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Old 04-03-2014, 02:41 AM   #98
SQ Junkie
Scooby Newbie
Member#: 386551
Join Date: Apr 2014
Chapter/Region: NWIC
Location: Seattle, WA
2007 Impreza 2.5i


Originally Posted by fuzeion View Post
Capacitors are garbagee
Completely agree!! Caps where a means of a bandaid back in the day. There were cheap compared to a second battery and worked well for the lower power amps of the day. With power demands of today's amps, they are less than worthless.

With the lowering cost of batteries and upgraded alternators, it is silly to run caps. A .5 - 1 farad (most common sized) will not be able to sustain power to any amp over even a short amount of time. Stepping up to a larger 1.5 - 2 farad is even worse because the larger the farad value the longer the cap takes to charge. With reactive music constantly pulling current, the longer the cap takes to charge the less likely it is to regain a full charge or any charge of value at all to the system. Once depleted the cap is nothing more than a power conditioner and an additional load on the car battery and charging system.

A cap is nothing more than a reserve that is filled by the charging system. If the charging system cannot keep up, the cap will not be fully charged and continuously lowering in available amperage.

To put in a simple analogy, you wouldn't put a small half gallon gas tank (cap) in line with your engine (amp) from your original gas tank (battery) because "enough fuel isn't getting to the motor". You'd Upgrade the fuel pump (alternator).

If your lights are dimming, buy a better battery or an upgraded alternator. Always upgrade factory wiring (some call this "big 3")!
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