In this work, a model-based design (MBD) approach was adopted for the optimization and implementation of a control algorithm intended for a retrofit kit for installation in vintage cars, aimed at improving system performance. The original control algorithm, previously developed in a different environment (LabVIEW), has been fully reconstructed and optimized within Simulink, using a reverse engineering approach, enhancing the simulation environment, and optimizing the code to improve efficiency and robustness in automatic code generation, specifically tailored for Processor-in-The-loop (PIL). The workflow follows a structured MBD methodology, adopting the V-Shape approach. Initially, a detailed study was conducted on the requirements of the original algorithm and the architecture and behavior of the various subsystems.