2003
- Honda HI3R Series Indy V-8
- Honda debut in IndyCar series
- First Honda IRL pole Tony Kanaan, Miami-Homestead, March 2
- First Honda IRL race win Tony Kanaan, Phoenix International Raceway, March 23
- Honda wins two races and three poles
- Dan Wheldon wins Rookie of the Year
- Andretti Green Racing: Michael Andretti, Dario Franchitti, Tony Kanaan and Dan Wheldon
- Super Aguri Fernandez Racing: Roger Yasukawa
- Team Rahal: Kenny Brack
2004
- Honda HI4R Series Indy V-8
- Honda wins 14 of 16 races and 11 poles; wins Manufacturers' Championship, Drivers Championship (Tony Kanaan) and Rookie of the Year (Kosuke Matsuura)
- First Honda victory at Twin Ring Motegi, also first IRL victory for Dan Wheldon
- Honda/Buddy Rice win Indianapolis 500. Honda sweeps top seven spots
- Andretti Green Racing: Bryan Herta, Tony Kanaan, Dario Franchitti and Dan Wheldon
- Access Motorsports: Greg Ray & Mark Taylor
- Rahal Letterman Racing: Buddy Rice & Vitor Meira
- Super Aguri Fernandez Racing: Kosuke Matsuura
- Fernandez Racing: Adrian Fernandez
2005
- Honda HI5R Series Indy V-8
- Honda clinches 2005 Manufacturers' Championship at Pikes Peak with a victory by Dan Wheldon, Andretti Green Racing
- Wheldon clinches the IndyCar Drivers' Championship and Danica Patrick of Rahal Letterman Racing claims Rookie of the Year award at Watkins Glen
- Andretti Green Racing: Tony Kanaan, Dario Franchitti, Bryan Herta and Dan Wheldon
- Delphi Fernandez Racing: Scott Sharp
- Super Aguri Fernandez Racing: Kosuke Matsuura
- Rahal Letterman Racing: Buddy Rice, Vitor Meira and Danica Patrick
- Dreyer & Reinbold Racing: Roger Yasukawa