A turbocharger turbine operates under unsteady conditions due to the pulsating nature of the exhaust gases. In consequence, twin-entry turbines are generally designed and used for better energy extraction from the pulsating exhaust gases. Twin-entry turbine allows the pulsation in the exhaust gas to be sustained, by separating the banks of the manifold till it reaches the rotor/nozzle inlet. In doing this, the higher isentropic energy in the pulse can made available for the turbine to be extracted. However, pulsating flow creates unique operating characteristics in a twin-entry turbine, in comparison to a single-entry e this is further amplified with the variable geometry configurations. The staggered pulsation in both the entries, due to sequences in the exhaust valve opening, means the turbine is operating in a combination mode of mostly unequal and partial entry conditions. Thus, there is a need for experimental work to understand the unsteady-state performance of a twin-entry variable geometry turbine in various operating conditions, in comparison to the single-entry and nozzleless unit.