yeah i'm not sure about the potentiometers either.
I'm not planing on building anything either, I just think when people say that it doesn't work (like me, because you put in more energy, than what you get out), should rethink about it because of results people have.
All those satified customers can't be wrong. (maybe there ECU's recognized that timing A/F mixture can adjusted). I know Honda's do that, when higher octane fuel is used. I'm guessing the H/F/A mixture behaves like higher octane fuel. So that's why some people get good results, some don't.
I decided to look more into it and i realized the advertisements were misleading. benefits are from a changes in combustion properties, not actually using the hydrogen as a fuel...
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