''I hope so," Khawaja, a childhood batting mate of Warner's, said of the prospects of a world record.
''I think Davey will be thinking 250 first, then 300. But if anyone can do it, it's probably him.
''But at the end of the day we have to see how the game is going. We'll always be team fist. But if anyone can get 150 in not much time it's Davey."
Lefthanders Warner and Khawaja put on 302 for the second wicket - Khawaja hitting 121 - a record for Australia on the Waca, and easily overtaking the previous second wicket record against New Zealand, the 235 of Michael Slater and David Boon at Hobart in 1993.
New Zealand bowling coach Dimitri Mascarehas was disappointed in the bowlers' performance in gruelling conditions against high calibre batting.
''It was a tough day. Doesn't get much tougher than that.
''We weren't where want to be, we know that. But they played some pretty special innings out there."
By Mascarenhas estimation, New Zealand's bowlers were ''pretty poor" for 85 percent of the day. He said New Zealand had not expected significant pace and bounce from the pitch, based on checking recent statistics of matches at the Waca.
''Coming into it pretty much knowing it's going to be a high scoring game."