Fenergy Zap is a power-up in MySims Racing. Use it to zap the opponents in front of you full of Fenergy, which in turn overloads their engines and slows them down, also preventing them from boosting! Small gears, indicating the car being malfunctioned, will spout out of their cars as well. Speed ahead of them while you can.
This sends out a burst of F-Energy, overloading the engines of opponents ahead of you to temporarily reduce their speed and prevent them from boosting.