A mathematical model of the mechanical loss in a turbocharger is needed to accurately evaluate the efficiency of turbochargers. In our previous study, a mechanical loss model was constructed. Then, the sensitivity analysis by the model could reproduce the trend of friction loss. Particularly, as the temperature of the oil film decreased, the value of the friction rapidly increased. In this study, the constructed model was validated by the experiments using a retardation method. Comparison between the model and the experiment shows that the change trend of the experimental values with each parameter was consistent with the values obtained by the model qualitatively but not quantitatively. Then, the parameters of the model such as the eccentricity ratio of the shaft and the floating bushes, the rotating speed ratio of the floating bushes against the shaft, and the temperature of the oil film were regulated, and the difference between the model and the experiment is improved.