An injection molding system for initiating flow of fluid material into multiple gates of a mold cavity during an injection molding cycle, the system comprising: a first selected valve comprising a first fluid flow passage having a first gate to the cavity, a first valve pin driven reciprocally along an axial upstream downstream path of travel through the first flow passage by a first actuator between gate open and gate closed positions, one or more downstream valves (711a, 711b, 711c), each downstream valve comprising a downstream fluid flow passage having a downstream gate to the cavity disposed downstream of the first gate, a downstream valve pin (7112a, 7112b, 7112c) driven reciprocally along an axial upstream downstream path of travel through the downstream fluid flow passage (7115a, 7115b, 7115c) by a downstream actuator (730a, 730b, 730c) between a gate open and a gate closed position, a controller receiving a first signal (708, 795b), indicative of a start of injection that feeds the fluid material to the injection molding system, the controller including a set of instructions that instruct the actuator (730a, 730b, 730c) of the valve associated with the at least one selected downstream gate (785a, 785b, 785c) to open the gate by withdrawing the valve pin (7112a, 7112b, 7112c) from the gate closed position at an instruction time, the instruction time comprising a predetermined open gate target time based on the first signal, wherein the valve associated with the at least one selected downstream gate further includes a position sensor that detects an actual open gate time upon withdrawal of the valve pin from the at least one selected downstream gate (785a, 785b, 785c), the position sensor sending a signal indicative of the actual open gate time to the controller, the controller receiving the signal from the position sensor and including a set of instructions that automatically determines an adjusted instruction time (X') for use on a subsequent injection cycle, wherein the instructions that automatically determines comprises decreasing the time of instruction to the valve pin to open on a subsequent injection cycle by an adjustment time equal to any delay in time between the predetermined open gate target time and the actual open gate time. a first selected valve comprising a first fluid flow passage having a first gate to the cavity, a first valve pin driven reciprocally along an axial upstream downstream path of travel through the first flow passage by a first actuator between gate open and gate closed positions, one or more downstream valves (711a, 711b, 711c), each downstream valve comprising a downstream fluid flow passage having a downstream gate to the cavity disposed downstream of the first gate, a downstream valve pin (7112a, 7112b, 7112c) driven reciprocally along an axial upstream downstream path of travel through the downstream fluid flow passage (7115a, 7115b, 7115c) by a downstream actuator (730a, 730b, 730c) between a gate open and a gate closed position, a controller receiving a first signal (708, 795b), indicative of a start of injection that feeds the fluid material to the injection molding system, the controller including a set of instructions that instruct the actuator (730a, 730b, 730c) of the valve associated with the at least one selected downstream gate (785a, 785b, 785c) to open the gate by withdrawing the valve pin (7112a, 7112b, 7112c) from the gate closed position at an instruction time, the instruction time comprising a predetermined open gate target time based on the first signal, wherein the valve associated with the at least one selected downstream gate further includes a position sensor that detects an actual open gate time upon withdrawal of the valve pin from the at least one selected downstream gate (785a, 785b, 785c), the position sensor sending a signal indicative of the actual open gate time to the controller, the controller receiving the signal from the position sensor and including a set of instructions that automatically determines an adjusted instruction time (X') for use on a subsequent injection cycle, wherein the instructions that automatically determines comprises decreasing the time of instruction to the valve pin to open on a subsequent injection cycle by an adjustment time equal to any delay in time between the predetermined open gate target time and the actual open gate time.