| | No. | Class | Team | Drivers | Car | |
| 1 | 15 | LMP2 | Lowe's Fernandez Racing | Adrian Fernandez
Luis Diaz | Lola B06/43 Acura | 1.11.677 |
| 2 | 6 | LMP2 | Penske Motorsports | Sascha Maassen
Ryan Briscoe | Porsche RS Spyder | 1.12.149 |
| 3 | 7 | LMP2 | Penske Motorsports | Timo Bernhard
Romain Dumas | Porsche RS Spyder | 1.12.222 |
| 4 | 26 | LMP2 | Andretti Green Racing Inc. | Bryan Herta
Tony Kanaan | Acura ARX-01a Acura | 1.12.532 |
| 5 | 1 | LMP1 | Audi Sport North America | Allan McNish
Rinaldo Capello | Audi R10 | 1.12.783 |
| 6 | 9 | LMP2 | Highcroft Racing | David Brabham
Stefan Johansson
Robbie Kerr | Acura ARX-01a Acura | 1.12.792 |
| 7 | 16 | LMP2 | Dyson Racing Team | Andy Wallace
Butch Leitzinger | Porsche RS Spyder | 1.12.827 |
| 8 | 20 | LMP2 | Dyson Racing Team | Chris Dyson
Guy Smith | Porsche RS Spyder | 1.12.846 |
| 9 | 2 | LMP1 | Audi Sport North America | Marco Werner
Mike Rockenfeller | Audi R10 | 1.12.854 |
| 10 | 5 | LMP2 | Zytek Motorsport | Hayanari Shimoda
Stefan Mucke | Zytek 07S | 1.14.312 |
| 11 | 06 | LMP1 | Team Cytosport | Klaus Graf
Greg Pickett | Lola B06 / 10 AER | 1.15.457 |
| 12 | 37 | LMP1 | Intersport Racing | Jon Field
Clint Field
Richard Berry | Lola B06 / 10 AER | 1.16.226 |
| 13 | 88 | LMP1 | Creation Autosportif | Jamie Campbell-Walter
Harold Primat | Creation CA07 Judd | 1.16.282 |
| 14 | 8 | LMP2 | B-K Motorsports | Jamie Bach
Ben Devlin | Lola B07/40 Mazda | 1.16.302 |
| 15 | 10 | LMP1 | Arena International Motorsport | Tom Chilton
Darren Manning | Zytek 07S | 1.17.220 |
| 16 | 3 | GT1 | Corvette Racing | Johnny O'Connell
Jan Magnussen | Corvette C6.R | 1.20.644 |
| 17 | 12 | LMP1 | Autocon Motorsports | Tony Burgess
Chris McMurry
Bryan Willman | Creation CA06/H Judd | 1.20.904 |
| 18 | 4 | GT1 | Corvette Racing | Oliver Gavin
Olivier Beretta | Corvette C6.R | 1.20.940 |
| 19 | 62 | GT2 | Risi Competizione | Mika Salo
Jaime Melo | Ferrari 430 GTC | 1.23.819 |
| 20 | 71 | GT2 | Tafel Racing | Wolf Henzler
Dominik Farnbacher | Porsche 997 GT3-RSR | 1.23.970 |
| 21 | 45 | GT2 | Flying Lizard Motorsports | Johannes van Overbeek
Jorg Bergmeister | Porsche 997 GT3-RSR | 1.24.091 |
| 22 | 31 | GT2 | Petersen / White Lightning | Michael Petersen
Peter Dumbreck
Lucas Luhr | Ferrari 430 GTC | 1.24.096 |
| 23 | 18 | GT2 | Rahal Letterman Racing | Ralf Kelleners
Tom Milner | Porsche 997 GT3-RSR | 1.24.565 |
| 24 | 21 | GT2 | Panoz Team PTG | Bill Auberlen
Joey Hand | Panoz Esperante GTLM | 1.25.126 |
| 25 | 61 | GT2 | Risi Competizione | Tracy Krohn
Nic Jonsson | Ferrari 430 GTC | 1.25.469 |
| 26 | 54 | GT2 | Team Trans Sport Racing | Tim Pappas
Terry Borcheller | Porsche 997 GT3-RSR | 1.25.608 |
| 27 | 44 | GT2 | Flying Lizard Motorsports | Seth Neiman
Lonnie Pechnik
Darren Law | Porsche 997 GT3-RSR | 1.25.775 |
| 28 | 73 | GT2 | Tafel Racing | Jim Tafel
Nathan Swartzbaugh
Lars Erik Nielsen | Porsche 997 GT3-RSR | 1.26.118 |
| 29 | 11 | GT2 | Primetime Race Group | Chapman Ducote
Joel Feinburg | Dodge Viper Competition Coupe | 1.29.567 |
| 30 | 53 | GT2 | Robertson Racing LLC | Andrea Robertson
David Robertson
David Murry | Panoz Esperante GTLM | 1.34.816 |
