Eight Three Suited vs Ace Four Offsuit

At the flop:
Winning 27.81% of the time
Tied 0% of the time
Losing 72.19% of the time

At the Turn:
Winning 33.92% of the time
Tied 0% of the time
Losing 66.08% of the time

At the River:
Winning 39.53% of the time(14.77% with trips or better)
Tied 0.47% of the time
Losing 60% of the time(2.78% with trips or better)