Eight Four Suited vs Ace Five Offsuit

At the flop:
Winning 27.91% of the time
Tied 0% of the time
Losing 72.09% of the time

At the Turn:
Winning 34.53% of the time
Tied 0% of the time
Losing 65.47% of the time

At the River:
Winning 40.28% of the time(16.21% with trips or better)
Tied 0.5% of the time
Losing 59.22% of the time(2.58% with trips or better)