Talladega, AL (Best E Casino) - Twenty-five Sprint Cup Series teams participated in a one-day test session at Talladega Superspeedway to determine the potential size of carburetor restrictor-plate openings and familiarize drivers with the new rear spoiler on the current cars.

While no announcement has been made yet, NASCAR is expected to replace the rear wing with the spoiler on the Car of Tomorrow (COT) prior to the April 25 Aaron's 499 at Talladega.

The wing has been a fixture of the COT since its debut three years ago at Bristol, where the series runs later this week. Teams have raised concerns about the wing, since it has reduced downforce on the cars. The spoiler was used on the previous cars.

NASCAR has been looking at ways to improve the COT, particularly after Carl Edwards' spectacular crash last April at Talladega. Edwards' car flew into the safety fence along the frontstretch on the final lap, injuring several fans in the grandstands. The incident raised concerns about the car.

Teams used various plate hole sizes in Tuesday's testing at Talladega.

"With the bigger plate and the bigger spoiler, the car accelerates a lot faster," Martin Truex Jr. said. "The cars definitely get up to speed a lot quicker. They feel like they have a lot more drag on them."

The morning session featured single-car runs, while drafting took place later in the day.

"I felt like we learned some things, enough to where we could go ahead and start getting in the draft," Jeff Gordon said after the morning session. "There was about five of us out there. It was definitely productive. Nothing eye-opening. Felt like it went well. The cars have a little bit more turbulent air when you're behind other cars."

NASCAR might also make modifications to the restrictor plates for Talladega.

"Today is primarily a confirmation test that the gear ratio we select is right and is compatible with the restrictor plate size," NASCAR manager director of competition John Darby said.

NASCAR used a bigger restrictor plate for last month's Daytona 500 to allow drivers to have more horsepower. The size of the plate holes was increased to 63/64ths of an inch, making it the largest restrictor plate since the 1989 Daytona 500.