All cars powered by Volkswagen

1971 (Champion: Bill Scott)
1. Daytona, Jul 3-Bill Scott (USA)-Royale RP9
2. Road Atlanta, Jul 11-Tom Reddy (USA)-Lola T250
3. Talladega, Aug 21-Tom Davey (USA)-Lola T250
4. Road America, Aug 29-Bill Scott (USA)-Royale RP9
5. Lime Rock, Sep 6-Bill Scott (USA)-Royale RP9
6. Riverside, Oct 3-Elliott Forbes-Robinson (USA)-Zeitler Mk1
7. Laguna Seca, Oct 17-Bill Scott (USA)-Royale RP9

1972 (Champion: Bill Scott)
1. Sebring, Mar 24-Gregor Kronegard (S)-Lola T252
2. Watkins Glen, Jun 18-Bill Scott (USA)-Royale RP14
3. Road Atlanta, Jul 9-Harry Ingle (USA)-Zink Z-9
4. Brainerd, Jul 29-Steve Pieper (USA-Royale RP9
5. Road America, Aug 27-Bill Scott (USA)-Royale RP14
6. Lime Rock, Sep 4-Tom Reddy (USA)-Lola T252
7. Portland, Sep 17-Elliott Forbes-Robinson (USA)-Lola T252
8. Laguna Seca, Oct 15-Jon Woodner (USA)-Tui BH3
9. Riverside, Oct 29-Elliott Forbes-Robinson (USA)-Lola T252

1973 (Champion: Bertil Roos)
1. Lime Rock, May 5-Bertil Roos (S)-Tui BH3
2. Watkins Glen, May 16-Bertil Roos (S)-Tui BH3
3. Road Atlanta, Jul 8-Harry Ingle (USA)-Royale RP14
4. Watkins Glen, Jul 22-Bertil Roos (S)-Tui BH3
5. Road Atlanta, Aug 26-Bob Wheelock (USA)-Lola T252
6. Pocono, Sep 3-Bob Lazier (USA)-Royale RP18
7. Seattle, Sep 30-Elliott Forbes-Robinson (USA)-Lola T252
8. Laguna Seca, Oct 14-Elliott Forbes-Robinson (USA)-Lola T252
9. Riverside, Oct 28-Bob Lazier (USA)-Royale RP18

1974 (Champion: Elliott Forbes-Robinson)
1. Road Atlanta, Apr 21-Tom Bagley (USA)-Royale RP9
2. Lime Rock, May 4-Elliott Forbes-Robinson (USA)-Lola T320
3. Laguna Seca, May 12-Elliott Forbes-Robinson (USA)-Lola T320
4. Ontario (CDN), May 19-Hurley Haywood (USA)-Tui BH3
5. Mid-Ohio, Jun 30-Tom Bagley (USA)-Royale RP9
6. Road Atlanta, Jul 7-Elliott Forbes-Robinson (USA)-Lola T320
7. Watkins Glen, Jul 14-Bob Lazier (USA)-Lola T322
8. Charlotte, Aug 18-Elliott Forbes-Robinson (USA)-Lola T320
9. Road America, Aug 25-Fred Phillips (USA)-Elden Mk10
10. Lime Rock, Sep 2-Harry Ingle (USA)-Zink Z11
11. Mosport (CDN), Sep 22-Elliott Forbes-Robinson (USA)-Lola T320
12. Watkins Glen, Oct 6-Elliott Forbes-Robinson (USA)-Lola T320
13. Mexico City (MEX), Oct 20-Elliott Forbes-Robinson (USA)-Lola T320
14. Daytona, Dec 1-Freddy Kottulinsky (S)-Lola T322

1975 (Champion: Eddie Miller)
1. Daytona, Feb 1-Tom Bagley (USA)-Zink Z11
2. Sebring, Mar 21-Howdy Holmes (USA)-Lola T322
3. Road Atlanta, Apr 20-Eddie Miller (USA)-Lola T324
4. Laguna Seca, May 4-Fred Phillips (USA)-Elden Mk14
5. Riverside, May 10-Eddie Miller (USA)-Lola T324
6. Lime Rock, May 26-Eddie Miller (USA)-Lola T324
7. Watkins Glen, Jul 13-Tom Bagley (USA-Zink Z10
8. Road America, Aug 23-Eddie Miller (USA)-Lola T324
9. Mosport (CDN), Sep 21-Eddie Miller (USA)-Lola T324
10. Watkins Glen, Oct 4-Tom Bagley (USA-Zink Z11
11. Daytona, Nov 30-Herm Johnson (USA)-Lola T324

1976 (Champion: Tom Bagley)
1. Daytona, Jan 31-Tom Bagley (USA)-Zink Z11
2. Pocono, May 9-Bertil Roos (S)-Lola T324
3. Nelson Ledges, May 31-Tom Bagley (USA)-Zink Z11
4. Mosport (CDN), Jun 20-William Henderson (USA)-Lola T320/4
5. Watkins Glen, Jul 11-Bob Lazier (USA)-Lola T324
6. Mid-Ohio, Aug 8-Bob Lazier (USA)-Lola T324
7. Brainerd, Aug 15-Tom Bagley (USA)-Zink Z11
8. Road America, Aug 29-Tom Bagley (USA)-Zink Z11
9. Watkins Glen, Oct 10-Tom Bagley (USA)-Zink Z11

1977 (Champion: Bob Lazier)
1. Seattle, May 30-Bob Lazier (USA)-Lola T324
2. Nelson Ledges, Jun 26-Bob Lazier (USA)-Lola T324
3. Watkins Glen, Jul 10-Bob Lazier (USA)-Lola T324
4. Road Atlanta, Jul 23-Bob Lazier (USA)-Lola T324
5. Hallett, Jul 31-Tom Bagley (USA)-Zink Z11
6. Mid-Ohio, Aug 7-Bob Lazier (USA)-Lola T324
7. Brainerd, Aug 14-Herm Johnson (USA)-Lola T324
8. St Jovite, Sep 11-Stuart Moore (USA)-Lola T324
9. Watkins Glen, Oct 1-Tom Bagley (USA)-Zink Z11
10. Mosport (CDN), Oct 9-Bob Lazier (USA)-Lola T324

1978 (Champion: Bill Alsup)
1. Charlotte, Apr 16-Bill Alsup (USA)-Argo JM2
2. Road Atlanta, May 14-Bill Alsup (USA)-Argo JM2
3. Mid-Ohio, Jun 11-Bob Lazier (USA)-Lola T620
4. St Jovite, Jun 25-Bill Alsup (USA)-Argo JM2
5. Watkins Glen, Jul 9-Bill Alsup (USA)-Argo JM2
6. Brainerd, Aug 13-Herm Johnson (USA)-Lola T620
7. Road America, Sep 4-Herm Johnson (USA)-Lola T620
8. Watkins Glen, Sep 30-Herm Johnson (USA)-Lola T620

1979 (Champion: Geoff Brabham)
1. Road Atlanta, May 6-Geoff Brabham (AUS)-Ralt RT1
2. Charlotte, May 20-Geoff Brabham (AUS)-Ralt RT1
3. Mosport, Jun 3-Geoff Brabham (AUS)-Ralt RT1
4. Watkins Glen, Jul 8-Geoff Brabham (AUS)-Ralt RT1
5. Michigan, Jul 15-Mike Chandler (USA)-Ralt RT1
6. Road America, Jul 21-Herm Johnson (USA)-Ralt RT1
7. Brainerd, Aug 19-Herm Johnson (USA)-Ralt RT1
8. Watkins Glen, Oct 6-Geoff Brabham (AUS)-Ralt RT1

1980 (Champion: Peter Kuhn)
1. Charlotte, May 18-Bob Earl (USA)-Ralt RT1
2. Milwaukee, Jun 8-Billy Scyphers Jr (USA)-Ralt RT5
3. Pocono, Jun 22-Josele Garza (MEX)-Ralt RT5
4. Watkins Glen, Jul 6-Dave McMillan (USA)-Ralt RT5
5. Mid-Ohio, Jul 13-Dave McMillan (USA)-Ralt RT5
6. Road America, Jul 20-Peter Kuhn (USA)-Ralt RT5
7. Brainerd, Aug 10-Peter Kuhn (USA)-Ralt RT5
8. St Paul, Race 1 (Aug 23)-Peter Kuhn (USA)-Ralt RT5
9. St Paul, Race 2 (Aug 24)-Peter Kuhn (USA)-Ralt RT5
10. Ontario, Aug 30-Pete Halsmer (USA)-Ralt RT1
11. Michigan, Sep 20-Peter Kuhn (USA)-Ralt RT5
12. Watkins Glen, Oct 5-Herm Johnson (USA)-Ralt RT5
13. Riverside, Oct 26-Bob Earl (USA)-Ralt RT5
14. Phoenix, Nov 8-Al Unser Jr (USA)-Ralt RT5

1981 (Champion: Al Unser Jr)
1. Charlotte, May 17-Al Unser Jr (USA)-Ralt RT5
2. Milwaukee, Jun 7-Al Unser Jr (USA)-Ralt RT5
3. Watkins Glen, Jul 11-Pete Halsmer (USA)-Ralt RT5
4. Road America, Jul 25-Pete Halsmer (USA)-Ralt RT5
5. Brainerd, Aug 9-Al Unser Jr (USA)-Ralt RT5
6. Milwaukee, Sep 6-Al Unser Jr (USA)-Ralt RT5
7. Michigan, Sep 19-Bob Cicconi (USA)-Ralt RT5
8. Riverside, Oct 4-Bob Earl (USA)-Ralt RT5
9. Phoenix, Oct 31-Pete Halsmer (USA)-Ralt RT5

1982 (Champion: Michael Andretti)
1. Phoenix, Mar 28-Michael Andretti (USA)-Ralt RT5
2. Charlotte, May 26-Michael Andretti (USA)-Ralt RT5
3. Detroit, Jun 5-Jerrill Rice (USA)-Ralt RT5
4. Milwaukee, Jun 13-Ed Pimm (USA)-Ralt RT5
5. Road America, Jul 25-Peter Moodie (USA)-Anson SA3V
6. Milwaukee, Aug 1-Michael Andretti (USA)-Ralt RT5
7. Mosport (CDN), Sep 12-Michael Andretti (USA)-Ralt RT5
8. Michigan, Sep 26-Mike Miller (USA)-Ralt RT5
9. Riverside, Oct 3-Michael Andretti (USA)-Ralt RT5
10. Laguna Seca, Oct 10-Davy Jones (USA)-Ralt RT5
11. Phoenix, Nov 6-Michael Andretti (USA)-Ralt RT5

1983 (Champion: Ed Pimm)
1. Long Beach, Mar 26-Michael Andretti (USA)-Ralt RT5
2. Mosport (CDN), Jun 5-Price Cobb (USA)-Ralt RT5
3. Milwaukee, Jun 12-Ed Pimm (USA)-Anson SA4
4. Cleveland, Jul 3-Price Cobb (USA)-Ralt RT5
5. Road America, Jul 31-Price Cobb (USA)-Ralt RT5
6. Pocono, Aug 13-Ed Pimm (USA)-Anson SA4
7. Mid-Ohio, Sep 11-Ed Pimm (USA)-Anson SA4
8. Michigan, Sep 18-Ed Pimm (USA)-Anson SA4
9. Riverside, Sep 25-Ed Pimm (USA)-Anson SA4
10. Laguna Seca, Oct 23-Price Cobb (USA)-Ralt RT5
11. Phoenix, Oct 30-Ludwig Heimrath Jr (CDN)-Ralt RT5

1984 (Champion: Arie Luyendyk)
1. Long Beach, Apr 1-Chip Robinson (USA)-Ralt RT5
2. Phoenix, Apr 15-Ludwig Heimrath Jr (CDN)-Ralt RT5
3. Milwaukee, Jun 3-Arie Luyendyk (NL)-Ralt RT5
4. Portland, Jun 17-Ludwig Heimrath Jr (CDN)-Ralt RT5
5. Meadowlands, Jul 1-Chip Robinson (USA)-Ralt RT5
6. Cleveland, Jul 8-Arie Luyendyk (NL)-Ralt RT5
7. Road America, Aug 5-Chip Robinson (USA)-Ralt RT5
8. Watkins Glen, Aug 19-Arie Luyendyk (NL)-Ralt RT5
9. Trois-Rivieres, Sep 2-Arie Luyendyk (NL)-Ralt RT5
10. Michigan. Sep 24-Jeff McPherson (USA)-Ralt RT5
11. Laguna Seca, Oct 21-Ted Prappas (USA)-Ralt RT5
12. Las Vegas, Nov 11-Ludwig Heimrath Jr (CDN)-Ralt RT5

1985 (Champion: Ken Johnson)
1. Long Beach, Apr 13-Davy Jones (USA)-Ralt RT5
2. Indianapolis Raceway Park, May 25-Mike Hooper (USA)-Ralt RT5
3. Milwaukee, Jun 2-Jeff Andretti (USA)-Ralt RT5
4. Detroit, Jun 23-Hans-Peter Pandur (USA)-Ralt RT5
5. Meadowlands, Jun 30-Ken Johnson (USA)-Ralt RT5
6. Cleveland, Jul 7-Jeff Andretti (USA)-Ralt RT5
7. Road America, Aug 3-Davy Jones (USA)-Ralt RT5
8. Watkins Glen, Aug 25-Didier Theys (B)-Martini Mk47
9. Mid-Ohio, Sep 1-Mike Groff (USA)-Ralt RT5
10. Sanair (CDN), Sep 8-Mike Groff (USA)-Ralt RT5
11. Laguna Seca, Oct 6-Davy Jones (USA)-Ralt RT5
12. Phoenix, Oct 13-Jeff Andretti (USA)-Ralt RT5

1986 (Champion: Didier Theys)
1. Long Beach, Apr 12-Steve Bren (USA)-Ralt RT5
2. Indianapolis Raceway Park, May 24-Didier Theys (B)-Martini Mk47
3. Milwaukee, Jun 7-Mike Groff (USA)-Ralt RT5
4. Detroit, Jun 22-Scott Atchison (USA)-Ralt RT5
5. Meadowlands, Jun 28-Didier Theys (B)-Martini Mk47
6. Cleveland, Jul 6-Didier Theys (B)-Martini Mk50
7. Road America, Jul 27-Thomas Knapp (USA)-Ralt RT5
8. Mid-Ohio, Aug 31-Steve Bren (USA)-Ralt RT5
9. Road America, Sep 21-Thomas Knapp (USA)-Ralt RT5
10. Laguna Seca, Oct 12-Steve Bren (USA)-Ralt RT5
11. Phoenix, Oct 19-Mike Groff (USA)-Ralt RT5
12. Miami, Nov 9-Didier Theys (B)-Martini Mk50
13. St Petersburg, Nov 16-Didier Theys (B)-Martini Mk50

1987 (Champion: Scott Atchison)
1. Long Beach, Apr 5-Steve Bren (USA)-Ralt RT5
2. Phoenix, Apr 12-Ken Johnson (USA)-Ralt RT5
3. Indianapolis Raceway Park, May 23-EJ Lenzi (USA)-Ralt RT5
4. Milwaukee, May 31-Scott Atchison (USA)-Ralt RT5
5. Detroit, Jun 21-Paul Radisich (NZ)-Ralt RT5
6. Meadowlands, Jun 27-Scott Atchison (USA)-Ralt RT5
7. Cleveland, Jul 5-Scott Atchison (USA)-Ralt RT5
8. Road America, Aug 30-David Kudrave (USA)-Ralt RT5
9. Mid-Ohio, Sep 6-David Kudrave (USA)-Ralt RT5
10. Nazareth, Sep 20-Scott Atchison (USA)-Ralt RT5
11. Miami, Nov 1-Ken Johnson (USA)-Ralt RT5
12. St Petersburg, Nov 8-David Kudrave (USA)-Ralt RT5

1988 (Champion: Ken Murillo)
1. Phoenix, Apr 10-Ken Murillo (USA)-Ralt RT5
2. Long Beach, Apr 17-Paul Radisich (NZ)-Ralt RT5
3. Dallas, May 1-May 1-Bernard Jourdain (MEX)-Ralt RT5
4. Indianapolis Raceway Park, May 28-Mike Smith (USA)-Ralt RT5
5. Milwaukee, Jun 4-Robbie Groff (USA)-Ralt RT5
6. Detroit, Jun 19-Paul Radisich (NZ)-Ralt RT5
7. Niagara Falls, Jun 26-Paul Radisich (NZ)-Ralt RT5
8. Cleveland, Jul 2-Paul Radisich (NZ)-Ralt RT5
9. Meadowlands, Jul 24-Mark Smith (USA)-Ralt RT5
10. Mid-Ohio, Sep 4-Ken Murillo (USA)-Ralt RT5
11. Road America, Sep 11-Robbie Groff (USA)-Ralt RT5
12. Nazareth, Sep 24-Ken Murillo (USA)-Ralt RT5
13. St Petersburg, Oct 22-Bernard Jourdain (MEX)-Ralt RT5

1989 (Champion: Mark Smith)
1. Phoenix, Apr 9-Robbie Groff (USA)-Ralt RT5
2. Dallas, May 14-Kim Campbell (USA)-Ralt RT5
3. Indianapolis Raceway Park, May 27-Mark Smith (USA)-Ralt RT5
4. Milwaukee, Jun 3-Mark Smith (USA)-Ralt RT5
5. Cleveland, Jul 2-Robbie Groff (USA)-Ralt RT5
6. Des Moines, Jul 9-Mark Smith (USA)-Ralt RT5
7. Road Atlanta, Aug 20-Mark Smith (USA)-Ralt RT5
8. Mid-Ohio, Sep 3-Mark Smith (USA)-Ralt RT5
9. Road America, Sep 9-Harald Huysman (N)-Ralt RT5
10. Nazareth, Sep 24-Robbie Groff (USA)-Ralt RT5
11. St Petersburg, Oct 28-Stuart Crow (USA)-Ralt RT5

1990 (Champion: Stuart Crow)
1. Phoenix, Apr 8-Stuart Crow (USA)-Ralt RT5
2. Milwaukee, Jun 2-Stuart Crow (USA)-Ralt RT5
3. Cleveland, Jul 8-Chris Smith (USA)-Ralt RT5
4. Des Moines, Jul 15-Chris Smith (USA)-Ralt RT5
5. Road Atlanta, Jul 29-Chris Smith (USA)-Ralt RT5
6. Mid-Ohio, Sep 16-Byron Payne (USA)-Ralt RT5
7. Road America, Sep 22-Kim Campbell (USA)-Ralt RT5
8. Nazareth, Oct 6-Stuart Crow (USA)-Ralt RT5
9. St Petersburg, Nov 3-Chris Smith (USA)-Ralt RT5

Total races: 212

Winning drivers

12 wins-Tom Bagley, Elliott Forbes-Robinson, Bob Lazier
8 wins-Herm Johnson
7 wins-Michael Andretti
6 wins-Ed Pimm, Bill Scott, Mark Smith, Didier Theys
5 wins-Scott Atchison, Geoff Brabham, Robbie Groff, Peter Kuhn, Eddie Miller, Paul Radisich, Al Unser Jr
4 wins-Bill Alsup, Steve Bren, Price Cobb, Stuart Crow, Mike Groff, Pete Halsmer, Ludwig Heimrath Jr, Davy Jones, Arie Luyendyk, Bertil Roos, Chris Smith
3 wins-Jeff Andretti, Bob Earl, Harry Ingle, Ken Johnson, David Kudrave, Ken Murillo, Chip Robinson
2 wins-Kim Campbell, Bernard Jourdain, Thomas Knapp, Dave McMillan, Fred Phillips, Tom Reddy
1 win-Mike Chandler, Bob Cicconi, Tom Davey, Josele Garza, Hurley Haywood, William Henderson, Howdy Holmes, Mike Hooper, Harald Huysman, Freddy Kottulinsky, Gregor Kronegard, EJ Lenzi, Jeff McPherson, Mike Miller, Peter Moodie, Stuart Moore, Hans-Peter Pandur, Byron Payne, Steve Pieper, Ted Prappas, Jerrill Rice, Billy Scyphers Jr, Mike Smith, Bob Wheelock, Jon Woodner

Total winning drivers: 65

Winning nationalities

Australia-1 driver (Brabham)
Belgium-1 driver (Theys)
Canada-1 driver (Heimrath Jr)
Holland-1 driver (Luyendyk)
Mexico-2 drivers (Garza, Jourdain)
New Zealand-1 driver (Radisich)
Norway-1 driver (Huysman)
Sweden-3 drivers (Kottulinsky, Kronegard, Roos)
United States-54 drivers (Alsup, J Andretti, M Andretti, Atchison, Bagley, Bren, Campbell, Chandler, Cicconi, Cobb, Crow, Davey, Earl, Forbes-Robinson, M Groff, R Groff, Halsmer, Haywood, Henderson, Holmes, Hooper, Ingle, H Johnson, K Johnson, Jones, Knapp, Kudrave, Kuhn, Lazier, Lenzi, McMillan, McPherson, E Miller, M Miller, Moodie, Moore, Murillo, Pandur, Payne, Phillips, Pieper, Pimm, Prappas, Reddy, Rice, Robinson, Scott, Scyphers Jr, C Smith, Mark Smith, Mike Smith, Unser Jr, Wheelock, Woodner)

Total winning nationalities: 8

Winning manufacturers

123 wins-Ralt
41 wins-Lola
12 wins-Royale, Zink
6 wins-Anson, Martini
5 wins-Tui
4 wins-Argo
2 wins-Elden
1 win-Zeitler

Total wins: 212 by 10 manufacturers