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Message: <blockquote data-quote="HKS-GT2835R" data-source="post: 2355177" data-attributes="member: 2710">..anyone ever tried?If you do a Google search for DIY FCD you'll see tons of schematics.i found a simple diagram, quite clear, IMO.3 Wires coming out of MAPhttp://www.thedodgegarage.com/turbo/map_15.jpginstead of using the HKS FCD, the zener diode 'bleed' the MAP signal to ground when it gets to a certain voltage so in short the ECU never 'sees' the voltage that will trigger boost cut. The diode is going to let the MAP sensor to send the ecu the actual signal until it reaches some level and then flat amount of voltage above that (the amount that ECU sees & triggers boost cut). I expect all map sensor to read on a 0-5V range, so boost cut happens when MAP generates signal equivalent to 5V? how does the FCD works anyway?Having said that, using this type of circuit will take away a very important safeguard, which is the ECU's ability to close the throttle/reduce boost (boost cut) if you go overboard, but the zener mod is the same thing with installing a FCD what?My question is, you're now 'fooling' MAP to let the engine to accept extra boost, but now *since the MAP is blinded* how do you add the appropriate amount of fuel to prevent detonation? correct me.</blockquote>

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