I have been that told that my 94 RX7 is equiped with and FCD, i Dont understand what that means and how it works and how it effects the performance of the car when incresing boost, can some one please enlighten me on the workings of a FCD and how to go about it if it is restricting in increasing boost and what things to look out for......

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Your car comes stock with a fuel cut. This starves the motor of fuel when you reach that point.

By adding the FCD, it rids the stock cut off point to allow the fuel to continue to flow when you increase boost.