In the past, fuel savers would not work when applied to fuel injection because those systems are actually designed to prevent efficient combustion. Adding an HHO kit to your engine’s air-intake increases the combustion efficiency. In order to get the most MPG gains from the HHO kit, the oxygen sensor’s voltage needs to be externally regulated. This is because the vehicle’s factory computer does not know how to deal with the addition of HHO / Brown’s gas in the air intake system.

Increasing the combustion efficiency of an engine increases the exhaust oxygen percentage. Most fuel injection engines use an oxygen sensor to infer the air/fuel ratio of the engine, the increased oxygen content in the exhaust is ‘read’ by the computer to be a lean mixture in the engine. The computer then adds extra fuel to bring the pollution back to ‘normal’.

This problem led to the development of the Electronic Fuel Injection Enhancer (EFIE, pronounced Ee-Fy). The EFIE allows you to apply an offset to the voltage coming from the oxygen sensor, so your vehicle’s computer is completely unaware that the oxygen content of the exhaust has increased.

Only the O2 sensors in front of the catalytic converter should need the EFIE device as the ones behind the catalytic converter are there to make sure the one’s in front are doing their job.

More about HHO: The H2 and O being pumped into the system will react with themselves and then the additional oxygen being pumped in will react with the gasoline. However, since the H2 and O combust more efficiently, it will also increase the efficiency of the gasoline being burned resulting in more oxygen exiting your cylinder and thus making your catalytic converter work less.

How EFIE’s work:

The oxygen sensor “tells” the computer what the oxygen content is by providing a voltage on it’s signal wire between 0 and 1 volt. 450 millivolts (.45 volts) means that the fuel/air mixture is correct. Higher values means the mix is rich (has too much gas), and lower voltages means the mix is lean. By adding voltage to the sensor’s output, we can compensate for the additional oxygen in the exhaust.

The Electronic Fuel Injection Enhancer (EFIE) does exactly this. It adds a floating voltage to the top of whatever the oxygen sensor is putting out. It has an adjustment that allows you to control, to within a few millivolts, the amount of this added voltage. This allows the computer to be unaware of the additional oxygen content of the exhaust from the HHO generator, and the electrolyzer can now achieve it’s full potential in fuel savings.

Most cars have oxygen sensors both before and after the catalytic converter. The ones downstream from the converter do not need to be treated. Their data is used to determine when the converter has gone bad, but are not used in the air/fuel calculations. EFIEs are only needed for all upstream oxygen sensors.

Where to Purchase

There are kits/instructions available from sites that will tell you how to make your own EFIE, but if you don’t have time or the skill to make one there are stores that sell already build EFIEs. If you have purchased an HHO kit or are considering it for a fuel injected vehicle, go to EFIE Devices, to get an already assembled EFIE device.

EFIE - 2 O2 sesors - handles 2 Oxygen Sensors EFIE device - Single O2 sensor

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