EFIE Fuel Kit - For Fuel Efficiency
Fuel savers do not work with fuel injection engines because they (fuel injection devices) are designed to see that the combustion is such that it suits the engine for which it is made. If you add an HHO kit to the manifold of the engine, this actually increases the combustion efficiency and the fuel injection system sees this as an aberration and advices the vehicle's computer accordingly. So if you do need to fit an HHO kit you need to see that oxygen sensor's voltage in the fuel injection system is regulated. It is only then that the HHO/Brown's gas can be added to the system that takes in air in the vehicle's system.
When the efficiency of combustion is raised in an engine the oxygen percentage in the exhaust also increases. Fuel injection engines have an oxygen sensor that calculates the air/fuel ratio that the engine is using. When additional oxygen is detected, the computer thinks that the mixture has too much air and therefore adjusts the mixture of the engine by adding extra fuel to normalize the exhaust.
So if a HHO kit is added, the fuel injection system actually thinks that the better combustion is an indication of a lean mixture and so increases the fuel to the engine, thus nullifying any effect of the HHO. Engineers found that by modifying the voltage to the oxygen sensor, it could make the sensor insensitive to the increase in oxygen. This development is called the Electronic Fuel Injection Enhancer or EFIE
There are two oxygen sensors in a fuel injection system. One is in front of the catalytic converter and the other behind it. The one behind the converter is only an insurance to check whether the ones in front are doing their job. So the EFIE device is only fitted to the sensor in front of the catalytic converter.
The oxygen sensor indicates the oxygen content by calculating the voltage through its signal wire. A voltage of 450 milivolts will signal that the mixture is correct. If the reading is more than this it means that the mix has too much gas and a lower voltage would indicate a lean mixture. The EFIE adds voltage to the sensor's output and brings it back to the correct level, thus indicating no difference in the oxygen content.
EFIE adds a floating voltage to that indicated by the oxygen sensor and convinces the car computer that things are normal. You can adjust this top up voltage to within a few milivolts and thus send the correct voltage to the car's system. So the computer is unaware of any additional oxygen because of the addition of the HHO kit and the electrolyzer can do what it is meant to do; that is to save fuel.
EFIE kits can be made by you at home and there are websites that will tell you how to do this. If you have purchased your HHO kit the supplier would also advice you on the EFIE kit, if you indicate that your car has a fuel injection system.