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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > AUDIO/VIDEO + BLUETOOTH + Electronics/Alarm/Software > Possible Dual Alternator Kit



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      01-01-2011, 01:09 AM   #1
bmw325i
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Possible Dual Alternator Kit

Hi I've been searching for somebody to make a high output alternator for the e90 now I did find somebody that could build up the stock one to 250 but thats not recommended for a couple of reasons, and also I'd rather not mess with the stock electrical system. So I found someone near daytona beach Florida that could make a dual alternator kit the way it would work is the stock alternator would charge the stock battery and that will power all the factory electricals. The new alternator would charge a second battery which could power your amps, power inverters or whatever else you want. So I am hoping to start a group buy for these we could get them for $300 a kit shipped if 5 people buy. This kit could also be used to replace the factory alternator with any alternator from excess amperage which uses their standard case.

Last edited by bmw325i; 01-08-2011 at 02:29 PM.
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      01-01-2011, 10:30 PM   #2
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Hi I just got an email and the guy said it is possible to add a second alternator it would be $400 for the bracket, pulley, and shipping in the U.S so I was thinking we could get a group buy together. So if you want one let me know, this is the only dual alternator kit available and there are no high output alternators out there.
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      01-02-2011, 11:36 AM   #3
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Are you sure just a single high output alternator would not work? Contact Dom Iraggi, as I'm sure he has one for our application, pending if it would not screw with the stock electricals.

I think his email is dominick@tds.net

I swapped out the stock one in my ranger, which was only like 140 amps at most, with a 260+ Iraggi Alt and was able to push a lot of power with it
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      01-02-2011, 11:47 AM   #4
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Well I already found somebody that could increase the output to 250 amps but that still isn't enough for what I have in mind. And I have no idea if it will cause problems with the stock electrical system.
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      01-02-2011, 12:06 PM   #5
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Quote:
Originally Posted by bmw325i View Post
Well I already found somebody that could increase the output to 250 amps but that still isn't enough for what I have in mind. And I have no idea if it will cause problems with the stock electrical system.
I'm curious to know what you have in mind of doing??
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      01-02-2011, 03:20 PM   #6
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Well I am going to remove the rear seat back and replace it with an 18 inch fi btl in a 4 cubic foot box powered by two PDX m12's, for mids and highs I am going to have 2 PDX f4's, and a PDX f4 for the midbass drivers I am going to put under the seats
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      01-02-2011, 07:30 PM   #7
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Quote:
Originally Posted by bmw325i View Post
Well I am going to remove the rear seat back and replace it with an 18 inch fi btl in a 4 cubic foot box powered by two PDX m12's, for mids and highs I am going to have 2 PDX f4's, and a PDX f4 for the midbass drivers I am going to put under the seats
Right on. I just wired up my car to get ready for an RE 12.1 powering a 12" Fi Q. I refuse to use any other subwoofer other than Fi . Met Scott and spent some time in his factory out here in Vegas. Such a stand up guy.

Are you competing or daily use? If you haven't already purchased the 18" BTL I'd check into a 15" ported rather than an 18 sealed. Might also want to toss more than 2400 RMS at a BTL if you really want to get it moving.. Just my $.02.

Either way, I'm done trolling your thread and good luck with the install

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      01-03-2011, 12:04 AM   #8
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I was never planning to put a btl in a sealed box it would probably destroy that box. But I might end up getting a 15 inch anyways because it will fit a little better. And I am gonna put more than 2400 watts to it my m12's birthsheet says 1345 watts and am sure the new one I am getting will be pretty close to that.
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      01-03-2011, 09:28 AM   #9
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Hi I just got a price of 300 dollars if we get a group buy with 5 people I don't know if anyones interested but add your name to the list if you are.

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      01-03-2011, 10:31 AM   #10
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One factor to consider when buying a Hi Output Alternator, is exactly WHEN it makes the higher ouput amps.

This is one of those cases when bigger is not necessarily better Most alternators don't have any trouble keeping up when car is at highway speeds/higher RPM's.

When you really need the higher output is at idle rpm thru about 2000 rpm - you know, when idling at stop or red lights, in-town driving, slow cruising. That is when you will see a high power stereo system suck the life out of your car & all the lights go dim...

Any reputable alternator mfg. should be able to build an alternator that exhibits hi output at the idle-2000 rpm range & be able to prove their ratings.

I have quite a bit of experience with this on my T/A after adding in a killer stereo system, higher output lighting, cooling fans for transmission/oil coolers, reduction crank pulley, etc. There were a lot of 'hi output' alternators out there, but only a few that rated their output at the low rpm ranges. I ended up with an alternator built on the relatively small GM CS130 case that outputs 210 amps thru 2200 rpm. Couple that with the largest Optima Spiral Cell battery that would fit, upgraded size of battery positive & ground wires (very important), and the proper size caps for the stereo amps - I have never had a problem. And this is a car that does a lot of in town driving & slow crusing at car shows.

Another less expensive option that can help to a point is to add a different size alternator pulley to 'overdrive' the alternator at lower engine rpm's. Different size aftermarket pulleys are quite ez to find for GM & Ford applications, don't know about BMW...

So make sure any hi output alternators you choose raise the output at low rpm range and the mfg. can PROVE their stats
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      01-03-2011, 07:36 PM   #11
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The alternator I am getting is a 350 amp from excessive amperage. I will have a couple of kinetic batteries and that is just to power my sound system. That will be more than enough. And if I have to I can put 2 of my f4s on the stock electrical system but I doubt I will have to do that and caps are worthless a good battery will do a better job.
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      01-03-2011, 10:44 PM   #12
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HO alternators also tend to rob power from the engine to spin the damn thing.
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      01-04-2011, 12:33 AM   #13
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Quote:
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HO alternators also tend to rob power from the engine to spin the damn thing.
That's expected but I don't race my car I mostly just cruise in it so I don't really care about a small loss in performance.
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      01-06-2011, 11:57 AM   #14
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The alternator you are getting how much was it and does it affect the bmw electrical?
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      01-06-2011, 05:48 PM   #15
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Well I am getting a 350 amp alternator from excess amperage it is $630 and no it doesn't affect the stock electrical system with this bracket because you would keep the stock alternator charging the stock electrical system, you just need a second battery and some wiring. Any alternator from excess amperage would work with this bracket as long as it uses their standard case you can get an alternator with less output for alot less.
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      01-07-2011, 10:38 AM   #16
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So this won't work in replacing the stock alternator? I already have a 2nd battery but don't want to run 2 alternators, 1 350amp one would be great
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      01-07-2011, 05:37 PM   #17
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You could possibly be able to use this without using the stock alternator I would have to find out but youd probably be better off using the stock alternator and a 200 amp alternator you definetly wouldnt have any problems with the electrical system or light dimming.
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      01-07-2011, 07:25 PM   #18
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If you could find out If i can replace the stock with this, that would awesome. Will be nice to never have to worry about having enoughs amps to charge both batteries
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      01-08-2011, 02:25 PM   #19
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I just got an answer for your question, yes this bracket could be used without the stock alternator, so are you interested in one?
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      01-08-2011, 02:42 PM   #20
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So I can replace the stock alternator with the 350amp one, and only run 1 alternator? and it doesnt affect the electrical?
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      01-08-2011, 03:04 PM   #21
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Well I cant answer whether or not it will effect the electrical system if you use a high output alternator as a replacement for the stock alternator all I know is you can replace the stock alternator with a 350 amp with this kit. Now if you have two alternators it would be fine because the stock electrical wouldnt be touched.
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      01-08-2011, 09:34 PM   #22
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Quote:
Originally Posted by LinxuS View Post
Are you sure just a single high output alternator would not work? Contact Dom Iraggi, as I'm sure he has one for our application, pending if it would not screw with the stock electricals.

I think his email is dominick@tds.net

I swapped out the stock one in my ranger, which was only like 140 amps at most, with a 260+ Iraggi Alt and was able to push a lot of power with it
I aggree with contacting Dom first. Explain what your plans are, and he'll point you in the right direction.
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