Systems and methods for optimizing the performance of a vehicle under normal operating conditions. A vehicle system adjusts one or more vehicle operating parameters in a closed-loop in response to data received from sensors. A portable vehicle communication interface module is selectively attached to the vehicle without inhibiting normal operation of the vehicle. When connected to the vehicle, the vehicle communication interface module records the adjustments made by the vehicle system in closed-loop operation. These recorded values are then used to update calibration information that the vehicle system uses as default values.