The 2006 SunTrust Indy Challenge presented by XM Satellite Radio was an IndyCar Series motor race held on June 24, 2006, in Richmond, Virginia at Richmond International Raceway. It was the seventh round of the 2006 IndyCar Series and the sixth running of the event. Sam Hornish Jr. of Marlboro Team Penske won the 250-lap race. Panther Racing driver Vítor Meira finished second, and Andretti Green Racing's Dario Franchitti took third.

Hélio Castroneves was awarded the pole position after qualifications were rained out. He led the first 38 laps before teammate Hornish Jr. overtook him for the first position. Hornish Jr. proceeded to lead the final 212 laps and win the race with little vying from the other competitors. His win, coupled with Castroneves' ninth-place finish after blowing a tire late in the race, allowed him to reduce Castroneves' Drivers' Championship lead to five points. Scott Dixon and Dan Wheldon dropped to third and fourth, respectively, while Meira moved to fifth with seven races remaining in the season.

Background

The SunTrust Indy Challenge was the seventh of 14 scheduled open-wheel races of the 2006 IndyCar Series and the sixth edition of the event. It was held on June 24, 2006, in Richmond, Virginia, United States, at Richmond International Raceway, a four-turn asphalt oval track which features 14-degree banking in the turns, 8-degree banking in the front stretch, and 2-degree banking in the back stretch, and contested over 250 laps and . Before the race, Marlboro Team Penske driver Hélio Castroneves, the defending race winner, led the Drivers' Championship with 232 points, twenty-two points ahead of Scott Dixon in second and thirty-seven points over Dan Wheldon in third. Sam Hornish Jr. and Tony Kanaan held the fourth and fifth positions, respectively.

To prepare for the race, IndyCar conducted a test at the circuit for the series' entrants on June 22; the sessions were exclusively opened to rookie drivers at 9:00 AM Eastern Daylight Time (EDT), paused from 11:00 AM to 1:30 PM, opened to all drivers at 2:00 PM, and concluded at 6:00 PM. All 19 full-time entries took part in the session, which was led by Hornish Jr. with a lap of 15.7520 seconds; however, Hornish Jr. had also brought the session to an early end after crashing into the SAFER barrier in the fourth turn, destroying his primary car in the process. He was closely trailed by Andretti Green Racing drivers Marco Andretti and Kanaan, while Scott Sharp and Dario Franchitti drove the fourth- and fifth-quickest laps of the session, respectively.

Hornish Jr. looked forward to the race weekend because of how fun he felt the circuit was. Castroneves was equally as optimistic and fondly reminisced his win at the track in 2005. After the test, Andretti instantly became fond of the track because of its emphasis on driver effort. Kanaan shared this sentiment and likened Richmond International Raceway to a road course. Franchitti spoke of the physical challenges while racing at the track, such as G-forces, but had hope that he could muster another good finish in the race. Buddy Rice, on the other hand, claimed that the track was not physically demanding, but mentally demanding because it tested drivers' patience.

Practice and qualifying Two practice sessions were held prior to the race on Saturday, both on Friday. The first session lasted for 90 minutes, and the second for 60 minutes; both sessions were divided into two groups which each received equal track time. The first session featured two stoppages, one for Buddy Lazier, who backed into the fourth-turn wall, and another for Felipe Giaffone, whose engine failed just eight laps into his run. Castroneves led the first session with a quick lap of 15.6043 seconds, ahead of Andretti, Kanaan, Kosuke Matsuura, and Hornish Jr. Castroneves later improved on his fastest time during the second and final session with a lap of 15.5645 seconds, besting Scott Sharp, Hornish Jr., Wheldon, and Andretti.

Forty-five minutes after the second practice session ended, the starting grid was set to be determined by the qualifying session. Each driver was required to complete two timed laps; the fastest time would determine the drivers' starting positions. After nine drivers completed their qualifying attempts, rain began to descend over the track, forcing IndyCar to cancel the session. The starting grid was resultantly determined by the combined practice speeds on Friday, which awarded Castroneves the pole position. He was joined on the grid's front row by Sharp; Hornish Jr., Wheldon, and Andretti took positions third through fifth, and Vítor Meira, Kanaan, Matsuura, Bryan Herta, and Franchitti qualified from sixth through tenth. The grid was rounded out by Dixon, Tomas Scheckter, Ed Carpenter, Rice, Danica Patrick, Jeff Simmons, Eddie Cheever, Giaffone, and Lazier.

Qualifying classification Driver Team 1 3 Hélio Castroneves Marlboro Team Penske 15.5645 173.4721 28 Scott Sharp Delphi Fernández Racing 15.6330 172.7122 36 Sam Hornish Jr. Marlboro Team Penske 15.6466 172.5613 410 Dan Wheldon Target Chip Ganassi Racing 15.6529 172.4924 526 Marco Andretti Andretti Green Racing 15.6915 172.0685 64 Vítor Meira Panther Racing 15.7002 171.9726 711 Tony Kanaan Andretti Green Racing 15.7022 171.9507 855 Kosuke Matsuura Super Aguri Fernández Racing 15.7158 171.8028 97 Bryan Herta Andretti Green Racing 15.7514 171.4139 1027 Dario Franchitti Andretti Green Racing 15.7645 171.27110 119 Scott Dixon Target Chip Ganassi Racing 15.7844 171.05511 122 Tomas Scheckter Vision Racing 15.8278 170.58612 1320 Ed Carpenter Vision Racing 15.8310 170.55113 1415 Buddy Rice Rahal Letterman Racing 15.8771 170.05618 1516 Danica Patrick Rahal Letterman Racing 15.8936 169.88014 1617 Jeff Simmons Rahal Letterman Racing 16.0425 168.30315 1751 Eddie Cheever Cheever Racing 16.0576 168.14516 1814 Felipe Giaffone A. J. Foyt Racing 16.5270 163.36917 195 Buddy Lazier Dreyer & Reinbold Racing 16.5290 163.34919 Sources:

Notes The starting grid was determined by the fastest speeds of Friday's two practice sessions. — Buddy Rice was sent to the rear of the grid because of a crash during the warm-up session.

Warm-up At 2:00 PM EDT, the drivers took to the track for a thirty-minute warm-up session leading up to the race. The session was briefly stopped three minutes after it began when Rice crashed into the SAFER barrier in the fourth turn. Hornish Jr. was the fastest driver of the session with a timed lap of 16.5691 seconds, ahead of Meira, Kanaan, Franchitti, and Wheldon.

Race The race began at 8:00 PM EDT and was broadcast live on ESPN2 in the United States. Commentary was provided by Marty Reid, while Scott Goodyear and Rusty Wallace took the roles of race analysts. An estimated 40,000 spectators were in attendance for the race. Weather conditions at the start of the race were cloudy, with air temperatures measuring at and track temperatures at . After Rice's crash in the warm-up session, his team replaced his motor and he was consequently placed in the 18th starting position as per IndyCar's rules. Veteran motorsports journalist Chris Economaki commanded the drivers to start their engines and three-time Indianapolis 500 winner Johnny Rutherford drove the pace car.

Castroneves utilized his pole position to his advantage when the green flag was waved and quickly began driving away from the other competitors. At the end of the first lap, Castroneves' teammate Hornish Jr. overtook Wheldon for the second position, while Andretti had also improved into the third position. Beginning on lap 15, Castroneves began maneuvering around lapped drivers, causing his gap over Hornish Jr. to dwindle within the next twenty laps. On the 39th lap, Hornish Jr. pulled ahead of Castroneves to take the lead in the first turn. Meira made his way up to the third position a lap later.

The first caution flag of the race was necessitated on lap 53, by which point Hornish Jr. had established a five-second lead over Castroneves, after debris was reported on the back stretch. All drivers chose to enter pit road for tires and fuel three laps later. Hornish Jr. and Castroneves preserved their respective positions, while Meira plummeted to tenth in the running order after his pit stop was elongated due to an issue with the impact wrench. Cheever was also sent to the rear of the field for exceeding the speed limit on pit road. Two laps after the lap 61 restart, Simmons slid up the track and crashed into the wall, bringing out the second caution and forcing him to retire. The only driver who entered pit road under this caution period was Rice, who received a beneficiary rule lap after the previous caution.

Hornish Jr. maintained the first position as the race restarted on lap 72 and amassed a 4.7-second lead over Castroneves by the 111th lap. Meanwhile, Kanaan, who was running in the fourth position, pulled off the track on lap 109 and confirmed his retirement from the race two laps later on account of a malfunctioning gear shift cable. On the 140th lap, Andretti overtook Castroneves for the second position. Eleven laps later, the third caution was displayed when debris was spotted in the second turn. Under the caution period, all drivers elected to make pit stops for new tires and fuel; some teams, including that of Hornish Jr., also made wing adjustments. Herta exited his pit stall while his fuel hose was still attached, sparking a small fire that was quickly extinguished. Franchitti's quick pit stop allowed him to advance from sixth to second.

After racing resumed on lap 164, Hornish Jr. continued his dominant pace, though he was steadily pursued by Franchitti. By virtue of lapped drivers, however, Hornish Jr. opened his gap over Franchitti to 7.6 seconds by lap 235. Meanwhile, Meira made an abrupt charge to the front of the field; he first passed Andretti for fourth place on lap 226 after Andretti oversteered and nearly spun exiting the second turn, then moved to third by overtaking Castroneves five laps later. Castroneves, meanwhile, began losing several positions after air pressure in his right-rear tire depleted. On the 240th lap, Wheldon's fuel tank ran dry because of a short pit stop on lap 153, forcing him to concede fifth place and enter pit road for a splash of fuel. Meira continued his late-race surge on lap 246 by steering to the inside on the front stretch and taking the second position from Franchitti, nearly driving into the grass in the process.

Seconds after Meira accomplished the pass, Castroneves' right-rear tire finally blew, triggering the fourth (and final) caution which proceeded in the final four laps. Hornish Jr. maintained his lead during the caution period and drove to his sixteenth IndyCar victory and second of the season, following his win in the Indianapolis 500 the month prior. Meira finished second for the sixth time in his career, ahead of Franchitti in third, Andretti in fourth, and Sharp in fifth. Herta, Scheckter, Carpenter, Wheldon, and Castroneves completed the top ten finishers and Dixon, Matsuura, Rice, Cheever, Patrick, Lazier, and Giaffone were the last of the classified finishers. The race had four cautions for 34 laps, a record-low amount for the series at the track, and one lead change among two drivers. Hornish Jr. led the final 212 laps en route to victory, marking the most consecutive laps ever led in a single IndyCar Series race.

Post-race