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Thanks for initiating this tread, as I blindly but one from the group buy myself, simply because it was priced right. Now to comment on part of questionning: My other question is about the potential hazards associated with the charge contained in the capacitors and if somebody could get zapped by this thing if they didn't know what it was. My question is how badly would they get zapped?
A fully charged battery has a voltage of about 13.2V. when it is not under load.
The alternator (with built in diodes) kicks in and off with a somehow regulated voltage of 14.4V. On top of that rough voltage there is plenty of ripples and/or noise.
The capacitors within the stabilyser filtres out part of that crap (charge cycle) and promptly zaps current out upon demand (discharge cycle). It can cycle like that hundred of times per second thus delivering intantaneous peak current.
Although it is used in a relatively low voltage environment, I would discharge the module through a resitor such as ...a light bulb!
Now what it effectively does and why the car maker don't include them relates to another type of issue: even if it helps the throttle response, if it does not translate in better gas mileage under standard test conditions, why care?
P.S.: I am giving voltages numbers out of memory and have not measured them lately, so feel free to correct if needed.
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