Nine former Champ Car entries will be on the 26-car grid for the first round of the merged IRL IndyCar Series at Homestead next weekend.
HVM Racing have confirmed that former GP2 driver Ernesto Viso will race their single-car entry, and Keith Wiggins' squad will be joined in the field by two-car teams from fellow Champ Car converts Newman/Haas/Lanigan, KV Racing, Conquest Racing and Dale Coyne Racing.
They will share the grid with 15 existing IndyCar Series regulars, plus former occasional entrants Roth Racing, who are expanding to a full-time two-car programme for team owner Marty Roth and former Indy Pro Series champion Jay Howard.
The Homestead entry is the largest for an American open-wheel season-opener since Champ Car attracted 28 cars to its first round in 2001. That season's IRL opener at Phoenix boasted a 27-car field.
Last year Champ Car could only field 17 cars per race, while the IndyCar Series saw 18 cars at most rounds except Indianapolis.
Additional part-time entries are set to boost the field at several IndyCar events. Sarah Fisher is to run a partial season with her own newly-formed team, and Tomas Scheckter will compete in three rounds with the Penske-affiliated Luczo Dragon Racing.
Of the remaining former Champ Car teams, Forsythe Racing will only compete at Long Beach, while Walker Racing still intend to race in the IRL if they can find sufficient sponsorship after parting with former team co-owner Craig Gore.
Rocketsports and Pacific Coast Motorsports have not confirmed their plans yet, although PCM had originally hoped to put together a two-car IndyCar programme if possible.
Homestead entry list:
No Driver Team
2 AJ Foyt IV Vision Racing
3 Helio Castroneves Team Penske
4 Vitor Meira Panther Racing
5 Oriol Servia KV Racing Technology
6 Ryan Briscoe Team Penske
7 Danica Patrick Andretti Green Racing
8 Will Power KV Racing Technology
9 Scott Dixon Chip Ganassi Racing
10 Dan Wheldon Chip Ganassi Racing
11 Tony Kanaan Andretti Green Racing
14 Darren Manning AJ Foyt Racing
15 Buddy Rice Dreyer & Reinbold Racing
17 Ryan Hunter-Reay Rahal Letterman Racing
18 Bruno Junqueira Dale Coyne Racing
19 Mario Moraes Dale Coyne Racing
20 Ed Carpenter Vision Racing
23 Milka Duno Dreyer & Reinbold Racing
24 Jay Howard Roth Racing
25 Marty Roth Roth Racing
26 Marco Andretti Andretti Green Racing
27 Hideki Mutoh Andretti Green Racing
33 Ernesto Viso HVM Racing
34 Franck Perera Conquest Racing
36 Enrique Bernoldi Conquest Racing
02 Justin Wilson Newman Haas Lanigan Racing
06 Graham Rahal Newman Haas Lanigan Racing