A method for implementing power capping in a velocity cooled (VC) mobile data center (MDC). A management information handling system (IHS) applies a power cap for all power consuming components of the VC MDC based, in part, on the detected velocity of the VC MDC. The detected velocity is compared to an outside air cooling threshold velocity. In response to the detected velocity being below the outside air cooling threshold velocity, a first power cap is selected, based on the detected velocity being below the outside air cooling threshold velocity. In response to the detected velocity being at or above the outside air cooling threshold velocity, a second, higher, power cap is selected, based in part on the detected velocity being at or above the outside air cooling threshold velocity. Power capping is implemented to conserve available onboard power for IT equipment processing, based on availability of ram air cooling.