Design Optimization of Cold Air Intake (CAI) System with Valvetronic to Enhance Engine Performance and Efficiency: A Mitsubishi Lancer Evo VIII Study Addressing SDG 9.4 and 12

Abstract:

The car’s performance improves with higher engine combustion efficiency. In this study, the volumetric airflow rate entering the intake manifold was significantly enhanced by replacing the stock air filter in the Cold Air Intake (CAI) system and integrating a valvetronic mechanism. The valvetronic regulates the air volume intake based on the vehicle's speed. The CAI design was evaluated by comparing the volumetric airflow rate per minute obtained from analytical calculation and flow bench prototype testing, considering three conditions: before re-design, after CAI implementation, and after adding the valvetronic. The results demonstrate a substantial performance gain with the valvetronic, achieving 38.35 hp and a maximum torque of 429.13 Nm. The intake system temperature sensor recorded a reduction of up to 3 °C in air temperature before the intercooler. This improvement can drive innovation in the automotive sector and contribute to achieving Sustainable Development Goals (SDGs) 9.4 and 12 by 2030.

• Periodical: Applied Mechanics and Materials (Volume 932)
• Pages: 3-8
• DOI: https://doi.org/10.4028/p-qvjQi0
• Online since: February 2026
• Authors: Immanuel Johanes Aditya, Zener Sukra Lie, Intan Mahardika*
• Keywords: Cold Air Intake, Engine Performance, Intake Efficiency, Valvetronic

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