BRISTOL, Tenn. : NASCAR’s second stop at a short track this season is yet another race that’s impossible to predict. There’s a new rules package, a traction strip around Bristol Motor Speedway and the general crankiness that short-track racing tends to produce.

Moods were mixed following Saturday’s final practice and defending race winner Kyle Busch was less than pleased with how conditions are coming together. He was the fastest Toyota driver of the session, fifth overall, but got prickly when asked how he expected Sunday’s race to go under NASCAR’s high-downforce rules package.