Ten teams representing eight different owner groups recently tested the new electronic fuel-injected vehicles that NASCAR will soon be incorporating into all of their races after the upcoming Talladega race.

It was the second race this week and the fourth of six total for the new carburetor-less cars. At this particular test, Hendrick Motorsports, Joe Gibbs Racing, Penske Racing, Michael Waltrip Racing, Earnhardt-Ganassi Racing and Stewart-Haas Racing each had one team. Roush Fenway Racing and Richard Childress Racing each sent two teams.

Trevor Bayne, racing in the car normally reserved for Greg Biffle, had the fastest time in the test. He was followed closely by Dave Ragan and Mike Skinner.

The changes came because NASCAR is looking to discourage the two-man drafts that have dominated racing lately, instead emphasizing the traditional "pack" racing. However, not all drivers believe that the switch to fuel injection will have major changes.

"They've changed some of the cooling things with the popoff valve and they've changed the restrictor plate," Kyle Busch told Autoweek. "They're trying to separate us from each other, which is fine. I don't have a problem with that. Will we see a much different race? Probably not; maybe just a little bit more swapping between cars."