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Transonic Combustion or TSCi™ is a novel combustion process based on the patented concept of injection-ignition of fuel. The process takes advantage of the improved mixing properties of supercritical fuel to achieve high yet controlled rates of heat release and high cycle efficiency. However, there is little science that documents the mixing process, ignition characteristics and combustion behavior of gasoline-like fuels in supercritical conditions, let alone the fluid transport properties. Thus, experimental studies and modeling efforts are necessary to enhance understanding of this combustion process and for effective development of this technology. This paper focuses on the model development and validation efforts for TSCi™ in an optical pressure chamber. An optically accessible pressure chamber was used to study the combustion of an injection-ignited supercritical fuel.