04 Tiburon GT - 4k Memphis Mojo amp - 2 12' Alpine Subs, and have some questions

[Dingyps]

Hey guys, first of all posting my setup then going into some questions to hear your suggestions.

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As you can tell, I need a capacitor lol

I'm wondering what capacitor I should get, I want it to last and I want it to save my alternator

Currently headlights are dimming if I have it too loud and it's about half up without capacitor atm.

Also I need to get a new stereo in general since my right side channels blew. Tested them multiple times and rewired different speakers, the whole shebang.

JVC KD-X320BTS (Factory Refurbished, does not play CDs) Digital media receiver at Crutchfield.com

Thats what I have in mind atm, but honestly no idea if that's the one to get

Click to read more...

 

[germanyt 10+ year member]

Ok first OP, accept that you know nothing about car audio. 2nd, understand that there is no capacitor out there that will benefit you. I dont have time to tell you everything but what you need is either a 2nd battery or a complete electrical overhaul. For all we know you're using 8 awg wire for your amp.

 

[Dingyps]

Yeah i dont know anything, which is why i asked questions lol, i assume you guyd got me

If i do another battery wont i need a better alternator too?

 

[Jes 42 10+ year member]

Yeah i dont know anything, which is why i asked questions lol, i assume you guyd got me
If i do another battery wont i need a better alternator too?

To run that Mojo 4k yes you need an alt upgrade a big rear batt,big 3,good agm up front at least.Stock alt with no battery backup you are asking for trouble.

 

[LosIsATool 5,000+ posts]

You can do a large aftermarket alternator. No big battery needed.

 

[germanyt 10+ year member]

Yeah i dont know anything, which is why i asked questions lol, i assume you guyd got me
If i do another battery wont i need a better alternator too?

All good man. Its not like your local audio shop is gonna explain everything you need. As long as they sell the products they dont care.

Id choose a modest ho alternator from somewhere like db electrical. Maybe 250 amps or so. And 1 aux battery. Look up info on the BIG 3 and ho alternator installs. Find out what AGM batteries are why they are compatible with each other. And stick around here. Youll learn tons.

 

[Jes 42 10+ year member]

You can do a large aftermarket alternator. No big battery needed.

Gonna trust 4k to 1 batt?Those amps are power hogs.I've ran 3.

 

[adulbrich 5,000+ posts]

Maxwell and XS caps are awesome, but pricey.

Anything else is garbage as far as caps go

 

[LosIsATool 5,000+ posts]

Gonna trust 4k to 1 batt?Those amps are power hogs.I've ran 3.

A 300 amp alternator is plenty. Higher voltage equals better efficiency.

 

[Jes 42 10+ year member]

A 300 amp alternator is plenty. Higher voltage equals better efficiency.

I get what you're sayin but i'd still run 1 up front 1 in back.Better safe than sorry.Especially using better equip..

 

[Jeffdachef 5,000+ posts]

A 300 amp alternator is plenty. Higher voltage equals better efficiency.

why do people meter higher with a bigger bank then? The alt is not gonna supply at that all at once. You need instant access reserves

Yeah i dont know anything, which is why i asked questions lol, i assume you guyd got me
If i do another battery wont i need a better alternator too?

You need a better box. That current box is horribly designed. Your amp is not even close to making 4k let alone 2k right now with your stock like electricals. You need a high output alt 270 or higher, big 3 and a good battery under the hood along with one or two batteries in the rear by the amp.

Seeing as you have a 4k amp. You might want some beefier subs that can handle the amp when you actually get full power out of it down the line.

 

[LosIsATool 5,000+ posts]

why do people meter higher with a bigger bank then? The alt is not gonna supply at that all at once. You need instant access reserves


You need a better box. That current box is horribly designed. Your amp is not even close to making 4k let alone 2k right now with your stock like electricals. You need a high output alt 270 or higher, big 3 and a good battery under the hood along with one or two batteries in the rear by the amp.

Seeing as you have a 4k amp. You might want some beefier subs that can handle the amp when you actually get full power out of it down the line.

If you are metering at idle than the bank will support before the alt unless you have enough idle amperage from the start. If you meter at higher current RPM than it will never see the batteries.

People say you need power by the amp. That's BS. Electricity flows very fast. Power flows from the highest point down, not he other way around. Highest point should be the alternator. Batteries do not rest at 14v

 

[wew lad 5,000+ posts]

why do people meter higher with a bigger bank then? The alt is not gonna supply at that all at once. You need instant access reserves

Aw yeah took the words right out of my mouth. Capacitance makes a huge difference, adding my second battery made a noticeable difference in output.

 

[Jeffdachef 5,000+ posts]

If you are metering at idle than the bank will support before the alt unless you have enough idle amperage from the start. If you meter at higher current RPM than it will never see the batteries. People say you need power by the amp. That's BS. Electricity flows very fast. Power flows from the highest point down, not he other way around. Highest point should be the alternator. Batteries do not rest at 14v

this was at 2.5k rpm. The guy's alt gets full power at 1.5k. This was not at idle. It was a clear gain after adding two batts.

 

[wew lad 5,000+ posts]

If you are metering at idle than the bank will support before the alt unless you have enough idle amperage from the start. If you meter at higher current RPM than it will never see the batteries. People say you need power by the amp. That's BS. Electricity flows very fast. Power flows from the highest point down, not he other way around. Highest point should be the alternator. Batteries do not rest at 14v

Yes and no. Mostly no.