2005 American Le Mans Series
The 2005 American Le Mans Series season was the 35th season for the IMSA GT Championship, with it being the fifth under the American Le Mans Series moniker. It was a series for Le Mans Prototypes and Grand Touring race cars divided into 4 classes: LMP1, LMP2, GT1, and GT2. It began March 19, 2005 and ended October 16, 2005 after 10 races.
Schedule
The schedule change from 2004 to 2005 was minimal, with only one event being added to the existing schedule. The Grand Prix of Atlanta returned once more, once again shortly after the 12 Hours of Sebring.| Rnd | Race | Circuit | Date |
| 1 | Mobil 1 12 Hours of Sebring | Sebring Raceway | March 19 |
| 2 | Sportsbook.com Grand Prix of Atlanta | Road Atlanta | April 17 |
| 3 | American Le Mans at Mid-Ohio | Mid-Ohio | May 22 |
| 4 | New England Grand Prix | Lime Rock Park | July 4 |
| 5 | Infineon Grand Prix of Sonoma | Infineon Raceway | July 17 |
| 6 | Portland Grand Prix | Portland International Raceway | July 30 |
| 7 | Generac 500 at Road America | Road America | August 21 |
| 8 | Grand Prix of Mosport | Mosport | September 4 |
| 9 | Petit Le Mans | Road Atlanta | October 1 |
| 10 | Monterey Sports Car Championships | Mazda Raceway Laguna Seca | October 16 |
Season results
Overall winner in bold.| Rnd | Circuit | LMP1 Winning Team | LMP2 Winning Team | GT1 Winning Team | GT2 Winning Team | Results |
| Rnd | Circuit | LMP1 Winning Drivers | LMP2 Winning Drivers | GT1 Winning Drivers | GT2 Winning Drivers | Results |
| 1 | Sebring |  #1 ADT Champion Racing | #10 Miracle Motorsports |  #57 Aston Martin Racing | #31 Petersen/White Lightning | Results |
| 1 | Sebring |  JJ Lehto Marco Werner Tom Kristensen | Jeff Bucknum Chris McMurry Ian James | Darren Turner David Brabham Stephane Ortelli | Jörg Bergmeister Patrick Long Lucas Luhr | Results |
| 2 | Road Atlanta | #1 ADT Champion Racing | #37 Telesis Intersport Racing | #3 Corvette Racing | #50 Panoz Motorsports | Results |
| 2 | Road Atlanta | JJ Lehto Marco Werner | Jon Field Clint Field |  Ron Fellows Johnny O'Connell | Bill Auberlen Robin Liddell | Results |
| 3 | Mid-Ohio | #16 Dyson Racing | #8 B-K Motorsports† | #3 Corvette Racing | #23 Alex Job Racing | Results |
| 3 | Mid-Ohio | Butch Leitzinger James Weaver | James Bach Guy Cosmo | Ron Fellows Johnny O'Connell | Timo Bernhard Romain Dumas | Results |
| 4 | Lime Rock | #1 ADT Champion Racing | #10 Miracle Motorsports | #4 Corvette Racing | #23 Alex Job Racing | Results |
| 4 | Lime Rock | JJ Lehto Marco Werner | Jeff Bucknum Chris McMurry | Oliver Gavin Olivier Beretta | Timo Bernhard Romain Dumas | Results |
| 5 | Infineon | #2 ADT Champion Racing | #37 Intersport Racing | #3 Corvette Racing | #23 Alex Job Racing | Results |
| 5 | Infineon | Frank Biela Emanuele Pirro | Clint Field Liz Halliday | Ron Fellows Johnny O'Connell | Timo Bernhard Romain Dumas | Results |
| 6 | Portland | #2 ADT Champion Racing | #37 Intersport Racing | #4 Corvette Racing | #23 Alex Job Racing | Results |
| 6 | Portland | Frank Biela Emanuele Pirro | Gregor Fisken Clint Field | Oliver Gavin Olivier Beretta | Timo Bernhard Romain Dumas | Results |
| 7 | Road America | #2 ADT Champion Racing | #10 Miracle Motorsports | #4 Corvette Racing | #31 Petersen/White Lightning | Results |
| 7 | Road America | Frank Biela Emanuele Pirro | Jeff Bucknum Chris McMurry | Oliver Gavin Olivier Beretta | Jörg Bergmeister Patrick Long | Results |
| 8 | Mosport | #16 Dyson Racing | #37 Intersport Racing | #4 Corvette Racing | #31 Petersen/White Lightning | Results |
| 8 | Mosport | Butch Leitzinger James Weaver | Clint Field Liz Halliday | Oliver Gavin Olivier Beretta | Jörg Bergmeister Patrick Long | Results |
| 9 | Road Atlanta | #2 ADT Champion Racing | #37 Intersport Racing | #4 Corvette Racing | #31 Petersen/White Lightning | Results |
| 9 | Road Atlanta | Frank Biela Emanuele Pirro | Jon Field Clint Field Liz Halliday | Oliver Gavin Olivier Beretta Jan Magnussen | Jörg Bergmeister Patrick Long | Results |
| 10 | Laguna Seca | #15 Zytek Engineering | #6 Penske Racing | #4 Corvette Racing | #31 Petersen/White Lightning | Results |
| 10 | Laguna Seca | Tom Chilton Hayanari Shimoda | Lucas Luhr Sascha Maassen | Oliver Gavin Olivier Beretta | Jörg Bergmeister Patrick Long | Results |
† - The #8 B-K Motorsports entry failed to finish but completed enough laps to score points.
Teams Championship
Points are awarded to the top 10 finishers in the following order:- 20-16-13-10-8-6-4-3-2-1
- 23-19-16-13-11-9-7-6-5-4
- 26-22-19-16-14-12-10-9-8-7
LMP1 Standings
| Pos | Team | Chassis | Engine | Rd 1 | Rd 2 | Rd 3 | Rd 4 | Rd 5 | Rd 6 | Rd 7 | Rd 8 | Rd 9 | Rd 10 | Total |
| 1 | ADT Champion Racing | Audi R8 | Audi 3.6L Turbo V8 | 26 | 20 | 13 | 20 | 20 | 20 | 20 | 16 | 26 | 19 | 200 |
| 2 | Dyson Racing | MG-Lola EX257 | MG XP20 2.0L Turbo I4 | 19 | 16 | 20 | 13 | 16 | 16 | 16 | 20 | 22 | 16 | 174 |
| 3 | Autocon Motorsports | Riley & Scott Mk III C | Élan 6L8 6.0L V8 | 10 | 10 | 16 | 9 | 45 | ||||||
| 4 | Zytek Motorsports | Zytek 04S | Zytek ZG348 3.4L V8 | 10 | 23 | 33 |
LMP2 Standings
| Pos | Team | Chassis | Engine | Rd 1 | Rd 2 | Rd 3 | Rd 4 | Rd 5 | Rd 6 | Rd 7 | Rd 8 | Rd 9 | Rd 10 | Total |
| 1 | Intersport Racing | Lola B2K/40 Lola B05/40 | Judd KV675 3.4L V8 AER P07 2.0L Turbo I4 | 20 | 16 | 20 | 20 | 20 | 26 | 11 | 133 | |||
| 2 | Miracle Motorsports | Courage C65 | AER P07 2.0L Turbo I4 | 26 | 20 | 16 | 20 | 16 | 19 | 117 | ||||
| 3 | B-K Motorsports | Courage C65 | Mazda R20B 2.0L 3-rotor | 16 | 20 | 13 | 16 | 13 | 22 | 16 | 116 | |||
| 4 | Van der Steur Racing | Lola B2K/40 | AER P07 2.0L Turbo I4 | 13 | 16 | 16 | 13 | 58 | ||||||
| 5 | Penske Racing | Porsche RS Spyder | Porsche MR6 3.4L V8 | 23 | 23 | |||||||||
| 6 | BAT Competition | Lola B2K/40 | AER P14 3.0L V6 | 19 | 19 |
GT1 Standings
| Pos | Team | Chassis | Engine | Rd 1 | Rd 2 | Rd 3 | Rd 4 | Rd 5 | Rd 6 | Rd 7 | Rd 8 | Rd 9 | Rd 10 | Total |
| 1 | Corvette Racing | Chevrolet Corvette C6.R | Chevrolet 7.0L V8 | 22 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 26 | 23 | 211 |
| 2 | ACEMCO Motorsports | Saleen S7R | Ford 7.0L V8 | 16 | 10 | 13 | 13 | 13 | 6 | 13 | 19 | 11 | 114 | |
| 3 | Carsport America | Dodge Viper GTS-R | Dodge 8.0L V10 | 10 | 6 | 6 | 8 | 8 | 10 | 8 | 10 | 9 | 75 | |
| 4 | Pacific Coast Motorsports | Chevrolet Corvette C5-R | Chevrolet 7.0L V8 | 12 | 8 | 10 | 8 | 6 | 13 | 8 | 65 | |||
| 5 | Aston Martin Racing | Aston Martin DBR9 | Aston Martin 6.0L V12 | 26 | 22 | 16 | 64 |
- Note - Although Maserati Corse was allowed to race the non-homologated Maserati MC12, it was not allowed to score championship points.
GT2 Standings
| Pos | Team | Chassis | Engine | Rd 1 | Rd 2 | Rd 3 | Rd 4 | Rd 5 | Rd 6 | Rd 7 | Rd 8 | Rd 9 | Rd 10 | Total |
| 1 | Petersen/White Lightning | Porsche 911 GT3-RSR | Porsche 3.6L Flat-6 | 26 | 13 | 16 | 16 | 16 | 3 | 20 | 20 | 26 | 23 | 179 |
| 2 | Alex Job Racing | Porsche 911 GT3-RSR | Porsche 3.6L Flat-6 | 16 | 20 | 20 | 20 | 20 | 16 | 16 | 22 | 11 | 161 | |
| 3 | Flying Lizard Motorsports | Porsche 911 GT3-RSR | Porsche 3.6L Flat-6 | 19 | 10 | 6 | 13 | 10 | 13 | 13 | 10 | 19 | 13 | 126 |
| 4 | BAM! | Porsche 911 GT3-RSR | Porsche 3.6L Flat-6 | 4 | 8 | 2 | 13 | 16 | 10 | 13 | 14 | 16 | 96 | |
| 5 | J3 Racing | Porsche 911 GT3-RSR | Porsche 3.6L Flat-6 | 22 | 6 | 13 | 8 | 6 | 6 | 2 | 8 | 12 | 9 | 92 |
| 6 | Panoz Motor Sports | Panoz Esperante GT-LM | Ford 5.0L V8 | 20 | 10 | 6 | 8 | 10 | 8 | 4 | 19 | 85 | ||
| 7 | The Racer's Group | Porsche 911 GT3-RSR | Porsche 3.6L Flat-6 | 16 | 16 | |||||||||
| 8 | IN2 Racing | Porsche 911 GT3-RSR | Porsche 3.6L Flat-6 | 14 | 14 | |||||||||
| 9 | ZIP Racing | Porsche 911 GT3-R | Porsche 3.6L Flat-6 | 12 | 12 |