Analyzing the data of the previous tests on the track, we quickly realized that it would be the case to make a test bench study, in the true sense of the term. We began to think about how to build a test system of these components related to the typical cooling systems of karts, starting from the heart: the water pump. Like many things, easy to say, a little less to do… Starting from the evaluation of the type of forces in the field: how much power does the pump absorb? And what type of flow should we measure? Here a little help came to us from the manufacturer who declared a maximum flow rate of about 30 liters / min.