2002–2004 Franchitti made his debut in CART's rival franchise the
Indy Racing League (IRL) in the
2002 IRL season, driving Team Green's unique No. 27
Dallara IR02-
Chevrolet Indy V8 entry for the
Indianapolis 500 after the team found funding for the programme. Starting from 28th, Although he wanted to remain a CART driver because of the series' competition and variety, Franchitti moved to the IRL for the
2003 season with the renamed Andretti Green Racing team (AGR) following his rejection of an offer to drive for
Newman/Haas Racing in place of
Christian Fittipaldi. Franchitti changed his driving style to handle the lighter and more responsive normally-aspirated, V8-engined car on short oval circuits, and improved his hand-eye-foot coordination. After competing in the season's first two races, finishing seventh in the season-opening round at Homestead, Franchitti finished fourth in the Honda Indy 225—his season's best finish—before requiring season-ending keyhole surgery to strengthen his back. Franchitti extended his contract to remain at AGR for the
2004 IndyCar Series. After crashing out of the season's opening two races at
Homestead and
Phoenix International Raceway, Franchitti had the first top-ten finish of his campaign at
Motegi. Four races later, in the
Menards A. J. Foyt 225, he led a race-high 111 laps to clinch his first IndyCar victory. Three races later, Franchitti had his second series win in the Honda Indy 225 at Pikes Peak. For the rest of the season, Franchitti finished no higher than third and placed sixth in the championship standings with 409 points. A second-place finish at the season's seventh round at
Richmond Raceway was his best result over the season's opening nine rounds. The following seven rounds saw Franchitti achieve two more podium finishes with a second-place finish at the next race at the Milwaukee Mile and a third-place result at
Watkins Glen International. Franchitti finished fourth overall with 498 points. His performance declined after
Team Penske and
Chip Ganassi Racing (CGR) became more developed when IndyCar used only Honda engines, and AGR underperformed on short high-speed oval tracks. He took pole position for the
Honda Grand Prix of St. Petersburg street course race where suspension failure after colliding with
Kosuke Matsuura's damaged car eliminated him from contention. Franchitti qualified 17th for the
Indianapolis 500 and came seventh after a late race pit stop for fuel. His final eight races yielded a season-best finish of second at the
Indy Grand Prix of Sonoma and four top-nine finishes. He was eighth in the points standings with 311 points. He began the year by finishing the opening four races seventh and above, including podium finishes at Motegi and
Kansas Speedway. After finishing second at the
ABC Supply Company A.J. Foyt 225 to take the championship lead, Franchitti won consecutive races in the inaugural
Iowa Corn Indy 250 at
Iowa Speedway, and led a race-high 242 laps in the
SunTrust Indy Challenge from pole position. Franchitti took two pole positions at
Michigan International Speedway and Infineon Raceway and four top-three finishes over the next seven races to enter the season-ending
Peak Antifreeze Indy 300 three points ahead of CGR's
Scott Dixon. Franchitti won the race after Dixon's car ran out of fuel on the final lap, securing his first IndyCar championship.
Dodge Charger in the 2007 Ford 300 Franchitti considered joining
NASCAR but discussions with CGR team owner
Chip Ganassi and
Richard Childress Racing owner
Richard Childress did not result in a race seat. Talks with Ganassi resulted in Franchitti replacing
David Stremme as the driver of the No. 40
Dodge Charger on a multi-year contract from 2008 because of Stremme's sponsorship problems, and because they believed Franchitti was more marketable, a decision that greatly upset AGR. Franchitti was enrolled onto a stock car development programme that involved
ARCA and the
Busch Series events, as well as testing. He made his stock car racing debut in the ARCA Re/Max 250, qualifying seventh and finishing seventeenth in the No. 42 CGR Dodge. Two weeks later, Franchitti entered one race in the
Craftsman Truck Series—the
Kroger 200—for CGR in
Cunningham Motorsports' No. 41
Dodge Ram, starting 30th and finishing 33rd after an accident. In the
2007 Busch Series, Franchitti drove in four races in CGR's No. 42 Dodge Charger, achieving a best starting position of third in the
Sam's Town 250 and a best finish of 25th in the
O'Reilly Challenge. During the
2008 NASCAR Sprint Cup Series, he entered fourteen races, qualified for ten with an average start of 28.4 and finish of 34.3 with two did not finishes. Franchitti's season-best finish was a 22nd place in the
Goody's Cool Orange 500 and his best qualifying performance was seventh in the
Lenox Industrial Tools 301. He fell outside the top-35 in the points standings that he had inherited from the preceding season and was required to qualify on speed from the sixth race onwards, because his car was uncompetitive since CGR could not master the
Car of Tomorrow concept. Franchitti's Sprint Cup Series team funded by Chip Ganassi was disbanded by Ganassi and co-owner
Felix Sabates in July 2008 due to the trouble of retaining major sponsorship funding. Early in 2008, Franchitti entered the season-opening
ARCA Re/Max Series race the
ARCA 200 at Daytona in CGR's No. 40 Dodge, qualifying ninth and finishing tenth. He qualified CGR's No. 40 Dodge in fourteen races in the renamed
Nationwide Series, achieving two top-ten finishes with an average start of 12.6 and an average finish of 17.6. Franchitti's best series finish was a fifth place at the
Zippo 200 at the Glen, where he started from pole position. During the
Aaron's 312, Franchitti's right-rear tyre failed early in the event, causing a major accident with
Larry Gunselman and leaving Franchitti with a minor left-ankle fracture. Franchitti was replaced by Stremme,
Ken Schrader,
Jeremy Mayfield and
Sterling Marlin during his recovery.
2009–2013 Franchitti considered returning to IndyCar while spectating the
2008 Indianapolis 500. The introduction of new road and street circuits (particularly the
Grand Prix of Toronto) to the IndyCar Series following the unification of the
Champ Car World Series and the IRL sanctioning bodies in 2008 renewed Franchitti's interest in open-wheel racing. Therefore, he signed a multi-year contract with CGR to replace Wheldon starting from the
2009 season. Franchitti wanted to join CGR's No. 41 NASCAR Cup Series team before being reminded of the capability of IndyCars. After finishing fourth in the season-opening
Honda Grand Prix of St. Petersburg, Franchitti finished seventh and above in the next three races and took pole position for the
Bombardier Learjet 550. Following his taking pole position for the
SunTrust Indy Challenge, Franchitti led 45 laps of the
Honda Indy Toronto from pole position to win the race. He had three more top-six finishes before leading the
Indy Grand Prix of Sonoma from pole position, winning his fourth race of 2009. Two more top-four finishes put him five points behind Dixon going into the season-ending
Firestone Indy 300. Franchitti won the race from pole position, winning his second championship and finishing the year eleven points ahead of Dixon. In the
2010 season, Franchitti returned to CGR to defend his title. He finished third in the
Indy Grand Prix of Alabama and second in the
RoadRunner Turbo Indy 300. Franchitti achieved consecutive podium finishes in the
Honda Indy Toronto and the
Honda Indy Edmonton in the following five races. A fifth place at
Kentucky Speedway and a second place at Motegi put him 12 points behind Penske's
Will Power before the season-closing
Cafés do Brasil Indy 300 and won the inaugural
A. J. Foyt Oval Track Championship with a round to spare. By finishing eighth, Franchitti won his second-consecutive championship and third overall after Power's crash. For the
2011 season, Franchitti rejoined CGR for his second successive title defence. He finished third in the
Indy Grand Prix of Alabama and the following
Toyota Grand Prix of Long Beach, then won the first of the
Firestone Twin 275s after leading 110 laps. Franchitti led 161 laps of the
Milwaukee 225 from pole position in his third victory of the season, and won the
Honda Indy Toronto two races later. The next seven races saw him finish second at
Mid-Ohio and Kentucky, third at Edmonton and took another pole position at
New Hampshire. The race was abandoned following a 15-car accident on the 11th lap that involved Power and caused Wheldon's death, meaning Franchitti won his fourth championship; his third in succession. Franchitti drove for CGR for the
2012 season; he initially struggled to adapt to the new
Dallara DW12 car before becoming more competitive following the season's fourth event, which was held in
São Paulo, Brazil. Franchitti took two top-ten finishes in the first four races, placing tenth at Barber and fifth in São Paulo. Franchitti's performance for the rest of the season was sub-par: he had four pole positions that did not result in a race win and three more podium finishes. He was seventh in the Drivers' Championship with 363 points. Franchitti qualified on pole position for the
Toyota Grand Prix of Long Beach, which he finished fourth. He finished the race in 27th.
Career-ending accident and mentoring On the final lap of the second race of the
2013 Shell-Pennzoil Grand Prix of Houston doubleheader on 6 October, Franchitti's car collided with the rear of Sato's car in turn five, and was launched into the
catchfence. Franchitti's car ripped apart a fence section and sent debris into the grandstand past a second fence ahead of spectators. The car ricocheted back onto the circuit, spinning multiple times before stopping. Franchitti's car settled driver side up on the racing surface; the car's front was removed but the
chassis's tub portion remained intact. When
E. J. Viso arrived at the crash site, he hit Sato's stationary wrecked car. Franchitti travelled to Indianapolis for surgery to repair the right
talus bone connecting the leg and the foot. On 18 October, Franchitti was released from the Indianapolis hospital. After seeing a doctor in Miami for neurological examinations and a
magnetic resonance imaging (MRI) scan that produced negative results, Franchitti travelled to Scotland in November for rest. Franchitti retired from competitive driving after doctors advised him his injuries and those from previous accidents put him at risk of permanent paralysis and brain damage in the event of another major crash. Franchitti's memory, decision-making skills and concentration levels have suffered because of the crash. Franchitti has worked for CGR as an advisor and driver-coach to each of the team's racers since the
2014 IndyCar Series after he was offered the job by Ganassi. Franchitti provides performance advice to CGR's racers and engineers. He did not want to be a team owner because he believed the financial risks of ownership were too great. == Other racing ventures ==