Hawaii and SDSU won 10 games each.
If we count Hawaii as a road game, BYU is 6-39 on the road vs. 9+ win teams since 1989:
Those wins were
9-5 Utah St in 2013
9-4 SDSU in 2012
9-5 New Mexico in 2007
11-2 TCU in 2006
9-3 Arizona St in 1997
9-4 Wyoming in 1990
Those many losses include:
9-3 #47 Sagarin Air Force in 2000
9-3 #50 Hawaii in 2001
10-4 #65 Tulsa in 2007
9-4 #58 UCF in 2014