| 10.1.1999 | Daytona Test | 0 | Boxster 986 | Epps / Stanton / Slater / Hessert | Turning Point Racing | 48th |
| 10.1.1999 | Daytona Test | 01 | 993 Carrera RSR | Greenberg / Drew / Nelson / Peter | Greycliff Racing | 45th |
| 10.1.1999 | Daytona Test | 02 | 993 Carrera RSR | Reiser / Mowlem / Willingham / Murry | Reiser/Callas Rennsport | 41st |
| 10.1.1999 | Daytona Test | 04 | 993 Carrera RSR | Schmidt / Conkel / Schmidt | Schmidt Motorsports | 50th |
| 10.1.1999 | Daytona Test | 07 | 911 | Marshall / Marshall / Law / Huisman / Tremblay | G & W Motorsports | 31st |
| 10.1.1999 | Daytona Test | 08 | 993 GT2 | Konig / Ulrich / Chambers / Wilson | G & W Motorsports | 27th |
| 10.1.1999 | Daytona Test | 9 | 993 Carrera RSR | Kitchak / Heger | Toad Hall Motor Racing | 39th |
| 10.1.1999 | Daytona Test | 15 | 911 | Marcus Gustafson | Johnson Autosport | 61st |
| 10.1.1999 | Daytona Test | 18 | 911 Carrera RSR | Friedman / Auberlen / Miller | Millenium Motorsports | 42nd |
| 10.1.1999 | Daytona Test | 21 | 993 GT2 R | Rosa / Rosa / Mangifesta / Zonca | Haberthur Racing | 49th |
| 10.1.1999 | Daytona Test | 22 | 993 Carrera RSR | Kitch / Wolfkill / Hill / Gaughran | Alex Job Racing | 40th |
| 10.1.1999 | Daytona Test | 23 | 993 Carrera RSR | Havens / Wagner / Collins / Lazzaro | Alex Job Racing | 32nd |
| 10.1.1999 | Daytona Test | 31 | 993 GT2 R | Casadei / Garbagnati / Bucci / Ciani | Haberthur Racing | 30th |
| 10.1.1999 | Daytona Test | 39 | 993 Carrera RSR | Kicak / Pumpelly / Mitchum / Kimbrough | Pumpelly/Mitchum Motorsports | 54th |
| 10.1.1999 | Daytona Test | 41 | 911 Carrera RSR | McGlynn / Balbach | Johnson Autosport | 58th |
| 10.1.1999 | Daytona Test | 58 | 993 Carrera RSR | Petersen / White / Cilli / Ruther / Miller | Petersen Motorsports | 51st |
| 10.1.1999 | Daytona Test | 65 | 964 Carrera Cup | Buckler / Biskup / Bingham / Jurasz | The Racers Group | 57th |
| 10.1.1999 | Daytona Test | 67 | 993 Carrera RSR | Pelke / Pelke / Takahashi / Herrerias | The Racers Group | 47th |
| 10.1.1999 | Daytona Test | 68 | 993 Carrera RSR | Buckler / Conte / Holt / Lambert | The Racers Group | 36th |
| 10.1.1999 | Daytona Test | 69 | 993 Carrera RSR | Perrier / Ricci / Richard | Perspective Racing | DNA |
| 10.1.1999 | Daytona Test | 73 | 993 Carrera RSR | Lewis / Wheeler | Jack Lewis Enterprises | 56th |
| 10.1.1999 | Daytona Test | 76 | 993 Carrera RSR | Argetsinger / Polidori / Hill / McCaig | Team A.R.E. | 43rd |
| 10.1.1999 | Daytona Test | 77 | 993 GT2 | Nearn / Muenz / Burgess / Bagnall | Seikel Motorsport | 24th |
| 10.1.1999 | Daytona Test | 82 | 993 GT2 | Ortelli / Hürtgen | Roock Racing | 16th |
| 10.1.1999 | Daytona Test | 86 | 993 Carrera RSR | Marshall / Marshall | G & W Motorsports | 53rd |
| 10.1.1999 | Daytona Test | 89 | 944 Turbo | Lenain / Gregg / Wright / Borkowski / Crilly / Montgomery | Broadfoot Racing | 64th |
| 10.1.1999 | Daytona Test | 97 | 911 Carrera RSR | Tom McGlynn | Johnson Autosport Racing | 35th |
| 10.1.1999 | Daytona Test | 98 | 968 Turbo RS | Coker / White | Hendrick Porsche | 46th |
| 10.1.1999 | Daytona Test | 99 | 993 GT2 | Schumacher / O'Steen / Müller / Snow | Schumacher Racing | 20th |
| 31.1.1999 | 24 h Daytona | 0 | Boxster 986 | Marvin Epps | Turning Point Racing | DNA |
| 31.1.1999 | 24 h Daytona | 01 | 993 Carrera RSR | Nelson | Greycliff Racing | 77th |
| 31.1.1999 | 24 h Daytona | 02 | 993 Carrera RSR | Murry / Mowlem / Reiser / Willingham | Reiser/Callas Rennsport | 9th |
| 31.1.1999 | 24 h Daytona | 04 | 993 Carrera RSR | Schmidt / Conkel / Schmidt | Schmidt Motorsports | 48th |
| 31.1.1999 | 24 h Daytona | 07 | 993 GT2 Evo | Law / Marshall / Huisman / Tremblay / Marshall | G&W Motorsports | 11th |
| 31.1.1999 | 24 h Daytona | 08 | 993 GT2 R | Wilson / Konig / Ulrich / Pickup | G&W Motorsports | 70th |
| 31.1.1999 | 24 h Daytona | 9 | 993 Carrera RSR | Peter Kitchak | Toad Hall Motor Racing | DNA |
| 31.1.1999 | 24 h Daytona | 15 | 911 | Marcus Gustafson | Johnson Autosport | DNA |
| 31.1.1999 | 24 h Daytona | 18 | 911 Carrera RSR | Friedman / Miller / Rice / Auberlen / Peter | Millennium Motorsports | 12th |
| 31.1.1999 | 24 h Daytona | 21 | 993 GT2 R | Rosa / Mangifesta / Zonca / Rosa | Haberthur Racing | 68th |
| 31.1.1999 | 24 h Daytona | 22 | 993 Carrera RSR | Kitch / Wolfkill / Hill / Gaughran | Alex Job Racing | 51st |
| 31.1.1999 | 24 h Daytona | 23 | 993 Carrera RSR | Collins / Wagner / Lazzaro / Havens | Alex Job Racing | 6th |
| 31.1.1999 | 24 h Daytona | 25 | 993 Carrera RSR | Hofer | RWS-Brun Motorsport | 73rd |
| 31.1.1999 | 24 h Daytona | 31 | 993 GT2 R | Casadei | Haberthur Racing | 75th |
| 31.1.1999 | 24 h Daytona | 33 | 993 GT2 | Heger / Kitchak / Slater / Konrad | Konrad Motorsport | 40th |
| 31.1.1999 | 24 h Daytona | 39 | 993 Carrera RSR | Pumpelly / Mitchum / Kicak / Lester / Dro | Pumpelly/Mitchum Motorsports | 27th |
| 31.1.1999 | 24 h Daytona | 48 | 993 GT2 | Kaufmann / Ligonnet / Stewart | Freisinger Motorsport | 44th |
| 31.1.1999 | 24 h Daytona | 49 | 993 GT2 | Irmgratz / Jurasz / van de Vyver / Horn | Freisinger Motorsport | 20th |
| 31.1.1999 | 24 h Daytona | 55 | 993 GT2 | Seiler / Ried / Vuillaume / Ruch | Proton Competition | 34th |
| 31.1.1999 | 24 h Daytona | 56 | 993 Carrera RSR | Willems / Manthey / Gindorf / Gallade / Richter | Manthey Racing | 45th |
| 31.1.1999 | 24 h Daytona | 58 | 993 Carrera RSR | Cilli | Petersen Racing | 72nd |
| 31.1.1999 | 24 h Daytona | 66 | 993 Cup | Morini / Scarpetta / Cattaneo / Tamburini / De Castro | M.A.C. Racing | 16th |
| 31.1.1999 | 24 h Daytona | 67 | 993 Carrera RSR | Pelke / Pelke / Herrerias / DiGiovanni | The Racers Group | 54th |
| 31.1.1999 | 24 h Daytona | 68 | 993 Carrera RSR | Buckler / Conte / Holt / Lambert | The Racers Group | 14th |
| 31.1.1999 | 24 h Daytona | 69 | 993 Carrera RSR | Wollek | Perspective Racing | 76th |
| 31.1.1999 | 24 h Daytona | 73 | 993 Carrera RSR | Wheeler / Lewis / Manfredi / Takahashi / Henriksen | Jack Lewis Enterprises/Autosport South | 29th |
| 31.1.1999 | 24 h Daytona | 76 | 993 Carrera RSR | Argetsinger / Polidori / Hill / McCaig | Team A.R.E. | 52nd |
| 31.1.1999 | 24 h Daytona | 77 | 993 GT2 | Bagnall / Mastropietro / Burgess / Neugarten | Seikel Motorsport | 19th |
| 31.1.1999 | 24 h Daytona | 82 | 993 GT2 | Ortelli / Bertaggia / Hürtgen / Nearn | Roock Racing | 25th |
| 31.1.1999 | 24 h Daytona | 83 | 993 GT2 | Ahrlé / Sangiuolo / Warnock / Haupt | Roock Racing | 7th |
| 31.1.1999 | 24 h Daytona | 85 | 993 | Cilli / Miller / Petersen / Ruther / White | Petersen Racing | unused |
| 31.1.1999 | 24 h Daytona | 86 | 993 Carrera RSR | Marshall / Marshall | G&W Motorsports | DNA |
| 31.1.1999 | 24 h Daytona | 89 | 944 Turbo | Crilly / Wright / Lenain / Borkowski / Bove | Broadfoot Racing | 37th |
| 31.1.1999 | 24 h Daytona | 92 | 993 Carrera RSR | Mowlem | Reiser/Callas Rennsport | 74th |
| 31.1.1999 | 24 h Daytona | 97 | 911 Carrera RSR | Tom McGlynn | Johnson Autosport Racing | DNA |
| 31.1.1999 | 24 h Daytona | 98 | 968 Turbo RS | Coker / White | Hendrick Porsche | DNA |
| 31.1.1999 | 24 h Daytona | 99 | 993 GT2 | Snow / Müller / O'Steen / Schumacher | Schumacher Racing | 10th |
| 20.3.1999 | 12 h Sebring | 04 | 993 GT2 R | Morton / Graham / Jones | CJ Motorsport | 28th |
| 20.3.1999 | 300 km Suzuka | 9 | 993 Carrera RSR 3.8 | Hane / Tokuda | Team Daikokuya | DNF |
| 20.3.1999 | 300 km Suzuka | 10 | 993 GT2 | Asou / Hinoi | Ability Motorsports | DNQ |
| 20.3.1999 | 12 h Sebring | 17 | 993 Carrera RSR | Conte / Lambert | Aasco Performance | 14th |
| 20.3.1999 | 12 h Sebring | 22 | 993 Carrera RSR | Pobst / Fitzgerald / MacNeil | Alex Job Racing | 13th |
| 20.3.1999 | 12 h Sebring | 23 | 993 Carrera RSR | Collins / Wagner / Havens | Alex Job Racing | 11th |
| 20.3.1999 | 12 h Sebring | 25 | 993 Carrera RSR | Hofer / Riccitelli / Blieninger / Jodexnis | RWS Motorsport | DNS |
| 20.3.1999 | 300 km Suzuka | 26 | 911 Carrera RSR | Suga / Sunako | Team Tasian Jr. | 20th |
| 20.3.1999 | 12 h Sebring | 38 | 911 GT1 Evo | Boutsen / Wollek / Müller | Champion Racing | 4th |
| 20.3.1999 | 12 h Sebring | 39 | 993 Carrera RSR | Earle / Snyder / Ziegelman / Mitchum | Broadfoot Racing | 47th |
| 20.3.1999 | 12 h Sebring | 48 | 993 GT2 | Kaufmann / Ligonnet / Stewart | Freisinger Motorsport | 10th |
| 20.3.1999 | 12 h Sebring | 49 | 993 GT2 | Irmgratz / Jurasz / Creger | Freisinger Motorsport | 27th |
| 20.3.1999 | 12 h Sebring | 50 | 911 Carrera RSR | Johnson / Hoke / McGlynn | Johnson Autosport | 52nd |
| 20.3.1999 | 12 h Sebring | 56 | 993 GT2 R | Snow / Snow / Huisman | Martin Snow Racing | 9th |
| 20.3.1999 | 12 h Sebring | 61 | 993 GT2 | Slater / Kitchak / Hezemans | Konrad Motorsport | 16th |
| 20.3.1999 | 300 km Suzuka | 70 | 993 GT2 | Ishibashi / van Schoote | Team Gaikokuya | 22nd |
| 20.3.1999 | 12 h Sebring | 71 | 993 GT2 Evo | Pilla / Mazzuoccola | DM Motorsports | 57th |
| 20.3.1999 | 300 km Suzuka | 71 | 993 GT2 | Jounai / Kawano | Sigmatec Racing Team | DQ |
| 20.3.1999 | 12 h Sebring | 83 | 993 GT2 | Hürtgen / Haupt / Brown | ARBJH Development | 39th |
| 20.3.1999 | 300 km Suzuka | 99 | 993 Carrera RSR 3.8 | Yoshitomi / Hioki | Team Daikokuya | 27th |
| 20.3.1999 | 12 h Sebring | 99 | 993 GT2 | Nearn / Schumacher | Schumacher Racing | 53rd |
| 20.3.1999 | 300 km Suzuka | 910 | 993 Carrera RSR 3.8 | Yogou / Tamamoto | 910 Racing | 15th |