| 1.4.1973 | Interserie Nürburgring 300 | 1 | #004 | Leo Kinnunen | Motorsportclub Stuttgart - Racing Team AAW | 2nd |
| 1.4.1973 | Interserie Nürburgring 300 | 2 | #015 | Willi Kauhsen | Willi Kauhsen Racing Team | 1st |
| 1.4.1973 | Interserie Nürburgring 300 | 6 | #017 | Georg Loos | GELO-Racing-Team | 6th |
| 1.4.1973 | Interserie Nürburgring 300 | 16 | #003 | George Follmer | Rinzler Motorracing Inc. | 17th |
| 1.5.1973 | Interserie Imola | 1 | #004 | Leo Kinnunen | Motorsport-Club Stuttgart/Racing Team AAW | 2nd |
| 1.5.1973 | Interserie Imola | 2 | #015 | Willi Kauhsen | Willi Kauhsen Racing Team | 1st |
| 1.5.1973 | Interserie Imola | 6 | #017 | Georg Loos | Gelo Racing Team | 3rd |
| 1.5.1973 | Interserie Imola | 11 | #001 | Charlie Kemp | Rinzler Motor Racing Inc. | 8th |
| 1.5.1973 | Interserie Imola | 16 | #003 | George Follmer | Rinzler RC Cola | 11th |
| 20.5.1973 | Interserie Silverstone | 1 | #004 | Leo Kinnunen | Motorsport-Club Stuttgart/Racing Team AAW | 1st |
| 20.5.1973 | Interserie Silverstone | 2 | #015 | Willi Kauhsen | Willi Kauhsen Racing Team | 2nd |
| 20.5.1973 | Interserie Silverstone | 6 | #017 | Georg Loos | Gelo Racing Team | 3rd |
| 20.5.1973 | Interserie Silverstone | 16 | | Charlie Kemp | Rinzler Motoracing Inc. | DNA |
| 10.6.1973 | Can-Am Mosport | 0 | #018 | Jody Scheckter | Vasek Polak Racing, Inc. | DNF |
| 10.6.1973 | Can-Am Mosport | 4 | #006 | Hans Wiedmer | Hans Wiedmer | 2nd |
| 10.6.1973 | Can-Am Mosport | 16 | #003 | George Follmer | Rinzler Motoracing/Royal Crown | DNF |
| 10.6.1973 | Can-Am Mosport | 23 | #005 | Charlie Kemp | Rinzler Motoracing/Royal Crown | 1st |
| 10.6.1973 | Can-Am Mosport | 59 | #007 | Hurley Haywood | Brumos Racing | DNF |
| 24.6.1973 | Interserie Norisring | 1 | #004 | Leo Kinnunen | Motorsport-Club Stuttgart/Racing Team AAW | 1st |
| 24.6.1973 | Interserie Norisring | 2 | #015 | Willi Kauhsen | Willi Kauhsen Racing Team | 4th |
| 24.6.1973 | Interserie Norisring | 6 | #017 | Georg Loos | Gelo-Racing-Team | 2nd |
| 1.7.1973 | Mainz-Finthen [S+1.6] | 1 | #004 | Leo Kinnunen | Leo Kinnunen | 1st |
| 8.7.1973 | Can-Am Road Atlanta | 0 | #018 | Jody Scheckter | Vasek Polak Racing, Inc. | 3rd |
| 8.7.1973 | Can-Am Road Atlanta | 4 | #006 | Hans Wiedmer | Hans Wiedmer | DNF |
| 8.7.1973 | Can-Am Road Atlanta | 16 | #005 | George Follmer | Rinzler Motoracing/Royal Crown | 1st |
| 8.7.1973 | Can-Am Road Atlanta | 23 | #003 | Charlie Kemp | Rinzler Motoracing/Royal Crown | DNA |
| 8.7.1973 | Can-Am Road Atlanta | 59 | #007 | Hurley Haywood | Brumos Racing | 5th |
| 15.7.1973 | Interserie Hockenheim | 1 | #004 | Leo Kinnunen | Motorsport-Club Stuttgart e. V. Racing Team AAW | 9th |
| 15.7.1973 | Interserie Hockenheim | 2 | #015 | Willi Kauhsen | Willi Kauhsen Racing Team | 6th |
| 15.7.1973 | Interserie Hockenheim | 6 | #017 | Georg Loos | Gelo Racing Team | 2nd |
| 22.7.1973 | Can-Am Watkins Glen | 0 | #018 | Jody Scheckter | Vasek Polak Racing, Inc. | 3rd |
| 22.7.1973 | Can-Am Watkins Glen | 4 | #006 | Hans Wiedmer | Hans Wiedmer | DNF |
| 22.7.1973 | Can-Am Watkins Glen | 16 | #003 | George Follmer | Rinzler Motoracing-Royal Crown | DNF |
| 22.7.1973 | Can-Am Watkins Glen | 23 | #005 | Charlie Kemp | Rinzler Motoracing-Royal Crown Cola | 4th |
| 22.7.1973 | Can-Am Watkins Glen | 59 | #007 | Hurley Haywood | Brumos Porsche-Audi Corp. | DNF |
| 12.8.1973 | Can-Am Mid-Ohio | 0 | #018 | Jody Scheckter | Vasek Polak | DNF |
| 12.8.1973 | Can-Am Mid-Ohio | 4 | #006 | Hans Wiedmer | Vasek Polak | DNF |
| 12.8.1973 | Can-Am Mid-Ohio | 5 | #015 | Willi Kauhsen | Willi Kauhsen Racing | DNF |
| 12.8.1973 | Can-Am Mid-Ohio | 16 | #003 | George Follmer | Rinzler Motoracing/R-C Cola | 2nd |
| 12.8.1973 | Can-Am Mid-Ohio | 23 | #005 | Charlie Kemp | Rinzler Motoracing/R-C Cola | DNS |
| 12.8.1973 | Can-Am Mid-Ohio | 59 | #007 | Hurley Haywood | Brumos Porsche/Go Navy | 3rd |
| 19.8.1973 | Interserie Misano | 1 | #004 | Leo Kinnunen | Motorsport-Club Stuttgart/Racing Team AAW | 1st |
| 19.8.1973 | Interserie Misano | 2 | #001 | Willi Kauhsen | Willi Kauhsen Racing Team | 4th |
| 19.8.1973 | Interserie Misano | 6? | #017 | Georg Loos | Gelo Racing Team | DNF |
| 26.8.1973 | Can-Am Road America | 0 | #018 | Jody Scheckter | Vasek Polak Racing, Inc. | 2nd |
| 26.8.1973 | Can-Am Road America | 4 | #006 | Hans Wiedmer | Hans Wiedmer | DNA |
| 26.8.1973 | Can-Am Road America | 5 | #015 | Willi Kauhsen | Willi Kauhsen Racing Team | DNA |
| 26.8.1973 | Can-Am Road America | 16 | #003 | George Follmer | Rinzler Motoracing Royal Crown | 3rd |
| 26.8.1973 | Can-Am Road America | 23 | #005 | Charlie Kemp | Rinzler Motoracing Royal Crown | DNF |
| 26.8.1973 | Can-Am Road America | 59 | #007 | Hurley Haywood | Brumos Porsche Audi | DNF |
| 16.9.1973 | Can-Am Edmonton | 0 | #018 | Jody Scheckter | Vasek Polak Porsche Audi | DNF |
| 16.9.1973 | Can-Am Edmonton | 16 | #003 | George Follmer | Royal Crown Cola | 2nd |
| 16.9.1973 | Can-Am Edmonton | 23 | #005 | Charlie Kemp | Royal Crown Cola | 8th |
| 16.9.1973 | Can-Am Edmonton | 59 | #007 | Hurley Haywood | Brumos Racing | DNS |
| 30.9.1973 | Interserie Hockenheim | 1 | #004 | Leo Kinnunen | MSC Stuttgart | 1st |
| 30.9.1973 | Interserie Hockenheim | 2 | #001 | Willi Kauhsen | Willi Kauhsen-Racing Team | 4th |
| 30.9.1973 | Interserie Hockenheim | 6 | #017 | Georg Loos | Gelo-Racing Team | 2nd |
| 30.9.1973 | Interserie Hockenheim | 11 | #015 | Wilson Fittipaldi | Willi Kauhsen-Racing Team | ?th |
| 14.10.1973 | Can-Am Laguna Seca | 0 | #018 | Jody Scheckter | Vasek Polak Racing | DNF |
| 14.10.1973 | Can-Am Laguna Seca | 59 | #007 | Hurley Haywood | Brumos Racing | 3rd |