When designing a complex system such as a sensornet it is not always practical to build and deploy a realistically sized prototype. At the same time many of the interesting behaviours are hard to observe in small scale simulation and many of the current simulators do not scale well. In this paper we use present an efficient but effective simulator which, when combined with modern day large-scale computational capabilities, allow us to measure the impact of tuning an existing protocol and evaluate the necessary tradeoffs.