| 17.5.1998 | 2 h 15 min Homestead | 07 | 993 GT2 Evo | Marshall / Marshall | G & W Motorsports | 16th |
| 17.5.1998 | 2 h 15 min Homestead | 17 | 911 Carrera RSR | Dennis Aase | AASCO Performance | DNA |
| 17.5.1998 | 2 h 15 min Homestead | 25 | 911 Carrera RSR | Don Kitch | Alex Job Racing | DNA |
| 17.5.1998 | 2 h 15 min Homestead | 41 | 993 Carrera RSR | Busby / Cervelli | Technodyne | DNA |
| 17.5.1998 | 2 h 15 min Homestead | 52 | 911 Carrera RSR | Stitt / Russell | Team Protosport GT | 18th |
| 17.5.1998 | 2 h 15 min Homestead | 69 | 993 Carrera Turbo | Spreng | Spreng Enterprises | 25th |
| 17.5.1998 | 2 h 15 min Homestead | 69 | 993 GT2 | Lay / Langhorne | Proton Competition | DNA |
| 17.5.1998 | 2 h 15 min Homestead | 73 | 993 Carrera RSR | Jack Lewis | Jack Lewis Enterprises | DNA |
| 17.5.1998 | 2 h 15 min Homestead | 76 | 993 Carrera RSR | Doolin / Peeler | Team A.R.E. | DNA |
| 17.5.1998 | 2 h 15 min Homestead | 86 | 993 Carrera RSR | Steve Marshall | G & W Motorsports | DNA |
| 17.5.1998 | 2 h 15 min Homestead | 96 | 993 | Zitza / Wheeler | Olive Garden Racing | DNA |
| 17.5.1998 | 2 h 15 min Homestead | 98 | 993 GT2 | Ham / Konrad | Konrad Motorsport | DNA |
| 17.5.1998 | 2 h 15 min Homestead | 99 | 993 GT2 | Schumacher / O'Steen | Schumacher Racing | DNA |
| 23.5.1998 | 6 h Misano | 6 | 993 GT2 | Mastropietro / Mastropietro / Padovani | Renato Mastroprieto | 2nd |
| 23.5.1998 | 4 h Misano | 6 | 993 GT2 | Mastropietro / Mastropietro / Padovani | Renato Mastroprieto | 3rd |
| 23.5.1998 | 4 h Misano | 11 | 964 Carrera RSR 3.8 | Cassina / Michelotti / Bocciardi | Matteo Cassina | 6th |
| 23.5.1998 | 6 h Misano | 11 | 964 Carrera RSR 3.8 | Cassina / Michelotti / Bocciardi | Matteo Cassina | 4th |
| 23.5.1998 | 6 h Misano | 12 | 964 Carrera RSR 3.8 | Haupt / Gottifredi / Biava | Claudio Haupt | 8th |
| 23.5.1998 | 4 h Misano | 12 | 964 Carrera RSR 3.8 | Haupt / Gottifredi / Biava | Claudio Haupt | 11th |
| 23.5.1998 | 6 h Misano | 14 | 993 Cup | Schmid / Villa / Pasquali | Riccardo Schmid | 5th |
| 23.5.1998 | 4 h Misano | 14 | 993 Cup | Schmid / Villa / Pasquali | Riccardo Schmid | 7th |
| 23.5.1998 | 6 h Misano | 15 | 911 Carrera Cup | Cattaneo / De Castro / Gianotti | Win Sport | 6th |
| 23.5.1998 | 4 h Misano | 15 | 911 Carrera Cup | Cattaneo / De Castro / Gianotti | Win Sport | 9th |
| 23.5.1998 | 4 h Misano | 16 | 911 Carrera RS | Viganó / Rosa / Rosa | Giovanni Vigano | 13th |
| 23.5.1998 | 6 h Misano | 16 | 911 Carrera RS | Viganó / Rosa / Rosa | Giovanni Vigano | 10th |
| 23.5.1998 | 6 h Misano | 19 | 911 Carrera Cup | Costacurta / Bellini | Walter Costacurta | 9th |
| 23.5.1998 | 4 h Misano | 19 | 911 Carrera Cup | Costacurta / Bellini | Walter Costacurta | 12th |
| 23.5.1998 | 6 h Misano | 28 | 993 GT2 R | Smith / Grassi / Ligonnet | Seikel Motorsport | 1st |
| 23.5.1998 | 4 h Misano | 28 | 993 GT2 R | Smith / Grassi / Ligonnet | Seikel Motorsport | 2nd |
| 23.5.1998 | 6 h Misano | 29 | 993 GT2 R | Monteiro / Monteiro | Estoril Racing Team | DNA |
| 23.5.1998 | 4 h Misano | 29 | 993 GT2 R | Monteiro / Monteiro | Estoril Racing Team | DNA |
| 23.5.1998 | 6 h Misano | 32 | 993 GT2 | Pagotto / Giribaldi | Luigino Pagotto | DNF |
| 23.5.1998 | 4 h Misano | 32 | 993 GT2 | Pagotto / Giribaldi | Luigino Pagotto | DNF |
| 23.5.1998 | 6 h Misano | 33 | 993 GT2 | Margueron / Cohen / Kumpen | GLPK Racing | DNF |
| 23.5.1998 | 4 h Misano | 33 | 993 GT2 | Margueron / Cohen / Kumpen | GLPK Racing | 1st |
| 23.5.1998 | 6 h Misano | 35 | 993 GT2 | Ligonnet / Kaufmann | Freisinger Motorsport | DNA |
| 23.5.1998 | 4 h Misano | 35 | 993 GT2 | Ligonnet / Kaufmann | Freisinger Motorsport | DNA |
| 23.5.1998 | 4 h Misano | 37 | 993 GT2 R | Buttiero / Sangiuolo | RWS Brun Motorsport | DNF |
| 23.5.1998 | 6 h Misano | 37 | 993 GT2 R | Buttiero / Sangiuolo | RWS Brun Motorsport | DNF |
| 23.5.1998 | 4 h Misano | 43 | 993 GT2 | Frigerio / Sabatini / Babini | Massimo Frigerio | DNA |
| 23.5.1998 | 6 h Misano | 43 | 993 GT2 | Frigerio / Sabatini / Babini | Massimo Frigerio | DNA |
| 23.5.1998 | 6 h Misano | 46 | 993 GT2 | | Konrad Motorsport | DNA |
| 23.5.1998 | 4 h Misano | 46 | 993 GT2 | | Konrad Motorsport | DNA |
| 23.5.1998 | 6 h Misano | 47 | 993 GT2 | MacQuillan / Erdos | Gerard MacQuillan | DNA |
| 23.5.1998 | 4 h Misano | 47 | 993 GT2 | MacQuillan / Erdos | Gerard MacQuillan | DNA |
| 23.5.1998 | 4 h Misano | 51 | 993 Cup | Blieninger / Riccitelli / Hofer | RWS Brun Motorsport | 5th |
| 23.5.1998 | 6 h Misano | 51 | 993 Cup | Blieninger / Riccitelli / Hofer | RWS Brun Motorsport | 3rd |
| 23.5.1998 | 6 h Misano | 76 | 993 Cup | Perrier / Ricci / Richard | Perspective Automobiles | 11th |
| 23.5.1998 | 4 h Misano | 76 | 993 Cup | Perrier / Ricci / Richard | Perspective Automobiles | 8th |
| 23.5.1998 | 4 h Misano | 77 | 993 Cup | Touroul / Ortion | Raymond Touroul | DNA |
| 23.5.1998 | 6 h Misano | 77 | 993 Cup | Touroul / Ortion | Raymond Touroul | DNA |
| 23.5.1998 | 4 h Misano | 78 | 993 Cup | Albouy / Peyroles | Pilotage Passion | DNA |
| 23.5.1998 | 6 h Misano | 78 | 993 Cup | Albouy / Peyroles | Pilotage Passion | DNA |
| 23.5.1998 | 4 h Misano | 81 | 993 Cup | Helmut Reis | Eco Tec | DNA |
| 23.5.1998 | 6 h Misano | 81 | 993 Cup | Helmut Reis | Eco Tec | DNA |
| 23.5.1998 | 4 h Misano | | 964 Carrera RSR 3.8 | Monforte / Monforte / Monforte | Giuseppe Monforte | DNA |
| 23.5.1998 | 6 h Misano | | 964 Carrera RSR 3.8 | Monforte / Monforte / Monforte | Giuseppe Monforte | DNA |
| 24.5.1998 | British GT Croft | 0 | 911 GT1 | Greasley / Wallinder | Blue Coral/Slick 50/Quaker State | 4th |
| 24.5.1998 | CDN GT Mosport BEMC Spring | 00 | 911 GT1 Evo | Klaus Bytzek | BMS Race Team | 1st |
| 24.5.1998 | CDN GT Mosport BEMC Spring | 07 | 968 | Ludwig Heimrath | Heimrath Porsche Racing | 23rd |
| 24.5.1998 | British GT Croft | 11 | 911 GT1 | Thyrring / Nielsen | Millennium Motorsport | 1st |
| 24.5.1998 | CDN GT Mosport BEMC Spring | 15 | 911 | Blair Killoran | | 21st |
| 24.5.1998 | British GT Croft | 33 | 993 GT2 R | Saunders / Saunders | Gaumont/Parr Motorsport | 12th |
| 24.5.1998 | British GT Croft | 37 | 993 GT2 | Barrett / Lockie | The Premium Team - Carmichaels Motorsport | 14th |
| 24.5.1998 | British GT Croft | 40 | 993 GT2 R | Day / Astley | P K Sport | 9th |
| 24.5.1998 | British GT Croft | 42 | 993 GT2 | Konig / Fisken | P K Sport | 11th |
| 24.5.1998 | British GT Croft | 46 | 964 Carrera RSR 3.8 | Lucas / Osborne | P K Sport | DNA |
| 24.5.1998 | British GT Croft | 50 | 993 GT2 R | Morrison / Lister | Blue Coral/Slick 50/Quaker State | 7th |
| 24.5.1998 | CDN GT Mosport BEMC Spring | 88 | 944 Turbo | Bob Munro | | 11th |
| 24.5.1998 | CDN GT Mosport BEMC Spring | 91 | 993 GT2 Evo | Harry Bytzek | | 3rd |
| 24.5.1998 | CDN GT Mosport BEMC Spring | 96 | 968 | Ray Arbesman | Heimrath Porsche Racing | 29th |
| 24.5.1998 | CDN GT Mosport BEMC Spring | 115 | 911 | John McAulay | | 14th |
| 24.5.1998 | CDN GT Mosport BEMC Spring | 174 | 911 | Ulrich Furtmair | | 15th |
| 25.5.1998 | 1 h 45 min Lime Rock [GT] | 00 | 993 Carrera RSR | Snyder / Friedman | David Friedman | 11th |
| 25.5.1998 | 1 h 45 min Lime Rock [GT] | 23 | 993 Carrera RSR | Wagner / Havens | Alex Job Racing | 8th |
| 25.5.1998 | 1 h 45 min Lime Rock [GT] | 24 | 911 Carrera RSR | Vargo / Refenning | Tim Vargo | 10th |
| 25.5.1998 | 1 h 45 min Lime Rock [GT] | 71 | 911 Carrera RSR | Pfeffer / Zimmerman | Gordon Zimmerman | 9th |
| 25.5.1998 | 1 h 45 min Lime Rock [GT] | 98 | 993 Carrera RSR | Pumpelly / Plumb | Chris Mitchum | 12th |
| 25.5.1998 | 1 h 45 min Lime Rock [GT] | 99 | 993 GT2 | Schumacher / Varde | Schumacher Racing | 6th |
| 31.5.1998 | SM GTR Gelleråsen | 2 | 993 Carrera RSR | Hubert Berg | Hubert Bergh | 1st/DNF |
| 31.5.1998 | SM GTR Gelleråsen | 3 | 993 Cup RS | Lennart Pehrson | Lennart Pehrson | 2nd/1st |
| 31.5.1998 | SM GTR Gelleråsen | 4 | Boxster 986 GTR | Henrik Roos | Jaan Tolli Motorsport JTI | raced/raced |
| 31.5.1998 | SM GTR Gelleråsen | 6 | 964 | Anders Hammer | Porsche Sports Club | raced/raced |
| 31.5.1998 | SM GTR Gelleråsen | 7 | 993 GT2 JPS | Bo Jonasson | Bosse Jonasson | 3rd/raced |
| 31.5.1998 | SM GTR Gelleråsen | 8 | 944 Turbo | Kenneth Olsson | Porsche Sports Club | raced/5th |
| 31.5.1998 | SM GTR Gelleråsen | 9 | 968 Turbo RS | Mark Miller | Jaan Tolli Motorsport JTI | raced/raced |
| 31.5.1998 | SM GTR Gelleråsen | 11 | 944 Turbo | Martin Grosen | Martin Grosen | raced/raced |
| 31.5.1998 | SM GTR Gelleråsen | 12 | 944 Turbo | Stefan Pfister | Stefan Pfister | 4th/2nd |
| 31.5.1998 | SM GTR Gelleråsen | 16 | 964 Carrera RSR | Claés Lund | Klaes Lund | raced/raced |
| 31.5.1998 | SM GTR Gelleråsen | 19 | 968 | Johan Ling-Vannerus | Johan Ling-Vannerus | raced/raced |
| 31.5.1998 | SM GTR Gelleråsen | 46 | 911 Carrera RSR | Peter Gutniak | Peter Gutnaik | 6th/4th |
| 31.5.1998 | SM GTR Gelleråsen | 69 | 911 Cup | Mikael Frisk | Mikael Frisk | raced/raced |
| 31.5.1998 | SM GTR Gelleråsen | 78 | 993 RS | Mikael Baalack | Sundstra Säteri | 5th/3rd |
| 7.6.1998 | 24 h Le Mans | 8 | LMP1/98 | Weaver / Raphanel / Murry | Porsche AG | DNF |
| 7.6.1998 | 24 h Le Mans | 60 | 993 GT2 R | Jarier / Rosenblad / Donovan | Ets Chéreau | DNF |
| 7.6.1998 | 24 h Le Mans | 72 | 993 GT2 R | Goueslard / Yver / Chéreau | Larbre Compétition | DNF |
| 7.6.1998 | Vallelunga | | | Gagliardini | | 3rd |
| 7.6.1998 | Vallelunga | | | Mario Spagnoli | | DNS |
| 7.6.1998 | Vallelunga | | | Angelo Scarpetta | | DNS |
| 7.6.1998 | Vallelunga | | 911 Carrera RS | "Romoletto" | | 1st |