1998 Lime Rock Grand Prix
The 1998 Lime Rock Grand Prix was the third round of the 1998 IMSA GT Championship season and was held over two separate rounds, a WSC class race and a GT class race. The two separate races took place on May 25, 1998.
WSC Results
Class winners in bold.GT Results
Class winners in bold.| Pos | Class | No | Team | Drivers | Chassis | Tyre | Laps |
| Pos | Class | No | Team | Drivers | Engine | Tyre | Laps |
| 1 | GT1 | 4 | Panoz Motorsports |  Andy Wallace David Brabham | Panoz Esperante GTR-1 | 112 | |
| 1 | GT1 | 4 | Panoz Motorsports | Andy Wallace David Brabham | Ford 6.0L V8 | 112 | |
| 2 | GT1 | 5 | Panoz Motorsports |  Éric Bernard Raul Boesel | Panoz Esperante GTR-1 | 110 | |
| 2 | GT1 | 5 | Panoz Motorsports | Éric Bernard Raul Boesel | Ford 6.0L V8 | 110 | |
| 3 DNF | GT1 | 2 | Mosler Automotive |  Shane Lewis Vic Rice | Mosler Raptor | ? | 107 |
| 3 DNF | GT1 | 2 | Mosler Automotive | Shane Lewis Vic Rice | Chevrolet 6.3L V8 | ? | 107 |
| 4 | GT2 | 6 | Prototype Technology Group |  Marc Duez Boris Said | BMW M3 | 105 | |
| 4 | GT2 | 6 | Prototype Technology Group | Marc Duez Boris Said | BMW 3.2L I6 | 105 | |
| 5 | GT3 | 1 | Prototype Technology Group |  Ross Bentley Peter Cunningham | BMW M3 | 105 | |
| 5 | GT3 | 1 | Prototype Technology Group | Ross Bentley Peter Cunningham | BMW 3.2L I6 | 105 | |
| 6 | GT2 | 99 | Schumacher Racing | Larry Schumacher Joe Varde | Porsche 911 GT2 | 104 | |
| 6 | GT2 | 99 | Schumacher Racing | Larry Schumacher Joe Varde | Porsche 3.6L Turbo Flat-6 | 104 | |
| 7 | GT3 | 10 | Prototype Technology Group | Bill Auberlen Mark Simo | BMW M3 | 104 | |
| 7 | GT3 | 10 | Prototype Technology Group | Bill Auberlen Mark Simo | BMW 3.2L I6 | 104 | |
| 8 | GT3 | 23 | Alex Job Racing | Cort Wagner Darryl Havens | Porsche 911 Carrera RSR | 103 | |
| 8 | GT3 | 23 | Alex Job Racing | Cort Wagner Darryl Havens | Porsche 3.8L Flat-6 | 103 | |
| 9 | GT3 | 71 | Gordon Zimmerman | Steve Pfeffer Gordon Zimmerman | Porsche 911 Carrera RSR | ? | 102 |
| 9 | GT3 | 71 | Gordon Zimmerman | Steve Pfeffer Gordon Zimmerman | Porsche 3.8L Flat-6 | ? | 102 |
| 10 | GT3 | 24 | Tim Vargo | Jake Vargo Brady Refenning | Porsche 911 Carrera RSR | 100 | |
| 10 | GT3 | 24 | Tim Vargo | Jake Vargo Brady Refenning | Porsche 3.8L Flat-6 | 100 | |
| 11 | GT2 | 00 | David Friedman | Todd Snyder David Friedman | Porsche 993 Carrera RSR | ? | 99 |
| 11 | GT2 | 00 | David Friedman | Todd Snyder David Friedman | Porsche 3.8L Flat-6 | ? | 99 |
| 12 | GT3 | 98 | Chris Mitchum | Spencer Pumpelly Matt Plumb | Porsche 911 Carrera RSR | ? | 99 |
| 12 | GT3 | 98 | Chris Mitchum | Spencer Pumpelly Matt Plumb | Porsche 3.8L Flat-6 | ? | 99 |
| 13 | GT3 | 81 | Raymond Boissoneau |  Rino Mastronardi Raymond Boissoneau Nicolas Rondet | Mazda RX-7 | ? | 97 |
| 13 | GT3 | 81 | Raymond Boissoneau | Rino Mastronardi Raymond Boissoneau Nicolas Rondet | Mazda 2.0L 3-Rotor | ? | 97 |
| 14 DNF | GT3 | 22 | Reisman Property Interests, Inc. | John Reisman Paul Reisman | Chevrolet Camaro | ? | 38 |
| 14 DNF | GT3 | 22 | Reisman Property Interests, Inc. | John Reisman Paul Reisman | Chevrolet 5.7L V8 | ? | 38 |
| DNS | GT1 | 12 | Bruce Barkelew | Brian Simo | Ford Mustang | ? | - |
| DNS | GT1 | 12 | Bruce Barkelew | Brian Simo | Ford 4.6L V8 | ? | - |