FORT WORTH, Texas -- Cup drivers Tony Stewart, Kurt Busch, Greg Biffle and Brian Vickers became the first to conduct an on-track test with a new aluminum spoiler package that could be implemented for the 2010 season during the Goodyear Tire test at Texas Motor Speedway on Tuesday.

Stewart was the first of the group to test the spoiler in the morning session, which was delayed nearly two hours from its 9 a.m. CT start time due to moisture on the 1.5-mile, high-banked oval from heavy morning dew.

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"[The spoiler] was on a bunch. It didn't seem to be a big balance change which was good. That means you won't have to invent the wheel necessarily.

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-- TONY STEWART

The session kicked off at approximately 10:53 a.m. with temperatures in the 60s as Stewart rolled out with the wing and less than 40 minutes later was utilizing the spoiler. Vickers also got an opportunity to run the spoiler in the abbreviated morning session.

"[The spoiler] was on a bunch. It didn't seem to be a big balance change which was good," Stewart said. "That means you won't have to invent the wheel necessarily. It was a balance shift, but it wasn't a big balance shift.

"You've got two kinds of grip -- you've got aero grip and you've got mechanical grip. The spoiler is the aero grip and the tires are mechanical. The mechanical grip is real important because it doesn't know if you are running first in line or 10th in line. I'm more of a mechanical guy."

"I thought [the spoiler] was good," Vickers said. "I thought it added a little bit of front downforce, which is a good thing. I think it's going to be more accepted to the fans. It looks cooler -- a little more retro back to the older car.

"We haven't been in a lot of traffic yet, so the big question is how it's going to handle in traffic. Theoretically, from what I've been told, the difference between the two is that the spoiler is better in traffic. The spoiler is going to be more efficient in dirty air and a wing will be more efficient in clean air. Once you get in a lot of turbulence, the spoiler's not going to lose a lot of efficiency while a wing really will."

NASCAR has not determined the specific dimensions as yet for the spoiler, but the one that was being used as a baseline at Tuesday's session was 64.5 inches wide and four inches in height with no contour in the design. Also, the rear quarter panels were extended four inches toward the ground.

NASCAR phased out the traditional spoiler on the rear deck lid of the Cup cars and went to a rear wing when the [new car] was unveiled in 2007. The return to the traditional look provides fans with the ability to differentiate between the four manufacturers more easily and hopefully enhance the passing ability of the cars and overall race action. Tuesday's tire test was the first opportunity for drivers to test the package and provide feedback on its effects on the car.

"We've got one of the biggest spectator sports in America and [NASCAR] wants to keep it interesting," Biffle said. "[NASCAR] wants to keep our fans interested and they listen to the fans. [The fans] wanted double-file restarts and [NASCAR] did it, and a lot of fans don't like the wing because they say it's not traditional NASCAR. NASCAR asked us about [the change] and we thought it would be good to put a spoiler back on the car or at least try it. I think it will be good."

Biffle and Busch had to wait until the afternoon session to test out the spoiler, with Busch not getting an opportunity until nearly the culmination of the session.

"With the spoiler on, the car had a looser feel to it," Busch said. "The car was turning better and it felt like the car was sliding a bit more. When you 'A-B' the sets of tires -- like last year's tires that we won on -- and the tire that Goodyear wants to head in the general direction of, it tightened the car back up for a nice comfortable feel. And what we have to do ultimately is put together a better package for drivers to drive on the track which would create more side-by-side excitement for our fans to enjoy."

Stewart, Busch, Biffle and Vickers will conclude the Goodyear test Wednesday, where they are scheduled to test the spoiler package once again. NASCAR will conduct another test with the spoiler March 23-24 at Charlotte Motor Speedway -- another 1.5-mile oval and sister track to TMS -- that will be open to all Cup teams.

"I think we're stirring up the pot [with the change], but it's in a positive direction," Busch said. "A lot of times NASCAR throws changes our way and the drivers and owners grumble about it. With the spoiler, it seems like a positive reaction has been made already and just driving in it [Tuesday], I don't see any problem with it at all."

If NASCAR is pleased with the progress and performance of the spoiler, the new package could be implemented for the Samsung Mobile 500 scheduled for April 15-18 at Texas Motor Speedway.

Related:
• Wing to spoiler transition anticipated without dread