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The PFC F-CON is a plug-in fuel computer designed to supplement and refine the OE specified fuel curve. The F-CON performs their function by modifying the factory specific injector pulse width based on information obtained from the OE ECU and the absolute pressure transducer included with the F-CON. This information is compiled by the F-CON and the resulting signal can allow for a longer pulse width for factory injectors or it can take advantage of larger injectors to ensure proper air/fuel ratios during high air flow conditions. HKS includes with each appropriate F-CON kit a device known as a Fuel Cut Defencer (FCD). Several types of FCDs are made to raise the fuel cutoff point. This additional component allows the PFC to be effective at boost levels that would normally shut down the factory fuel system. The FCD, except in the case of Toyota's newer engines, should not be used without an F-CON or some type of supplemental fuel system because the FCD will adversely alter fuel delivery without the addition of supplemental systems. The F-CON is installed by simply plugging in the supplied factory quality wiring harness, mounting and plugging the pressure sensor, and plugging the FCD where applicable. The installation of the F-CON provides the owner the opportunity to return the vehicle to stock conditions by simply removing the unit and harness. While the F-CON is preprogrammed with a ROM for each application, there is a built-in adjustability switch accessible from within the F-CON to compensate for alterations to the HKS staged upgrades. Additional tuning for the F-CON can be performed by using the HKS Mixture Controller or the Graphic Control Computer II (GCC II). For more details on the GCC II see the VPC section in this catalog. The GCC II performs the same function on the VPC or the PFC F-CON.
The F-CON V not only adjusts the fuel management system but can also adjust ignition timing and cancel each limiter function that is in the factory computer. It can be used for up to an 8 cylinder sequential injected engine, reading all signals of fuel supply, injection timing, ignition close angle and speed of each cylinder independently, altering data if desired. F-CON V controls the engine fuel and ignition map completely, with no changes to the stock CPU. Speed and rev limiter cut is also read and can be eliminated. The F-CON V can be used as a stand alone unit (no factory computer). The F-CON V uses air flow, pressure, throttle position 1, water pump, intake air temp, speed, and all other cylinder signals of the stock computer. It also uses pressure signals from the HKS Pressure Sensor, and output signals of all other existing HKS components such as the GCC, VPC, etc. By recalculating data from the original map memorized inside, it is possible to control functions more precisely than the stock computer. F-CON V contains a self diagnostic function which can determine errors not only in the F-CON V main unit or each input signal, but also the air flow, pressure, crank angle, throttle, water temp, and intake sensors. F-CON V stores up to 4 different fuel and ignition maps with access through the dip switch on the front panel when adjustment is desired.
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