Car computer (ECU) MAP / MAF & EFIE analog tuning enhancer
MAP / MAF: Enhanced Optimization MAP / MAF control signal
MAP / MAF voltage signals using any of a vehicle
MAP / MAF-way adjustment, a key switch
EFIE: Regulating automobile air-fuel ratio to achieve the lean burn engine
EFIE voltage enhanced range: 0-420MV (air-fuel ratio adjustment range: 14.7 to 25)
Comprehensive association regulation: Fuel consumption, power, emissions

The EFIE is the only way to bypass the on-board computer

EFIE - Electronic Fuel Injection Enhancment

Is the only way to avoid the on-board computer. 

Why is this necessary? 
Now, with the HHO generator type hydrogen gas ( Brown gas ) into the combustion chamber. When the HHO gas burns it takes its original state again: 
In the exhaust gas is now a very high percentage of oxygen, the O2 sensor judged as an error. 
With an EFIE to inform the on-board computer with now that everything is in order. 
Please note that the best results are achieved when all the sensors are affected, which are: O2 sensors, MAF and MAP, IAT, CTS. 
Most data modules on the market just go to either O2 or MAF / MAP, however, so a no savings. 
Called the oxygen sensor or O2 sensor " reacts " to the increased oxygen content in the exhaust gas with a lower millivolt voltage. The measurement of meaning "to lean ". 

What happens without EFIE? 
The onboard computer would now compensate for the " disproportion " by letting inject more gasoline. 

The result is MORE consumption of petrol! 
To get it to exclude and maintain fuel economy, there are various ways depending on the vehicle, or depending on the oxygen sensor. 

To find the right EFIE you must first find out what your vehicle for an O2 sensor. This can easily find out through a quick phone call to a specialist workshop. 
There are in principle two O2 sensors. The one based on frequency and the other based on millivolts. 
It is now considered the information to be sent from the O2 sensor to your onboard computer to change.