In recent, automobile engineers have paid much attention on the waste heat recovery technologies, one of possible means to improve thermal efficiency of automotive engine. Two superheaters for the heat recovery in V-type gasoline engine is not cost effective. Therefore, finding the optimum position for one superheater is always tricky decision. The superheater"d better be installed as near exhaust manifold as possible for higher effectiveness; however, only half of exhaust mass flow could be utilized for heat recovery. With the fact in mind, the optimum position of one superheater was investigated with simulation models developed using a commercial software (i.e. AMESim). It was found that installing the superheater near the exhaust manifold regardless of utilizing only half of exhaust mass flow, could recover 3.8 kW more energy from the engine exhaust. Based on this result, the optimum layout of an automotive waste heat recovery system was developed and proposed in this paper.