will this cause a problem for alt?

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=107521
Printed Date: May 04, 2024 at 6:36 AM

Topic: will this cause a problem for alt?

Posted By: daburrrninator
Subject: will this cause a problem for alt?
Date Posted: September 17, 2008 at 9:24 PM

I have an 08 Yaris Sedan that I believe comes with a 70a alternator. I want to add a sound system to it, but I really dont want to fry my alternator. I dont want anything excessive but I want to double check first. This is the planned system:

Polk DB6501 6.5" Components in the front doors
Polk DB691 6x9"s in the back
10" Infinity Basslink for the bass

The Polks would be running off of one of these 4 channel amps

MTX TA3404 50rms x 4
Cerwin Vega Xl300.4 70rms x 4
Bazooka BA460 60rms x 4
or depending on $$
Profile AP1040 80rms x 4

The Basslink is 200w RMS

Thats all I have planned, nothing else. I dont blast my music too loud all the time, but I do have times when the favorite song pops up that I crank it up then it goes back down. I'm going for SQ on a budget.

Do you guys think thats too much for my little car? I'd hate to need a new alt. in a couple months. Worst comes to worst, I could run the polks off of the HU but I'd like to hook them up to an amp.

Replies:

Posted By: basketthis69
Date Posted: September 18, 2008 at 12:06 AM

Japanese alternators can usually handle much more abuse than American ones. I had a very small alt on my integra (can't remember exact size) and hooked up 4 ga wire and was pushing alot of power. Never did the big 3 and never upgraded the alt. In your situation I think you will be just fine. You may want to grab it out and have it rebuilt for higher output at some point though, just to be sure!! But, otherwise, if you're just looking for good, clean sound and you aren't going to be looking to wake the neighbors, you shouldn't have any problems. Just don't overdo it... And make sure you have a decent battery that will hold a good charge. posted_image

GL! Hope this helps!!

-------------
Installer for life.

Posted By: reax222
Date Posted: September 18, 2008 at 1:00 AM

Your looking at around 400 watts which will take about 33 amps. I would figure your alt has about 10 amps of head room when all of the accessories are on. I think you will be pushing it.

Posted By: menaztricks
Date Posted: September 18, 2008 at 10:33 AM

Are the 33amps a constant draw? Or does it vary depending on volume? Thats something I've never confirmed though always thought about.

Posted By: i am an idiot
Date Posted: September 18, 2008 at 1:03 PM

I really don't see how the 2 small amps you are planning to use are going to cause you any problems.

Posted By: reax222
Date Posted: September 18, 2008 at 9:35 PM

It will vary with volume, but it's not max if those are RMS numbers you gave.

Posted By: KarTuneMan
Date Posted: September 21, 2008 at 12:05 AM

I agree with idiot......