| | No. | Class | Team | Drivers | Car | Time | Session |
| 1 | 10 | DP | SunTrust Racing | Max Angelelli
Pedro Lamy
Ricky Taylor
Wayne Taylor | Dallara Ford | 1:40.466 | Practice 1 (Fri) |
| 2 | 02 | DP | Chip Ganassi with Felix Sabates | Scott Dixon
Dario Franchitti
Jamie McMurray
Juan Pablo Montoya | Riley BMW | 1:40.588 | Practice 1 (Fri) |
| 3 | 6 | DP | Michael Shank Racing | AJ Allmendinger
Mark Patterson
Ricky Taylor
Michael Valiante | Riley Ford | 1:40.963 | Practice 1 (Fri) |
| 4 | 01 | DP | Chip Ganassi with Felix Sabates | Marino Franchitti
Scott Pruett
Memo Rojas
Justin Wilson | RileyBMW | 1:40.986 | Practice 1 (Fri) |
| 5 | 55 | DP | Level 5 Motorsports | Christophe Bouchut
Ryan Hunter-Reay
Lucas Luhr
Scott Tucker
Richard Westbrook | Riley BMW | 1:41.121 | Practice 1 (Fri) |
| 6 | 99 | DP | GAINSCO / Bob Stallings | Jon Fogarty
Alex Gurney
Jimmy Vasser
Jimmie Johnson | Riley Chevrolet | 1:41.319 | Practice 8 (Sun) |
| 7 | 60 | DP | Michael Shank Racing | Burt Frisselle
Oswaldo Negri
John Pew
Mark Wilkins | Riley Ford | 1:41.766 | Practice 7 (Sun) |
| 8 | 59 | DP | Brumos Racing | David Donohue
Hurley Haywood
Darren Law
Butch Leitzinger
Raphael Matos | Riley Porsche | 1:41.768 | Practice 8 (Sun) |
| 9 | 95 | DP | Level 5 Motorsports | Christophe Bouchut
Sebastien Bourdais
Emmanuel Collard
Sascha Maassen
Scott Tucker | Riley BMW | 1:41.933 | Practice 8 (Sun) |
| 10 | 77 | DP | Doran Racing | Memo Gidley
Fabrizio Gollin
Derek Johnston | Dallara Ford | 1:42.189 | Practice 1 (Fri) |
| 11 | 75 | DP | Krohn Racing | Colin Braun
Nic Jonsson
Tracy Krohn
Ricardo Zonta | Lola Ford | 1:42.224 | Practice 7 (Sun) |
| 12 | 9 | DP | Action Express Racing | Joao Barbosa
Terry Borcheller
Ryan Dalziel
Mike Rockenfeller | Riley Porsche | 1:42.345 | Practice 8 (Sun) |
| 13 | 90 | DP | Spirit Of Daytona | Antonio Garcia
Darren Manning
Paul Menard
Buddy Rice | Coyote Porsche | 1:42.443 | Practice 5 (Sat) |
| 14 | 7 | DP | Starworks Motorsport | Kasper Andersen
Mike Forest
Bill Lester
Dion von Moltke | Riley BMW | 1:42.923 | Practice 8 (Sun) |
| 15 | 41 | GT | Dempsey Racing / Team Seattle | James Gue
Leh Keen
Don Kitch Jr
Dave Lacey | Mazda RX-8 | 1:49.214 | Practice 6 (Sat) |
| 16 | 23 | GT | Alex Job Racing | Jack Baldwin
Claudio Burtin
Dominik Farnbacher
Mitch Pagerey
Martin Ragginger | Porsche GT3 | 1:49.627 | Practice 7 (Sun) |
| 17 | 71 | GT | TRG | Timo Bernhard
Kevin Buckler
Romain Dumas
Tim George Jr
Bobby Labonte
Spencer Pumpelly | Porsche GT3 | 1:49.700 | Practice 8 (Sun) |
| 18 | 67 | GT | TRG / Flying Lizard Motorsports | Jorg Bergmeister
Patrick Long
Seth Neiman
Johannes van Overbeek | Porsche GT3 | 1:49.730 | Practice 7 (Sun) |
| 19 | 70 | GT | SpeedSource | Jonathan Bomarito
Nick Ham
David Haskell
Sylvain Tremblay | Mazda RX-8 | 1:49.770 | Practice 7 (Sun) |
| 20 | 57 | GT | Stevenson Motorsports | Andrew Davis
Robin Liddell
Jan Magnussen | Camaro GT.R | 1:49.835 | Practice 6 (Sat) |
| 21 | 66 | GT | TRG | Ted Ballou
Kelly Collins
Patrick Flanagan
Wolf Henzler
Andy Lally | Porsche GT3 | 1:50.067 | Practice 7 (Sun) |
| 22 | 69 | GT | SpeedSource | Emil Assentato
Anthony Lazzaro
Nick Longhi
Jeff Segal | Mazda RX-8 | 1:50.082 | Practice 8 (Sun) |
| 23 | 94 | GT | Turner Motorsport | Bill Auberlen
Paul Dalla Lana
Joey Hand
Boris Said | BMW M6 | 1:50.308 | Practice 8 (Sun) |
| 24 | 88 | GT | Orbit Racing | G. John Baker
Guy Cosmo
Johnny Mowlem
Lance Willsey | Porsche GT3 | 1:50.373 | Practice 8 (Sun) |
| 25 | 40 | GT | Dempsey Racing | Patrick Dempsey
Charles Espenlaub
Joe Foster
Scott Maxwell | Mazda RX-8 | 1:50.396 | Practice 7 (Sun) |
| 26 | 30 | GT | Racers Edge Motorsports | Glenn Bocchino
Jade Buford
Todd Lamb
Jordan Taylor | Mazda RX-8 | 1:50.585 | Practice 7 (Sun) |
| 27 | 07 | GT | Godstone Ranch Motorsports / Team MBR | Paul Edwards
Davy Jones
John McCutcheon
Leighton Reese
Scott Russell | Corvette | 1:50.815 | Practice 7 (Sun) |
| 28 | 44 | GT | Magnus Racing | Jeroen Bleekemolen
John Potter
Craig Stanton | Porsche GT3 | 1:50.883 | Practice 8 (Sun) |
| 29 | 64 | GT | JLowe Racing | Jim Lowe
Eric Lux
Jim Pace
Tim Sugden
James Walker | Porsche GT3 | 1:51.137 | Practice 8 (Sun) |
| 30 | 43 | GT | Team Sahlen | Joe Sahlen
Will, Wayne, Joe
Nonnamaker | Mazda RX-8 | 1:51.138 | Practice 8 (Sun) |
| 31 | 63 | GT | TRG | Zak Brown
Richard Dean
Henri Richard
Mark Thomas
Rene Villeneuve | Porsche GT3 | 1:51.227 | Practice 5 (Sat) |
| 32 | 48 | GT | Miller Barrett Racing | Luke Hines
Peter Ludwig
Bryce Miller
Kevin Roush | Porsche GT3 | 1:51.575 | Practice 7 (Sun) |
| 33 | 20 | GT | Matt Connolly Motorsports | Christophe Lapierre
Jos Menten
Markus Palttala
Oskar Slingerland | Porsche GT3 | 1:52.044 | Practice 8 (Sun) |
| 34 | 97 | GT | Stevenson Motorsports | Matt Bell
Mike Borkowski
Brady Refenning
Gunter Schaldach | Camaro GT.R | 1:52.217 | Practice 7 (Sun) |
| 35 | 33 | GT | Bullet Racing | Ross Bentley
Sean McIntosh
Kees Nierop
Darryl O'Young
Steve Paquette | Porsche GT3 | 1:52.525 | Practice 8 (Sun) |
| 36 | 14 | GT | Autometrics Motorsports | David Baum
Cory Friedman
Glen Gatlin
Daniel Graeff
Ron Yarab Jr. | Porsche GT3 | 1:52.885 | Practice 8 (Sun) |
| 37 | 42 | GT | Team Sahlen | Joe Sahlen
Will, Wayne, Joe
Nonnamaker | Mazda RX-8 | 1:53.221 | Practice 7 (Sun) |
| 38 | 46 | GT | Autohaus Motorsports | Romain Ianetta
Shane Lewis
Richard Zahn | Pontiac GXP.R | 1:53.587 | Practice 6 (Sat) |
| 39 | 18 | GT | TRG / Guardian Angel | Peter Bassett
Bob Doyle
Travis Hill
Bruce Ledoux
David Quinlan | Porsche GT3 | 1:54.219 | Practice 5 (Sat) |
| 40 | 21 | GT | Matt Connolly Motorsports | Mauro Casedei
Peter London
Gabrio Rosa | Pontiac GTO.R | 1:56.072 | Practice 6 (Sat) |
