The phrase "put the pedal to the metal" denotes a sense of urgency and a need for speed. There are several synonyms that could be used to convey similar meanings. One could say "step on the gas" or "floor it" to express the idea of accelerating quickly. Alternatively, one could use the phrase "put the hammer down" to indicate a need for rapid progress. Another similar phrase could be "give it all she's got", which suggests pushing something to its limits. Other possibilities might include "go full throttle", "push the envelope" or simply "let's go fast". Regardless of the specific phrasing, these expressions all share a sense of energy and a desire to move quickly towards a goal.