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Message: [QUOTE="Charles, post: 58051, member: 103"] At minimum in this case you would need a boost gauge reading manifold pressure and another reading the first stage boost pressure. You could then set the pressure ratios to optimize the compressor efficiency based on your expected flow rates. The next level of tuning would involve pressure readings being taken in the exhaust system before the stock chargers and between them and the turbine of the first stage compressor. This will allow you to dial in the boost:drive ratios for each stage, and for the system as a whole. This will allow you to see areas where one stage can be pushed harder while another can be relaxed a bit with the same manifold pressure being achieved with less total system drive pressure by making use of the sweet spots of turbine flow and shaft speed. The third level of tuning would be to either implement a shaft speed sensor on one or all compressors such that with the collected pressure ratio data the shaft speed data allows you to plot [i]exact[/i] points on the compressor maps and place each stage at its most efficient point with surgical precision. This level can also make use of a simple temperature probe placed in the intake air stream at the manifold to verify the lowest intake air temp for a given boost, substantiating efficiency calculations. Even further still a person could place such a probe behind each stage to further fine tune them while also continuing the balancing act between drive pressure and compressor efficiency. At any point housings, wheels and bearing types can be altered and tested. Depending on practicality, it can be very simple or very complex. The more in-depth you go the less likely that you are wasting anything with improper housings or selected pressure ratios, but the higher the cost of attaining that data and making those changes. For instance, each housing is usually on the order of a few hundred dollars... [/QUOTE]