This paper proposes an integrated process utilizing
design of experiment to build up explicit response surface
functions to represent the complicate behaviors of duced. Furthermore, the torque of low-speed range can
be considerably increased to a higher value. There is no
definite evidence supports the reduction of polluted
emissions by modifying the intake pipeline. The study
also shows the effect of exhaust pipeline that is not as
significant as that of intake pipeline; however, the method
of DOE still provides useful information for the
improvement to exhaust pipeline effect.