Eight Four Suited vs Ace Two Offsuit

At the flop:
Winning 29.7% of the time
Tied 0% of the time
Losing 70.3% of the time

At the Turn:
Winning 37.88% of the time
Tied 0% of the time
Losing 62.12% of the time

At the River:
Winning 44.48% of the time(16.83% with trips or better)
Tied 0.43% of the time
Losing 55.09% of the time(2.41% with trips or better)