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The purpose of this research is to implement the variable intake manifold on a Formula Student racecar to achieve a lower overall Autocross lap time. A previous version of the linearly adjustable variable intake manifold prototype was able to deliver an improved engine performance in the form of wider range of engine RPM with high torque, but its dimension did not conform to the FSAE regulation. This research focuses on developing a physically compact rotary variable intake system to achieve a favorable characteristic while conforming to the FSAE rules. The engine is expected to perform better than the previous one by comparing the range of engine RPM which produces torque greater than 48.47 N-m, representing 90% of maximum torque or our 2015 car with a conventional intake system. The optimum runner length is determined using the pressure wave tuning method.