Modified codes have been developed to improve semi-empirical tire modeling using the 2002 and MF6.1.2(2012) versions of the steady-state, pure side-slip Pacejka model. The 2012 version, in its pure form, is not suitable to model unconventional tire characteristics. Analysis is performed by examining improvements to handle the effect of change in camber and pressure on lateral force for pure cornering tests. A split optimization method is developed to model the unconventional camber characteristics. Fitting using this method leads to an overall improvement in the quality of the fit. Additionally, a modification of the 2012 Pacejka model is proposed to enable it to model unconventional pressure effects. This further improves the quality of fit, for both, pressure and camber characteristics. Due to the difficulty in obtaining tire data, this model uses the multi-tire test results obtained from the Formula SAE Tire Testing Consortium (TTC). Similarly, the underlying code of this thesis is obtained from the TTC website. The code is dissected into preprocessing, fitting and post-processing and each section is analyzed in detail in order to obtain the best-fit coefficients. The work done in this research can be used as a platform to dive into advanced topics in empirical and semi-empirical tire modeling.