Both the Colorado State University (CSU) and Goddard superparameterization GCM (SP-GCM) simulate a superactive Asian summer monsoon with unrealistically enhanced levels of precipitation. The underlying physical mechanism for this monsoon bias in the CSU SP-GCM is shown to involve an enhanced convection-wind-evaporation feedback. The feedback process is studied using two experiments with different fixed specifications of surface evaporation. A regional analysis of an area that exhibits excessive precipitation offers a glimpse of the transient nature of the feedback. Finally, we discuss the broader relevance of the feedback study to climate modeling.