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Automotive manufacturers are under pressure to improve the fuel consumption and emissions figures produced by standard drive cycle tests of their vehicles. Drive cycle tests, such as the New European Drive Cycle (NEDC) start with the engine and transmission cold. The fuel consumption is worse for a cold powertrain than when it is at normal operating temperatures and consequently one way of improving both fuel consumption and emissions is by heating the powertrain as quickly as possible. The PITSTOP (Powertrain Integrated Thermal Systems for Thermodynamically Optimised Performance) project brought together several companies to find ways of reducing the powertrain warm up time. Part of the project was to develop a thermal model of the engine that could both simulate the baseline powertrain and predict the potential improvements of alternative thermal management strategies.