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For a given altitude and exhaust manifold pressure (which defines the available expansion ratio), the level of turbocompounding is dependent primarily on the component or overall efficiency and the turbine inlet temperature.
Figures 14 and 15 present the effect of turbine inlet temperature (TIT) on PTEG.
Figures 16 and 17 illustrate the effect of TIT on PTEG at overall efficiencies of 0.60 and 0.70 respectively.
At an overall efficiency of 0.70 and a TIT of 1650°F, a PTEG of nearly 32% at 70,000 feet is possible.
A four stroke spark ignition engine with a well insulated exhaust system can yield a TIT well in excess of 1650°F.
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