A Study on Effects of Tuning Intake and Exhaust Systems upon Exhaust Noises in a Driving Car of Gasoline Engine

Abstract

The purpose of this study is to identify the characteristics of exhaust noise based on the effects of performance and exhaust emissions discussed in the authors' other papers to confirm the effective working possibility of engine tuning without problems in safety and the environment, and to obtain the basic data of the tuning engine inspection after investigating the tuning distinctions in a driving car of gasoline engine. The driving car with a four-cycle, four-cylinder DOHC, turbo-intercooler, water-cooled gasoline engine operating under five types of non-tuning, and tuning 2-1, 2-2, 2-3 (close) and 2-3 (open) was applied to investigate the effects of tuning engine on the characteristics of exhaust noises as the functions of engine and vehicle speeds by the noise measurement method of driving cars according to Noise and Vibration Control Act. The intake manifold, intake pipe, air filter, exhaust manifold, exhaust pipe and silencer were included in tuning parts for a driving car of gasoline engine. It was found that the measured values of exhaust noise for a driving car of non-tuning and tuning gasoline engines by the noise measurement method of driving cars according to Noise and Vibration Control Act met all the inspection criteria, but the exhaust noise values by tuning were increased.