James Weaver

Total champions: 3

Winning manufacturers

5 wins-Riley & Scott
3 wins-Ferrari

Total wins: 8 by 2 manufacturers

Winning engines

5 wins-Ford
3 wins-Ferrari

Total wins: 8 by 2 manufacturers

Winning teams

5 wins-Dyson Racing
3 wins-Doran-Moretti (Doran Lista)

Total wins: 8 by 2 teams