Chris Ramsey was sacked as Queens Park Rangers boss last week.
The R’s placed Neil Warnock in temporary charge, and Luongo says that big changes were made under a new coaching regime.
"The next session is a lot more lively because guys are trying to impress and smash people trying to get their positions," Luongo said.
"Chris Ramsey had a lot of different styles in the way he coached because he was really involved in everything.
"It was a big change, the next session, we had a lot of shape in the next game."
Ramsey fell under pressure at QPR after their poor start to the campaign left them trailing the play-off pack by a considerable distance.
The R’s have made no secret of their desire to mount a promotion push, but they have ground to make up if they are to get into the top-six now.
Warnock’s first match in charge saw QPR draw 0-0 with Preston North End, and the club are still looking at managerial targets to take over on a permanent basis.
Paul Lambert and Tim Sherwood have both been touted as potential candidates by The Telegraph, while Warnock has not ruled himself out of the running.