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How big of an alternator do I need for my car?

Old 11-16-2004, 04:18 PM
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I have done another post looking for a 200+ alt but if i dont need one maybe i wont have to pay a ton of money for one... heres what i got

1 Phoenix Gold Ti 1200.1 (1466 watts RMS)
2 Phoenix Gold Zx350 V2 (about 400 watts RMS each)
1 Phoenix Gold 15 Farad Capacitor

but the thing is is that im NOT gonna be booming this all the time... the zx450s are gonna be a quarter gain since thats all I need them at can some1 do the calculations? and figure what i need at idel and at max rpm's?

Im a broke college kid and didnt want to buy a crazy alt if i didnt have to but if i have to, i have to right..
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Old 11-16-2004, 05:22 PM
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Like I said in your other thread.. since most music has a duty cycle of 10-25% generally speaking you need about 1/3 your amps max current consumption...

assuming you were booming all out I cant see those amps pulling much more then 280 amps max... so probably even 100amp alt would surfice for what you need....

Edit: bigger still cant hurt but I dont know if it would be worth it..

[ November 16, 2004, 06:25 PM: Message edited by: Haunz ]
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Old 11-16-2004, 05:47 PM
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Upgrade the ground on your car too,, use a 1/0 Gauge from the negative terminal to the body/frame of the car, which ever is closest.
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Old 11-16-2004, 06:04 PM
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do more than just the ground, upgrading the big 3 works quite well. i dont think 1/0 guage is needed, 4 guage should be enough.
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Old 11-16-2004, 09:34 PM
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I say 140 amp should do you good.
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Old 11-16-2004, 10:35 PM
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very nice...thank you guys... ok i think im gonna go with the CS130 now another thing would be do i use 2 gauge for ground? or 4 gauge...If I use 2 - 1/0 gauge a person was telling me that sicne its sooo big itll actually hold a charge in the wire and draw amps in there... is this true?

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Old 11-16-2004, 10:37 PM
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Originally posted by coulter:
upgrading the big 3 works quite well. [/QB]
sorry just saw this upgrading the big 3? whats the big three?

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Old 11-16-2004, 10:45 PM
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Originally posted by KillerX:
If I use 2 - 1/0 gauge a person was telling me that sicne its sooo big itll actually hold a charge in the wire and draw amps in there... is this true?
No.. [img]graemlins/bs.gif[/img]

4awg for the alt connections is probably enough, 2awg would be better... 0awg is probably overkill... this is one of 'the big 3'.. your battery ground is the 'big one' I think...

I would definatly use 0awg for your amp powerwire.. though...

some installs may benifit from a seperate ground wire from the battery along with your power wire...

[ November 16, 2004, 11:46 PM: Message edited by: Haunz ]
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Old 11-16-2004, 11:11 PM
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ahhhh thanX Haunz for the clairification...
And would this so-called "welding wire" work ok? I jsut dont wanna goto princess auto and say "umm i need weling wire" and they give me Mig wire or something lol

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Old 11-17-2004, 12:35 AM
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Just go into the welding supply store and tell them your application of upgrading the charging system on the car and your looking for 2 or 0 gauge wire..

Upgrading the ground is the biggest improvement you can make of the big 3.

Unless you putting in a stupidly high output alternator the stock wiring should be fine from the alt to the battery. I know both GM and Iasca have the same guidlines for wiregauge / amperage Draw and length.
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