David Reynolds has topped this morning's practice session at the WD-40 Phillip Island SuperSprint after a last minute driver change this morning.
Thirty minutes before practice, Lucas Dumbrell Motorsport's Nick Percat suffered a flare up with his injured foot and was unable to get into the car.
Dumbrell's Bathurst winning brother Paul Dumbrell - on his way to the circuit - jumped in at the last minute, combining pieces of his race gear that had been transported for him by Triple Eight after the endurance races.
The #222 car was black flagged almost immediately, with Dumbrell rolling back into pit lane and signing the official forms while seated in the car.
Dumbrell finished the session 24th -his first time driving the Triple Eight-built LDM Commodore.
Meanwhile David Reynolds has topped the timesheets with a 1min30.8661 lap, 0.03sec ahead of Jamie Whincup after the 15-minute run.
"We didn't do much dry running yesterday so most people had new tyres on then, but it's really good for us -hopefully we can carry it into qualifying," Reynolds said.
He sits second in the Championship with a 239-point gap to leader Mark Winterbottom, and a one-point advantage over Craig Lowndes.
"This is what my whole career is about, trying to win the championship and this is the closest I've ever been," Reynolds said. "It's a good feeling - obviously enjoying this as much as I can."
Last year's Phillip Island race winner Scott McLaughlin came home third, with Championship leader Mark Winterbottom fourth in the order after practice.