The Electric Motor can be upgraded 5 times. Upgrades are applied by right-clicking an Electric Motor in-world with the item for the upgrade. Each upgrade quadruples its Torque and doubles its maximum Speed. Its Torque is fixed to its tier, but its speed is set via its GUI. However, as its power output increases, its energy efficiency decreases substantially. Also via its GUI, a toggle can be set to choose whether or not the Motor will respond to a Redstone signal, allowing it to be switched on or off.
The Electric Motor generates heat while it is running, and can accept Liquid Nitrogen with which to cool itself. Tier 0 and 1 Electric Motors should operate safely on their own, but Tier 2 and above Motors must be cooled. If an Electric Motor reaches a temperature of 500C, it will explode.