The track, two football fields long, was modeled on Mattel's Hot Wheels Double Dare Snare toy racetrack set. Foust and Tracy smashed the previous record for the largest loop in a car, set at 42 feet in September 2011 by Chinese driver Li Yatao in a Lotus 5 Sportback for Zhejiang Youngman Lotus Automobile Co., Ltd. in Shanghai.

"The moment when it's go time, the heart rate slows down, the adrenaline goes away and it's a matter of letting it happen," Foust said.

Foust and Tracy hit 52 mph in the track and experienced approximately 7Gs going through the loop.

"That was pretty hardcore: the 7 Gs … I almost felt my chin hit my lap, I think, in the loop," Foust said after finishing the stunt in the Team Yellow car. "I felt like I was in a toy."

To avoid passing out from the force of seven times gravity, Foust's strategy was to "grunt, tighten your core and try to make your eyeballs and veins pop out."

After the drivers shift from first gear to second gear, the hand control takes over and, Foust said, "It's a matter of following the black line and not passing out."

Said Tracy: "It doesn't just happen on the day, it's something we've been working on for a year. When I heard the countdown, I was ready to go."

Foust, a three-time X Games gold medalist, will be looking to add to his collection in Sunday's RallyCross final at X Games LA, the third of five stops on the 2012 Global RallyCross tour. The X Games RallyCross finals will be airing on ESPN2 and ESPN3D from 3 p.m. to 5 p.m. ET Sunday.