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Fuel consumption and CO₂ emission are important drivers of automotive industry product evolution. In Europe, the manufactures have the compromise to reduce their fleet consumption steadily and, in Brazil, a still voluntary but growing labeling program makes the vehicular energetic efficiency one of the main concerns during the concept phase. Different from the full hybrid technology, where the car can be driven purely by the electric motor, the mild hybrid has been mentioned in literature as cost-effective route to reduce CO₂ emissions through the combination of a highly responsive low power electric motor, which acts supporting the internal combustion engine in special driving situations, with energy recovery and storage system composed of advanced batteries. Therefore the mild hybrid system can be understood as one type of downsizing strategy.

Fuel consumption and CO₂ emission are important drivers of automotive industry product evolution. In Europe, the manufacturers have the compromise to reduce their fleet consumption steadily and, in Brazil, a still voluntary but growing labeling program makes the vehicular energetic efficiency one of the main concerns during the concept phase. Although powertrain efficiency plays a decisive role, also vehicular parameters such as weight, aerodynamic, tires rolling resistance and electrical and mechanical loads have an important influence on fuel consumption and CO₂ emissions. The cost-benefit analysis of the modifications in these parameters needs to be performed in the early project stages, where prototypes are still not available.

The present article shows the influence of the measurement method on a transversal section of exhaust system, downstream of the manifold, the dimensional and the acoustics package simulation. For this task the same system section was instrumented with five different configurations; the values of backpressure were measured on maximum power and used as data for the GTPOWER software to make a virtual simulation of acoustics intensity as a function of engine speed. Therefore it was possible to compare the virtual curves with the real measured values of acoustics intensity. Due to the stream lines influence of the analyzed section, we obtained different values of backpressure and curves of acoustics intensity. Finally, it is shown the measured value of backpressure which has the best correlation with the real measurement and identifies the measurement method with piezo ring as the best configuration.