Garry Jacobson topped the opening practice session for the Dunlop Super2 Series at the Watpac Townsville 400 as he bids to revive his title challenge.
The Ford driver was the early pacesetter as the defending champion made the most of the fast but loose FG X package and set a 1:15.4429s lap mid-way through practice.
Jacobson sits seventh in the standings, 295 points adrift of leader Paul Dumbrell,
The Eggleston Motorsport driver finished second overall by 0.05s and ahead of Anton de Pasquale who continued his impressive form from the previous round at Phillip Island.
Macauley Jones led championship contenders Todd Hazelwood, Jack Le Brocq with Kurt Kostecki, Richard Muscat, Will Brown and Andrew Jones rounding out the top-10.
Shae Davies had his session halted by an electrical problem, with members of the Nissan Motorsport Supercars team assisting MW Motorsport to resolve the problem.
Team-mate Fullwood made a notable top-10 time in the first appearance for the Northern Territory product in the former Rick KellyNissan Altima.
Macauley Jones spun with 15 minutes remaining in first practice, with the Brad Jones Racing driver returning to the category after two wildcard starts in the main series.
Matt Chahda was handed a five minute penalty after taking to the circuit on an unmarked set of tyres.
Renee Gracie also ended her session early after reporting brake issues in the #98 Commodore.
Series newcomer Gerard McLeod ended the session in 23rd place after stepping up from the V8 Utes category.