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Since there are interested members including yourself, I will try to do some highly controlled testing for future posts. There is nobody more skeptical than myself, and I researched this thoroughly before I ever attempted it.
I recently sold the FJ40 I worked 6 years to restore to showroom condition, and this is the ONLY vehicle I have, I cannot afford to blow it up, so yes, I put in the time and the critical thinking to arrive at a correct result.
At first, just for experimental purposes, I built several of those crap mason jar HHO generators, but ultimately decided that they were unsafe.
THEN, there was the problem of ECU compensation. Let me elaborate. If you install an HHO generator, it will, generally speaking, ( depending on it's size, number of plates, density of the solution, etc ), deliver around 6 litres of Hydrogen gas per minute. Hydrogen is one of the most powerful and combustible fuels known to man, and because of that, it increases the efficiency and power of the engine dramatically, it also cleans the engine as time goes by to make it almost like new.
The problem arises when the ECU senses mileage figures that are greater than what was programmed into it by the factory, IE, it thinks the engine is running to lean, so it compensates by enriching the fuel air mixture. Most people are not aware of this, and when they try it, they get good mileage for awhile, then it goes right back to where it was once the ECU compensates. There are crude MAF sensor devices you can plug into the system and screw around with a couple of little knobs forever to try to overcome that, but THAT is a very inelegant solution. The right way to do it is to install a chip that overrides the ECU. There are chip makers out there that specialize in this burgeoning market, you can buy a chip from them for any vehicle made. THIS is the right way to go. The chip will cost from $80.00 to 100.00, and will "fool" the ECU so that it does not compensate your newly found gas savings right back to zero.
I also took the time to source out a company that builds professional quality HHO generators. I was very pleased with the quality, but the instructions were lacking in two vital areas.
1) Adjusting the electrolyte
You have to adjust the density of the solution to the point that you are getting good hydrogen production, but not drawing so many amps that you burn up the circuit. This is done by trial and error. You start with a known circuit capability, ( 30 amps is about right ). Then you start with a very weak solution of DISTILLED water ( important for longevity and cleanliness of the generator ) and KOH ( Potassium Hydroxide, which is your electrolyte ) NOT BAKING SODA!!! Baking soda will make a corrupted mess of the generator, as will tap water. KOH can be bought at places that supply the soap making industry. I bought 8 lbs of it here in Portland for $13.00.
Add KOH to the solution until you get good hydrogen production. You can test this by running a hose from the HHO generator to a jug filled with distilled water ( must use distilled for testing to avoid contamination ). Once you start seeing it bubbling out of the hose at a pretty good rate, like it's boiling, you test how many amps the circuit is drawing. 25-27 is about right, as the amperage draw will increase as it heats up.
2) Wiring the circuit safely IMPORTANT!!!!!
See my wiring diagram. Hydrogen is dangerous and highly explosive. You MUST wire this into the ignition circuit so that the generator is ONLY on when the ENGINE IS RUNNING.
There were a couple of questions regarding the amperage of the circuit. I bought a 40 amp relay because I could not find a 30 amp. I used a 75 amp switch because I could not find a 30 amp. The fuses are 30 amps, so if I overdraw the circuit, the fuses will take care of everything.
