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All answers having "Put the pedal to the metal" as clue:

3 Character Answers:

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HIE

REV



4 Character Answers:

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RACE

SPED

TORE



5 Character Answers:

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GUNIT

RACED

SPEED



6 Character Answers:

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GOFAST



7 Character Answers:

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FLOORIT

SPEEDUP



8 Character Answers:

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STEPONIT



9 Character Answers:

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FLOOREDIT

LETHERRIP



11 Character Answers:

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GOGREATGUNS

RUNWIDEOPEN

WINGONESWAY



12 Character Answers:

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GOATFULLTILT

STEPONTHEGAS