The more recent unsteady turbine performance evaluation was given by Marelli and Capobianco [16], where they have utilized largely similar measurement techniques as in the current study. However, their investigation was focused on single-entry radial turbine under waste gated conditions. In broad perspective, Marelli and Capobianco [16] showed the signature unsteady curves and quantified the turbine efficiency depreciation in comparison to quasi-steady assumptions. This paper addresses the turbine unsteady performance under the combination of twin-entry and variable geometry configurations, which has not been shown previously. The presented experimental data and performance characteristics will serve as an essential validation tools for computation models to address the accurate turbocharger component assessments methods in an engine design process.