<p>This master’s degree project includes the construction, implementation and the theory of function of the traction control system NTRAC, a traction control system designed to increase performance. A closer functionality study of the more common safety-designed traction control systems has been executed. As a result of this study different techniques in decreasing engine torque has been concluded. NTRAC uses a fuel-cutting method to decrease the torque. The risks and consequences by this, as well as different solutions, are in detail discussed in the report.</p><p>One of the main design purposes with NTRAC was to be able to adapt it easily to different vehicles. To evaluate this ability NTRAC has been implemented into two test vehicles, most different to each other by means of physical measurements. As an outcome of this evaluation, a number of mathematical models have been derived and implemented in numerical MATLAB programs. Two models are explained in the report and are included in MATLABfiles as appendix three and four at the end of the report.</p><p>The first model describes the dependency between the action of decrease in torque and the relative remaining degree of efficiency and the report explains why this does not show a linear dependency. The friction between the tire and the road surface plays a crucial part in the theory behind traction control and the report describes in detail how traditional traction control systems are designed to make compromises, in wheel spin tolerances, and thus not uses the maximum amount of traction. To increase performance traction control systems continuously have to optimise this amount and also minimise its fluctuations. Wheels travel with different speeds when cornering, thus the traction control system has to compensate for this, and the second mathematical model in the report describes this in detail.</p><p>Finally an increase in performance is verified through the usage of NTRAC in the formula car KTHR2. During an international competition in the summer of 05, at Bounthingsthorp proving grounds, Leicestershire, England, under perfect weather conditions, a time-saving of nine percentage where registered at acceleration tests from 0 to 75 meters. </p>