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fuel cut defencer


88351wtsi
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The FCD was for 83-86 cars. They had a map sensor and the ecu would fuel cut above a certain boost pressure. The FCD was just a resistor that fooled the ecu into thinking the boost was lower. 87-89 cars don't have a map sensor so the FCD does nothing.

 

On 87-89 cars around 20 psi you are outflowing what the mass can read so the signal gets garbled and you get what feels like fuel cut.

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The FCD was for 83-86 cars. They had a map sensor and the ecu would fuel cut above a certain boost pressure. The FCD was just a resistor that fooled the ecu into thinking the boost was lower. 87-89 cars don't have a map sensor so the FCD does nothing.

 

On 87-89 cars around 20 psi you are outflowing what the mass can read so the signal gets garbled and you get what feels like fuel cut.

 

There are FCD's available that clamp the MAF signal to keep it consistent at high rpm/boost/tps. A circuit could be made to do this for the 87+ but a 1g or 2g MAF might be a better option. You can also open up the unmetered air portion of the maf as long as you don't go so far that the output maf frequency at idle is unstable or below 30-70hz if i remember correctly.

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