One antonym word I can think of is "derating". If I say "derate motor for pump X", it can mean "select a motor with lower power output, since the pump doesn't need a more powerful motor".
But what about selecting a more powerful motor? How can I say "I want to ____ the motor for this pump" and mean "up" the motor, "bump up" the motor, "choose-a-stronger" motor?
I am looking for a phrase or single word, that can be used to speak of this concept clearly. For example when explaining the concept to the sales team or to the customer (user of the engineering application).