Originally Posted by
velorossa22
But really I wonder why they get such better results with less LPM...
The reason the W4G folks appear to have better results, is because they are not telling you the full story. What they are seeing is the mpg gains from leaning out the engine... to the point that it is dangerous for the engine. They don't have enough HHO to counter the O2 sensor mod.
First and foremost, get yourself an Exhaust Gas Temperature gauge or EGT. They can be pricey but will tell you a lot about what is actually going on. Take a set of base line temp readings without any modifications to the vehicle. Then when you start modding you can do it safely without burning up the engine. The actual temps will vary from installation to installation, but should be in the 700-1300 degrees Fahrenheit range depending on how close you have your sensor mounted to the exhaust port, your style of driving... etc...
Some folks will tell you to just use the water temperature gage. Not a good idea, especially if you have any aluminium parts in your engine (like the heads.) By the time the water temp rises you are already in the danger zone. Best to use the EGT for an instantaneous reading.
You are going to find that it takes a lot more HHO than you imagined to get the results you are looking for. You didn't say what size your engine is, but a good rule of thumb is to start with 1 LPM of HHO for every 1 Litre of engine. Even then you may not be producing enough for any true gains. Just make sure that you don't over draw power on the alternator.
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Some days I get the sinking feeling that Orwell was an optimist!