Lap time simulator (LTS) is a simulation tool used by racing teams to estimate lap time for a given vehicle setup, such as in Formula 1, Indy and Le Mans. This work employs a Formula SAE (FSAE) oriented LTS called OptimumLap, which uses a quasi-steady state method, to simulate prototype cars from Centro Universitário FEI. A MATLAB code has been created to simulate acceleration race and compare this result to OptimumLap. The latter has also been used to simulate skid pad and autocross events. RS8 simulation results have been compared to Michigan 2014 FSAE competition elapsed times for model validation. After validation of RS8 model, the new prototype RS9 was simulated in order to predict its performance; finally the results and the behavior of these two vehicles were compared.