DAYTONA BEACH, Fla. (AP)—

Busch, the defending race winner of NASCAR’s Coke Zero 400, drove 70 minutes in his sports car series debut. He split the Chip Ganassi-owned ride with fellow NASCAR driver Scott Speed.

“Very, very, hot in those cars,” Busch said. “Just the biggest thing was to get some fluids back in me since I know I lost a ton of fluids. The faster you can get to the medical center after getting out of the car, the faster I could get taken care of and get some rest before tonight’s race.”

A spokesman for Busch said the driver received the IV as a precautionary measure.

Busch and Speed teamed to finish 10th in the race at Daytona International Speedway. He’d been lobbying Ganassi for a seat in the prestigious Rolex 24 hour race at Daytona, but Ganassi told him to try the 2-hour July race first.

That event had typically been run two days before the NASCAR race, but Grand-Am, which is now owned by NASCAR, moved it to Saturday afternoon as a doubleheader with the Sprint Cup Series.

The race was won by SunTrust Racing’s duo of Max Angelelli and Brian Frisselle.