I am so tired of reading post or recommendations that "adding a capacitor" will fix your electrical woes. That I am starting this thread to post links to provide proof that capacitors are a waste of money.
link 1 BCAE
You will need to scroll down the right bar to #46 where capacitors are the topic covered but below is some verbage taken from the topic
"The dips in voltage are smaller. If the capacitor does its job, the added voltage (less voltage drop means higher voltage available to the amplifier) would give you more power output, especially with amps with unregulated power supplies. You probably noticed that I said 'supposed_to_do' earlier. This is because there has been some discussion as to whether a capacitor is a help or a hinderence when it comes to keeping the voltage at a higher level than without it. Of course, if you ask someone that's spent more than $100 on a capacitor if it helped, they'll tell you that it has. Why on earth would someone 'fess up' to wasting that much money on 'snake oil'. I've yet to see a capacitor make an audible difference."
Link 2:
Link 3
Link 4
I like link for the best, a person runs his system with four different power supply configurations:
1. No rear batteries, no capacitor
2. No Rear Battery, 1 Capacitor.
3. Both Batteries, No Capacitor
4. Both Batteries, 1 Capacitor
Then lists the SPL output and voltage drop that each configuration produced.
And with that I rest my case, people save your money, if voltage issues are your concern with your 3s, please look into:
1.) The biggest battery you can fit in the stock location
2.) Larger Alternator
3.) "Big 3" wire upgrade
4.) A grounding upgrade kit (like BigTyla's)
I normally would not recommend number four, but I have read on the forums how his kit and probably kit has improved the car's votages.
Alan, if you find this useful please sticky.
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