Interesting. I will look forward for your result .
If you look for kangen water (other brand name) you will find video and pdf about its use for green house plant and japanese hospital. Giant healthy plant and quick injury recovery.
For negative ion use, I think you can get more result with radiant circuit as electrolizer.
See if you get boosted power or at least smoother idle by attaching car body to the alkaline water part. If you don't observe it then it is not the same as Joe Cell.
The symptom seems similar with Bob Beck positive disinfectant and negative cell regeneration from silver electrode, although may not be radiating, unlike Joe Cell.
I would prefer the negative electrode stay longer in the water than the positive. Maybe more than 30 second, for negative ion reason. Explanation at zapper and orgone manipulator thread.