The goal of this master's thesis is to develop a comprehensive simulation tool for a Formula Student vehicle, aimed at both modeling and validation, with the purpose of enhancing overall performance and accurately estimating powertrain behavior, cooling efficiency, and energy management. Thus, a secondary objective of the thesis is to create a modular simulation framework capable of linking all key subsystems, enabling cross-validation within a single platform. The final outcome includes lap-time estimation as well as electrical and thermal performance accurate simulation. To facilitate this multi-domain integration, the vehicle model is developed using Simscape, a relatively recent MATLAB & Simulink library that allows coupling of mechanical, electrical, and thermal components.