Water/Meth Injection has been a pretty big hit in the market for direct injection cars such as the Mazdaspeed 3/6 and the Focus ST. So I imagine it will be just as big of a hit for the Fiesta ST. Since fuel is injected directly into the cylinder and doesn't pass over the intake valves first, there is nothing to keep them clean. If all engines were perfect this would not be a problem, but since engines are not perfect, there are oil vapors and carbon that get pushed back into the intake manifold through systems such as EGR (exhaust gas recirculation) and PCV (positive crank case ventilation). These small amounts of oil and carbon have no where to go but back through the motor and this is not a problem on port injected cars because the fuel is being injected on top of the valves and keeps them clean. With no fuel passing over the valves in a direct injection car, there is nothing to stop oil and carbon build up from occurring. Water/Meth Injection can not only keep your valves nice and clean, but it can also provide chemical intercooling and a nice power bump as well when properly tuned for.
That is why I'm bringing this over here to FiestaST.org.
The AEM meth kit features two controllers but the controller that you guys with the ST will be wanting to use is the boost dependent controller. It comes with an on board MAP sensor that will read up to 35psi of boost. The new design features larger turn resistant knobs to easily set accurate start and full activation points with covered status LED and test buttons for added splash resistance. There is a plug integrated into the controller housing for connecting to the redesigned wiring harness's positive-lock connector. The boost depending controller has a molded-in, barbed connector to accept a boost hose and a wiring legend on the back. The new controllers feature an easy to access integrated fuse and molded mounting tabs. Also, AEM’s engineers spent extensive time revamping the controller’s flow control strategy for a more linear flow output delivery. This means that the flow delivery better matches an engine’s need for water/methanol injection, which further optimizes charge air cooling and detonation control.
AEM’s Water/Methanol Injection kit’s wiring harness is terminated with a positive-lock connector on one end and has color-coded wires to ease installation. Both the power and ground wires for the pump are included in the harness which simplifies the wiring process and eliminates any chance of the pump accidentally activating from a short in the system. An additional wire is included for adding an optional on/off solenoid to stop fluid flow when the system is inactive.
The controllers in AEM’s Water Methanol systems include an integrated “Boost Safe” output feature that monitors the entire injection system and triggers a ground signal via an output if it detects a voltage-related error (short, bad connection, broken wire, overheated pump, high or low voltage signal, etc.), allowing users to define their failsafe strategy from something as simple as flashing a warning light to more advanced strategies like pulling boost or ignition, or switching fuel maps on a standalone engine management system. Combined with the integral and highly accurate conductive low-fluid switch in the tank, “Boost Safe” can also put your engine in safe mode before the system runs dry. This exclusive feature is found only on AEM Water/Methanol Injection Systems.
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AEM V2 Water/Methanol Injection Kit Internal MAP w/out Tank - $399.95
AEM V2 Water/Methanol Injection Kit Internal MAP w/ Tank - $