* Engine capabilities: The actual horsepower and torque of the specific engine (e.g., V6 or various V8 options) determined a natural speed limit.
* Gear ratios: The transmission and differential gear ratios influence the maximum speed achievable at a given engine RPM.
* Governor (electronic or mechanical): Some 1994 Firebirds might have had an electronic speed limiter, while others might have relied on the engine's limitations and the gear ratios. The presence and setting of a governor varied depending on the trim level and options.
Therefore, there's no definitive number. It would vary depending on the specific Firebird's engine and optional equipment. You would likely need to consult the owner's manual for your specific model to find any mention of a speed limiter, though it may not be explicitly stated.