rev up

rev up  {v. phr.},  {informal},  {slang}

1. To press down sharply several times on the accelerator of an idling car in order to get maximum acceleration.

The race driver revved up his car by pumping his accelerator.

2. To get oneself ready in order to accomplish a demanding or difficult task.

The boys were getting all revved up for the football game.

See: PSYCHED UP.