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.

Almost all modern vehicles, employ oxygen sensors to tell the vehicle’s computer if the air/fuel mixture is too rich or too lean. The computer uses the information from the 02 sensor to determine if more or less fuel should be added to the mix in order to maintain the correct proportion. Gas vehicle engines (as opposed to diesel engines) are designed to operate at an air/fuel ratio of 14.7 to 1. When these proportions are being supplied to the engine, a certain amount of oxygen will be detected in the exhaust by the 02 sensor, and this information is fed into the vehicle’s computer. If more oxygen is sensed, the computer thinks the mixture is too lean (not enough fuel), and adds fuel to the mix. Likewise, if less oxygen is sensed, the computer thinks the mixture is too rich (too much fuel) and cuts back on the fuel fed to the engine. There’s a big problem with this scenario as soon as you start adding a workable fuel efficiency device. For any given air/fuel ratio, burned more efficiently, the oxygen content in the exhaust will rise. If you have two or more efficiency devices installed, even more oxygen will be present in the exhaust. The oxygen content rises as the fuel is burned more efficiently for a number of reasons. Chief amongst these are a) less fuel is being used to produce an equivalent amount of horsepower, and b) less oxygen is being consumed to create carbon monoxide in the exhaust. The bottom line is there is more oxygen in the exhaust as the fuel burning efficiency is increased. So, now that we have spent time and money to install a fuel efficiency device or two, and we are getting a more efficient fuel burn, what does the vehicle’s computer do? It dumps gas into the mix in an attempt to get an oxygen reading in the exhaust equal to it’s earlier, inefficient setup. This will then negate the fuel savings of just about any efficiency device, and in some cases will actually cause an increase in fuel consumption, despite having a workable fuel efficiency device.

The Solution

The handling for this situation is simple. The signal coming from the 02 sensor needs to be adjusted to compensate for the increased fuel efficiency being achieved. Basically the added oxygen in the exhaust fools the computer into thinking the mixture is too lean, causing it to (incorrectly) richen the mix. We need to un-fool the computer so it continues to give us the same amount of gas as before. We do this by making it think there is less oxygen in the exhaust than there actually is. The amount of change to the signal has to be easily adjustable to accommodate the different types of efficiency devices that are available. The oxygen sensor produces voltages to communicate the oxygen content to the computer. When the sensor reads below .45 volts, that means it’s lean, and when it reads above .45 volts, it’s saying the mix is rich. If you connect your volt meter to an oxygen sensor signal wire and ground, while the engine is running, you’ll see the voltage is constantly changing, and you’ll probably see voltages in the range of .3 to .7 volts or so. In actual fact, the voltage is changing back and forth from about .1 volt to about 1.0 volts, several times per second. But a hand held meter is not quick enough to show this. The EFIE adds it’s voltage to the sensor’s voltage, which shifts the voltage that the computer receives towards rich. This causes the computer to provide less gas. Many people think we’re trying to fool the computer with an EFIE. That’s actually not accurate. The extra oxygen in the exhaust because of a more complete combustion is what’s fooling the computer. It’s making the computer think the mix is too lean, and it’s compensating by adding gas that is not needed. The EFIE is un-fooling the computer. All we want to do is get it back to giving us a 14.7 to 1 air/fuel ratio again. It should be noted that an oxygen sensor handling device, by itself, is not a fuel efficiency device. It possibly could be used to control the vehicle’s computer, and make the engine burn a little leaner, and this could possibly give a small increase in gas mileage. But this is not what it was designed to do. It was designed to complement, and in some cases make possible, increased gas mileage using other fuel efficiency devices. If you need to purchase an EFIE for your project, you can find them information below. We specialize in accessories for fuel saving devices such as the EFIE and have a number of different models to suit different applications and budgets.

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.

The Electronic Fuel Injector Enhancer (EFIE) is not intended to be a fuel saver by itself. You should install a device that is designed to get more energy out of the same fuel, such as a hydrogen gas electrolyzer, a fuel vapor production unit, or other device that gets more power out of the same fuel by increasing the efficiency of the burn.

Locate the oxygen sensor signal wire

The easy way to do this is to look it up in your Haynes, Clymer or Chilton manual for your car. If you don’t have one of these, there is a service at www.ahdol.com where you can pay a nominal fee, and get your wiring diagrams emailed to you. I have also recently found a resource at www.autozone.com whereby you can get your wiring diagram, and specific service manual information on your sensors. However, the information is not available for all cars and trucks.  Using the wiring diagram data, you can get the wire color of the signal wire, and hopefully gain access to it up in the engine compartment, where it routes to the computer.

If none of these options are available, you’ll need to locate the oxygen senor and then locate the signal wire by testing. The sensor can have 2, 3 or 4 wires, and you have to know which one is the signal wire. If you have 4 wires they will be:

• Heater 12 Volts +
• Heater ground
• Oxygen sensor signal +
• Oxygen sensor signal ground

If you have 2 or 3 wires, then you can have a common ground, or no heater wires etc. The simplest setup is a single wire, which is the signal wire and the sensor get’s it’s ground from the exhaust pipe. You can use the following procedure to narrow down which wire is which:

• Disconnect the wire harness, turn on the ignition and probe for a wire produces 12 volts. This will be the heater circuit.
• Next find the 2 wires that produce exactly 0 volts. These will be the heater ground and the signal ground. The remaining wire should be your signal wire.
• Reconnect the wiring harness, then strip a little insulation from the signal wire and measure it to ground with the engine running. You’ll get voltage readings constantly fluctuating between 0 and 1 volt, if you have the signal wire. Note, that you have to let the engine warm up a bit before you will get these voltages from the sensor.
• Cut this wire at a convenient location for connecting the EFIE. We’ll call the sensor side of this cut the sensor wire, and the other side of the cut, the computer wire.

Note: rarely an oxygen sensor wiring harness will have more than 4 wires. In this case, the sensor is possibly a “wide band” oxygen sensor. The EFIE has been reported to work with 5-wire wide band sensors.

Once you have determined which is the sensor’s signal wire, you want to get it located up close to the computer. If you used a manual, or wiring diagram, you probably have already located the wire at the computer’s wiring harness. If you had to figure out the wires at the sensor itself, then try to find the same wire at the computer’s wiring harness. It should be the same colors, but test it with an ohm meter to be sure. Sometimes they use the same colors for different things. Even if it’s a pain now, it’s worth it to get the signal wire located up by the computer. This makes cutting into it and hooking up the EFIE much easier.

Locate 12 volt power and ground

You need to ensure that you have switched power, not power directly from the battery. You don’t want the EFIE running 100% of the time. It’s not that the unit couldn’t run 100% of the time, it probably could. But it would slowly drain your battery.

Most of the fuel efficiency devices need switched power as well, and you can often piggy back onto them. Note that the EFIE draws negligible power. You can attach it to any circuit. The best choice for a voltage source is a fuel efficiency device, such as a Hydrogen generator. That way the EFIE only activates when the fuel efficiency device is turned on. Note that when power is shut off to the EFIE, or the EFIE’s switch is turned off, the original connection between the oxygen sensor and the computer is re-established. If connecting to your fuel saver’s power is inconvenient or inappropriate, just use any circuit that is accessory key switched. Your electrical diagram can come in handy here, and if you don’t find another device to attach to, you can usually find a spare circuit in the fuse box (you may have to add a fuse). One installer used the oxygen sensor’s heater power for his EFIE’s power, and this is perfectly acceptable.

Ground can be the vehicle body, engine block or ground from another device, including the ground for the oxygen sensor itself. Just make sure that whatever you choose to use for ground has a negligible resistance (less than 10 ohms) when tested against the negative battery terminal of your car.

Mount the EFIE

You can use the mounting ears to screw down the EFIE to a suitable location on the vehicle body or firewall. Some people like to mount the device inside the passenger compartment of the car.The EFIE is not waterproof. If you mount it under the hood, you will have to take care to cover it if you need to steam or spray clean your engine. If this is something you regularly do, you may want to mount the EFIE in the passenger compartment where it will be protected.

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.

The first thing to know is that the device that you built for your car is not meant to produce enough hydrogen to run your car only on hydrogen. To run 100% hydrogen means you have to build a device which is much more difficult to put together and probably more dangerous because at least at the DIY level the technology isn’t there yet.

The unit that you’re going to build works this way. Quite simply, you will be generating HHO gas from water by sending a charge from your battery into the fuel cell which separates the water molecules in the fuel cell into hydrogen and oxygen. This then generates a gas known as HHO or Brown’s gas.

HHO is not only safe and clean but when combined with gasoline in the carburetor will markedly increase your mileage. Of course it depends on how you drive the car and the type of car you own but a 75% increase in gas mileage is not unheard of. You can save thousands and, according to many testimonials from people who have used the system it is not a scam.

All you need is a good guide to build your own DIY hydrogen fuel cell and you will find any number of those online. These will provide you with a step-by-step instruction on how to build a hydrogen cell and install it in your car and, remember we are not talking rocket science here. The method really is very simple and only a very basic knowledge of mechanics is required. Barring that, you could always take it to your mechanic.

The trick is as with anything else, get the best information that you can and make sure that you can get at least some support. Current evidence suggests that Installing a DIY hydrogen fuel cell will not damage your vehicle but it is always good to have access to somebody who knows.

In regards to that, I have checked out quite a few different products out there and the most complete one I’ve found is www.water4gas.com . You might find it worth your while to have a look.

HHO Cost Savings Spread Sheet Calculator (xls)

Many people have seen about a 20% fuel economy gain utilizing the HHO electrolysis generators to boost the amount of combustible gas in the engine; creating a cleaner more more efficient environment for combustion. As an example if you get 20 mpg, a 20% fuel economy increase will save you $250 after driving 7500 miles @ $4 a gallon for gas.

Below are some excerpts and pictures as well as the link for further reading. I tried to highlight the important information:

One person says:

“I spent about $5 on parts, had everything else already laying around my garage.
So far, I’ve achieved about 10% better mileage, and 10% more horsepower. A definite ‘feel it in the seat of the pants’ improvement”

Below are pictures of his setup:

“Generator” bottle. Makes HHO charged water

“Generator” bottle. Makes HHO charged water

“bubbler bottle” that stays in the vehilce filled with the charged water

“bubbler bottle” that stays in the vehilce filled with the charged water

“most people are starting out by making “test cells” in their garage and using a battery charger, spare battery or even drill batteries to try different configurations.”

Is this safe for the vehilce? Another person writes that, “An HHO unit will NOT damage your vehicle. I agree with … some guys are selling a circuit board that you put inline with the O2 sensors as you have to fool them so you dont run leaner. For some reason if you dont fool the sensors it dumps more gasoline into your enjectors. The circuit board seems real easy to install and has variable knob on it you can “fine tune”"

The theory is that the water is charged in a way that the stainless electrodes seperate the Hydrgoen and Oxygen molecules from the water by electrolysis. Because you induce oxygen AND hydrogen this is known as Brown’s Gas. A highly combustible mixture of hydrogen and oxygen.

Why is Brown’s gas a better fuel than pure hydrogen? Here is an opinion:

The environment is experiencing tremendous problems at the moment, and one of the most serious of these is that we are losing our oxygen. The oxygen content of the air is becoming so low that it threatens our very existence in some areas. The normal oxygen content of our air is 21 percent. But in some places it is only a fraction of that! In Tokyo, Japan, for example, the oxygen content of the air has dipped to 6 or 7 percent. If it reaches 5 percent, people will begin to die. Tokyo has even put oxygen disbursement centers on its street corners, so that people can get emergency oxygen if they need it.

Eventually, if something is not done, this low-oxygen situation will affect each and every one of us.

Brown’s gas, created through an electrolytic process, actually may contribute oxygen to the air supply, rather than leaving it the same (as with fuel cells and pure hydrogen), or consuming it (as with fossil fuels). It is for this reason that we feel it will be the future technology of choice for running our vehicles.

It is not currently practical to run your vehicle strictly on Brown’s gas due to the energy required to create the gas. You can still use it to increase range and performance of a combustion engine by utilizing the alternator’s extra capacity to produce the gas. For more information please read here: source