The 1998 International Sports Racing Series was the second season of International Sportscar Racing Series (later known as the FIA Sportscar Championship). It was a series for sportscar-style prototypes broken into two classes based on power and weight, called SR1 and SR2, as well as a class of hillclimb-style sportscars, called CN. It began on April 13, 1998, and ended December 6, 1998, after 8 races.
| Rnd | Race | Circuit | Date | |
|---|---|---|---|---|
| 1 |  Paul Ricard 2 Hours 30 Minutes | Circuit Paul Ricard | April 13 | |
| 2 |  Brno 2 Hours 30 Minutes | Autodrom Brno Masaryk | May 17 | |
| 3 |  Giesse ISRS Trophy (2 Hours 30 Minutes) | Misano Circuit | July 4 | |
| 4 |  RAC Tourist Trophy (2 Hours 30 Minutes) | Donington Park | July 19 | |
| 5 |  Anderstorp 2 Hours 30 Minutes | Scandinavian Raceway | August 16 | |
| 6 |  DMC/ADAC Sportwagen Festival (2 Hours 30 Minutes) | Nürburgring | September 6 | |
| 7 | Le Mans Autumn Cup (2 Hours 30 Minutes) | Bugatti Circuit | September 19 | |
| 8 |  Vodacom ISRS (2 Hours 30 Minutes) | Kyalami | December 6 |
| Rnd | Circuit | SR1 Winning Team | SR2 Winning Team | CN Winning Team | Results |
|---|---|---|---|---|---|
| SR1 Winning Drivers | SR2 Winning Drivers | CN Winning Drivers | |||
| 1 | Paul Ricard |  #27 Horag-Lista Racing | #32 Waterair Sports | #41 Centenari Racing SRL | Results |
Fredy Lienhard Didier Theys | André Cholley Edouard Sezionale Lionel Robert | Arturo Merzario Fulvio Ballabio Robin Donovan | |||
| 2 | Brno | #5 JB Giesse Team Ferrari | None | #45 Tampolli Engineering | Results |
| Emmanuel Collard Vincenzo Sospiri | Fabio Mancini Luca Riccitelli | ||||
| 3 | Misano | #5 JB Giesse Team Ferrari | #32 Waterair Sports | #44 Tampolli Engineering | Results |
| Emmanuel Collard Vincenzo Sospiri | André Cholley Edouard Sezionale Jean-Claude de Castelli | Felice Tedeschi Gianluca Giraudi | |||
| 4 | Donington | #5 JB Giesse Team Ferrari | #32 Waterair Sports | #45 Tampolli Engineering | Results |
| Emmanuel Collard Vincenzo Sospiri | François Jakubowski Jean-Claude de Castelli | Fabio Mancini Luca Riccitelli | |||
| 5 | Anderstorp | #5 JB Giesse Team Ferrari | None | #45 Tampolli Engineering | Results |
| Emmanuel Collard Vincenzo Sospiri | Fabio Mancini Luca Riccitelli | ||||
| 6 | Nürburgring | #5 JB Giesse Team Ferrari | #32 Waterair Sports | #44 Tampolli Engineering | Results |
| Emmanuel Collard Vincenzo Sospiri | Jean-Claude de Castelli François Jakubowski | Felice Tedeschi Gianluca Giraudi | |||
| 7 | Le Mans | #5 JB Giesse Team Ferrari | #33 Waterair Sports | #45 Tampolli Engineering | Results |
| Emmanuel Collard Vincenzo Sospiri | André Cholley Pierre Bruneau | Fabio Mancini Luca Riccitelli | |||
| 8 | Kyalami | #19 Solution F | #33 Waterair Sports | #45 Tampolli Engineering | Results |
| Jérôme Policand Gary Formato | Philippe Favre Didier Bonnet | Fabio Mancini Luca Riccitelli Denny Zardo |
Points are awarded to the top 10 finishers in the order of 20-15-12-10-8-6-4-3-2-1. Only the highest placing car within a team earned points towards the championship. The SportsRacing World Cup was available to all teams that participated, but separate SR2 and CN championships were also held.
| Pos | Team | Car | Engine | Rd 1 | Rd 2 | Rd 3 | Rd 4 | Rd 5 | Rd 6 | Rd 7 | Rd 8 | Total | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | JB Giesse Team Ferrari | Ferrari 333 SP | Ferrari F310E 4.0L V12 | 20 | 20 | 20 | 20 | 20 | 20 | 120 | |||
| 2 | Horag-Lista Team | Ferrari 333 SP | Ferrari F310E 4.0L V12 | 20 | 8 | 12 | 15 | 15 | 15 | 85 | |||
| 3 | Solution F | Riley & Scott Mk III | Ford 5.0L V8 | 10 | 15 | 10 | 20 | 55 | |||||
| 4 | Autosport Racing | Ferrari 333 SP | Ferrari F310E 4.0L V12 | 8 | 3 | 10 | 12 | 8 | 4 | 45 | |||
| 5 | BMW Team Rafanelli | Riley & Scott Mk III | BMW 4.0L V8 | 15 | 12 | 15 | 42 | ||||||
| 6= | Target 24 | Riley & Scott Mk III | Chevrolet 5.0L V8 | 12 | 6 | 8 | 12 | 38 | |||||
| 6= | Tampolli Engineering | Tampolli RTA-98 | Alfa Romeo 3.0L V6 | 4 | 8 | 10 | 4 | 6 | 2 | 4 | 38 | ||
| 8 | Repsol Kremer Racing | Kremer K8 Spyder | Porsche 3.0L Turbo Flat-6 | 15 | 2 | 1 | 2 | 3 | 6 | 29 | |||
| 9 |  GLV Brums | Ferrari 333 SP | Ferrari F310E 4.0L V12 | 10 | 8 | 8 | 26 | ||||||
| 10 | Siliprandi Racing | Lucchini P1-98 | Alfa Romeo 3.0L V8 | 6 | 4 | 3 | 3 | 16 | |||||
| 11 |  Dyson Racing | Riley & Scott Mk III | Ford 5.0L V8 | 15 | 15 | ||||||||
| 12 | Centenari Racing SRL | Centenari M1 | Alfa Romeo 3.0L V6 | 10 | 2 | 1 | 13 | ||||||
| 13= | GTC Motorsport Lanzante | Ferrari 333 SP | Ferrari F310E 4.0L V12 | 12 | 12 | ||||||||
| 13= | Waterair Sports | Debora LMP296 Debora LMP297 | Cosworth 2.0L I4 BMW 3.0L I6 | 8 | 4 | 12 | |||||||
| 13= | Doyle-Risi Racing | Ferrari 333 SP | Ferrari F310E 4.0L V12 | 12 | 12 | ||||||||
| 16 | Equipe Promotion Racing | Courage C41 | Porsche 3.0L Turbo Flat-6 | 1 | 10 | 11 | |||||||
| 17 | Agusta Kremer Racing | Kremer K8 Spyder | Porsche 3.0L Turbo Flat-6 | 2 | 3 | 2 | 3 | 10 | |||||
| 18 | SCI | Spice SCI | Ford Cosworth 3.5L V8 | 6 | 2 | 8 | |||||||
| 19= | La Filière | Courage C36 | Porsche 3.0L Turbo Flat-6 | 6 | 6 | ||||||||
| 19= | McNeil Engineering | Lola 981 | Judd GV10 3.4L V10 Judd GV4 4.0L V10 | 6 | 6 | ||||||||
| 21 | Cipriani Motorsport | Lucchini P3-96 | Alfa Romeo 3.0L V6 | 3 | 3 | ||||||||
| 22 | G4 Team Gebhardt | Gebhardt G4 | Audi 2.1L Turbo I5 | 2 | 2 |
| Pos | Team | Car | Engine | Rd 1 | Rd 2 | Rd 3 | Rd 4 | Rd 5 | Rd 6 | Rd 7 | Rd 8 | Total | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Waterair Sports | Debora LMP296 Debora LMP297 | Cosworth 2.0L I4 BMW 3.0L I6 | 20 | 20 | 20 | 20 | 20 | 100 | ||||
| 2 | Mark Bailey Racing | MBR 972 | Ford 3.0L V6 MG 3.0L V6 | 15 | 12 | 27 |
| Pos | Team | Car | Engine | Rd 1 | Rd 2 | Rd 3 | Rd 4 | Rd 5 | Rd 6 | Rd 7 | Rd 8 | Total | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Tampolli Engineering | Tampolli RTA-98 | Alfa Romeo 3.0L V6 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 140 | ||
| 2= | Siliprandi Racing | Lucchini LMP1-98 | Alfa Romeo 3.0L V6 | 10 | 15 | 15 | 15 | 15 | 10 | 80 | |||
| 2= | Centenari Racing SRL | Centenari M1 | Alfa Romeo 3.0L V6 | 20 | 15 | 8 | 12 | 10 | 15 | 80 | |||
| 4 | Cipriani Motorsport | Lucchini P3-96 | Alfa Romeo 3.0L V6 | 10 | 12 | 22 | |||||||
| 5 | Luigi Taverna | Osella PA20 | BMW 3.0L I6 | 6 | 12 | 18 | |||||||
| 6 | Osella SRL | Osella PA20 | BMW 3.0L I6 | 8 | 8 |