Hittin fuel cut at 9psi......Why...?

[MazdaDryvr]

Is the FCD a discreet item? Something that the dealer wont see on service trips? Easy to install? I really do hate the damn cutoff.

 

[kwiktsi]

Is the FCD a discreet item? Something that the dealer wont see on service trips? Easy to install? I really do hate the damn cutoff.

Depends on where you mount it, but yes. It only has three wires and a vacuum line- ground, MAF signal (can be tapped down at the ECU or at the MAF) and the vacuum line goes to a boost source- many people just tap their boost gauge line and mount the FCD under the dash somewhere. No one wil ever know it is there .
Joe

 

[igdrasil]

so....whats the technology behind the FCD? what does it actually do in terms of voltages and stuff?

 

[kwiktsi]

so....whats the technology behind the FCD? what does it actually do in terms of voltages and stuff?

It is actually a failry simple device incorporating a boost switch that allows it to cut MAF voltages back while under boost to keep it out of the boost cut range. I was going to make it 100% electronic with throttle and rpm inputs, but that cannot be done in this price range . It cuts about .5 volts under boost.
Joe

 

[MazdaDryvr]

so is the reason for the fuel cut the fact that Mazda used a Protege ECU? I'm just trying to understand why it happens and how your FCD works. One guy on the thread seemed to think that supressing the cutoff isnt wise.