Tony Stewart opened Speedweeks with a weighty — and heated — issue.

Stewart was visibly upset Friday as he stormed through the garage after getting black flagged for failing to step on a scale before getting behind the wheel.

Stewart was one of 25 drivers practicing for Saturday night's exhibition Sprint Unlimited, but one of just a few who didn't weigh in before the session started.

NASCAR flagged Stewart, ordering him back to the garage area to get weighed. But he refused, and when he did finally park his car after his practice run ended, Stewart and crew chief Chad Johnston were called to the NASCAR hauler for what likely was a stern lecture about following the rules.

They emerged about 10 minutes later, and Stewart headed straight for the scale.