This study evaluates the drag reduction strategy of suction and blowing on idealize automotive vehicle,Ahmed Body. Optimization approach is adapted in order to analyse the effect of slot location, momentumcoefficient and slot angle on the vehicle which experiencing drag. Despite all the efforts that have been done toreduce the Ahmed body drag using various active flow control system, most of the drag reduction were only lessthan 15%. A 25° Ahmed body with build in co-flow jet is modelled using a CAD software. The flow around theAhmed body is simulated at Reynolds number based on length Re = 4.29 × 10 6 . The governing equation were solveusing an open source software package, which has been validated against experimental data. Pressure Implicit withSplitting of Operator (PISO) algorithm is applied to solve the equation. The outcome of the simulation are variesdepending on the variables. Some show a decrease in drag while there are also that actually increase the drag of thesystem. This are caused by the suction and blowing slots that effect the surrounding air flow whether it is reducingor increasing the wake size downstream of the body. The result shows the momentum coefficient and location ofboth suction and blowing jet played an important role of manipulating the flow around the body and reducing thedrag. The velocity contours indicated that the key to drag reduction is by using 40 m/s jet velocity, placement ofsuction and blowing away from each other.
 
