The full admission quasi-steady efficiency is not fully representative of the out-of-phase flow condition in the turbine, which at each instant in time is more likely to act as in partial admission conditions. At 80% equivalent speed, the ratio between the cycle-averaged and the quasi-steady efficiency deviates only by few percentage points (1.03, 0.85 and 0.92 at 40 Hz, 60 Hz and 80 Hz respectively) while at 50% equivalent speed, an improvement of almost 10 percentage points could be measured. The ratio between the cycle-averaged and the quasi-steady assumption passed from 0.67, 0.70 and 0.82 for the full admission to 0.81, 0.77 and 0.98 for partial admission, at 40 Hz, 60 Hz and 80 Hz respectively. The effects of vane angle on the cycle-averaged efficiency provided different response depending on the pulse flow. In-phase flow showed that at lower frequencies the close vane position (60 and 70 vane angle) is detrimental to the efficiency compared to the fully open position (40 vane angle). The same does not occur in out-of-phase flow where higher efficiency was found for the optimum vane angle (60 vane angle). This agrees with the findings found in the steady-state testing which show a higher efficiency for the optimum vane angle.