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EFIE for YOUR HHO Dry Cell Kits and Hydrogen on Demand systems





Fuel Injected Vehicles

Fuel Injection Basics
Fuel injected vehicles use a computer and sensing devices to sense and maintain the correct air/fuel ratio. One of the key sensing devices is the oxygen sensor. Fuel injected vehicles have one or more oxygen sensors installed in the exhaust stream. The computer extrapolates what the air/fuel ratio is based on the amount of oxygen in the exhaust, as reported by the oxygen sensor.

When a Hydrogen on demand device is installed, such as a hydroxy electrolyzer, the petroleum based fuel is burned more completely. One of the results of this is that there is more oxygen (and less unburned hydrocarbons) in the exhaust stream. This is a good thing, and is in fact, what we are trying to achieve. However, the computer will perceive this condition as a "too lean" air/fuel mix. In other words, what is now a desirable condition in the exhaust, will be interpreted as "not enough gas", and the computer will direct the fuel injectors to increase the amount of gas being pumped into the engine.

The result is that the oxygen sensor and computer prevent efficient combustion from occurring!efie circuit  and efie device are needed with hho systems

The Solution
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, 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.

If you are purchasing an HHO generator for a fuel injected vehicle, go to www.fuelsaver-mpg.com .
We at HHO2u want  your Hydrogen on Demand projects to be successful fuel saving devices and are here to help any way we can.

Important Information For HHO Dry Cell Install

There have been quite a few breakthroughs recently at www.fuelsaver-mpg.com, and quite a few more will be coming up soon. The leading experts in HHO and Hydrogen on demand electronics have many new products, and we at hho 2u have learned quite a few new things in recent months.

FuelSaver-MPG Inc. has worked hard for years to create devices and technologly that will make the end users more successful when installing HHO Drycells or other Hydrogen on demand systems.

New HHO electronics Products

Digital EFIEsdigital efie	efie device needed with hho dry cell - Quad electronic fuel injection enhancer


This is the latest technology for handling narrow band oxygen sensors. These devices have proven to be able to control the vehicle's air/fuel ratio much more effectively, and can run leaner than the older style analog devices. We now are recommending digital EFIEs for all narrow band vehicles when installing our hho dry cell systems. You can find out more about these at these links:
All EFIE Devices

Wide Band EFIEs


These have been out for quite a while now, but these products really rock. Actually, to be entirely truthful, it's the wide band oxygen sensors that rock. They are so much more precise that they can control a vehicle's air/fuel ratio very smoothly and precisely. However, this means that when we modify the sensor's signal with our Wide Band EFIE, our control of the modified air/fuel ratio is equally precise. Prior to the release of the Wide Band EFIE, there was no solution for these sensors. Now, these vehicles are the easiest to control of all. These EFIEs work on all wide band oxygen sensors, including the 4-wire type used by Toyota. You can find out more about these EFIEs at Wide Band Oxygen Sensors.

MAF/MAP Enhancers


So far we haven't produced an MAF/MAP enhancer. The main reason is that we didn't wan't to produce something that will cost $50 when a perfectly good device can be built for about $3. We have an article that tells you how to do that at A Simple MAF/MAP Enhancer. However, there are a number of MAFs and MAPs in use today that will not respond to any enhancer made today. The MAP enhancers that you see on ebay, and the simple one I describe in my article, will only work with MAPs or MAFs that work on voltage. However there are quite a high percentage of these devices that signal the computer using a varying frequency. There is no handling available for these types of MAF of MAP sensor. However, we are now in the final prototype stage for a frequency based MAP/MAF Enhancer. It will also work on voltage type sensors, but is designed to be a solution for those that have frequency based units.

OBDII Scanners/Readers


Fuelsavers now have some OBD2 scanners available on their site. These are actually inexpensive Chinese scanners that come with free software, and plug in to the USB port on your computer. They actually work very well. We've tested these on a number of vehicles and they work fine. You can read and clear engine error codes, and also read sensor information in real time. There are 2 versions. One plugs into a USB port, and the other plugs into a serial (RS-232) port. Awesome tool for the low price.
You can find them here:

Which EFIE Do I Need?


Categories -- Accessories>

We at HHO2u will also soon be listing some reservoir tanks, bubblers, hose and other incidentals needed for an HHO install. We'll be offering these items for those folks that have purchased or built a hho cell, but don't have the other items needed to install a complete system. If you need these items separate for now please contact us. For Complete HHO Dry Cell System go to our HHO dry cell pages.

New Hydrogen on Demand Electronics Technology

Downstream Oxygen Sensors


This is a subject that has been rearing it's ugly head more and more over the last few months. We have found that a number of manufacturers are using the downstream oxygen sensors as part of their air/fuel ratio calculations. Manufacturers that have documented this are: Dodge/Chrysler, Jeep and Honda, but this is not intended to be a complete list. The vehicles we have seen where this has been done have been model year 2001 and forward.

We actually don't know how wide spread this practice is. However, once we started treating downstream sensors on models that we knew about, we've now found that many other vehicles that are not documented are also using down stream sensors. Ford "F" Series pickups are known to do this without documenting it, and we're now finding at least some Ford cars are following suit. There are many other vehicles, that while they don't use the rear sensors for air/fuel calculations, they still monitor the health of the upstream sensors, and if they are not both treated can cause mysterious engine trouble lights or cause the upstream sensors to not be used.

Due to this situation Fuel Savers have created the world's first quad EFIE. That is a device that has 4 separate EFIE circuits and will treat 4 oxygen sensors. You can find it here:
Which EFIE Do I Need? Quad Digital EFIE Basic. Categories -- Digital Narrow Band EFIE Fuel Savers designed this so we have a product that we can offer that economically treats all of the vehicle's sensors. It has 2 digital EFIEs for treating 2 upstream sensors and 2 analog EFIEs for treating the downstream sensors. We recommend this for about 90% of the time when people call in to our office looking for a recommendation, with the rest being wide band applications.

Which EFIE Do I Need?