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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 01-08-2013, 03:13 AM
iceman4169 iceman4169 is offline
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Location: San Diego California
 
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Mein Auto: 1999 540i
Cool to run subs on stock battery?

Hey everyone im planning on running 4 12 inch subs in my trunk. Im running 2 1500 watt amps to power this and a very good capacitor. Can the stock battery handle this kind of power? 99 540i
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  #2  
Old 01-08-2013, 09:49 AM
edjack edjack is online now
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Mein Auto: '97 540i 6 speed
All depends on pattern of usage. You'll need to ask your ricer friends what they do. The group 49 battery is rated 8-900 CCAs. Bear in mind, it's the alternator that powers the car when running. It may not be strong enough at stoplights to power the amps.

If you run curbside for any length of time on the stock battery, you may be hurting.

Consider seeing an otologist.
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  #3  
Old 01-08-2013, 10:57 AM
iceman4169 iceman4169 is offline
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No ricer friends here. I just make show cars thought itd be a sick idea for a 540 to be one. Should probably just go big on it. Stronger alternator and optima battery. These cars have lots of sensors though. Possibility of too much power? Btw thank you for your response.
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  #4  
Old 01-08-2013, 11:47 AM
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Stone Roots Stone Roots is offline
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Location: San Diego, CA
 
Join Date: Jun 2010
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Mein Auto: 2003 E39 2009 E60
I did some work for a friend of mine who owns a auto sound store here in North County - so he traded stereo for work. Part of the trade was a JL w713.5 powered by a 1000/1 JL amp. I installed myself since they didnt have time for it - i dont NEED that much sub - but when its turned up its a HUGE draw and all the lights (-minus headlights) pulse to the draw.

So if your going beyond that - you will need to upgrade your alternator - possibly add extra batteries. I might upgrade the alternator in future - but as it is sub is just supplemental at this point - even though it can be a neighborhood waker when turned up...

Last edited by Stone Roots; 01-08-2013 at 11:49 AM.
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  #5  
Old 01-08-2013, 12:13 PM
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mpower997 mpower997 is offline
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Mein Auto: E60 545i6/04 330ci
O.P- try running a red top optima and a large 3+farad cap, should be good.
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  #6  
Old 01-08-2013, 01:08 PM
iceman4169 iceman4169 is offline
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Mein Auto: 1999 540i
Im running a lanzar vcap 50 farad. Possibly good?
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  #7  
Old 01-08-2013, 02:33 PM
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DennisCooper! DennisCooper! is online now
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Hi,

Which actual amplifiers are you running? if they are a 'true' 1500 W RMS each, then you absolutely have to uprate your power capabilities as they'd be drawing MASSIVE amounts of current. If they're '1500W' peak, then if they're a cheap budget brand, it's likely they're giving out perhaps 500-600 W RMS. You'd still need to uprate your power though as you will have other amplifiers for the mid range and treble with their own current requirements. If you have high quality brand amplifiers, then they'll have much more efficient and better internal power supplies and you won't really need to use a capacitor. If you look at competition level installs and excellent amateur level ones using high quality products, hardly any use a capacitor.

You need to plan your install carefully if you wish to run high RMS power outputs - have you considered all the 'true' power requirements, proper fusing and protection, correct grade wiring and the large amounts of sound deadening material you'll need? that's all on top of needing a very solid and strong enclosure for the subs, planning the rest of the system as well.

Cheers, Dennis!
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  #8  
Old 01-08-2013, 05:06 PM
iceman4169 iceman4169 is offline
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Dennis thank you for your reply, I've worked on show cars for awhile was just wondering about the battery but everything youve said is absolutely correct! Im running interfire. Theyre 1500 but im almost sure thats not the rms being put out thats why i feel its safe. Im going to make the box built to specs of the subs and have the port running through the back seat arm rest. Again thank you very much for your reply Dennis much appreciated and exactly the answer I was looking for. Take care
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  #9  
Old 01-09-2013, 07:23 AM
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AnotherGeezer AnotherGeezer is offline
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Mein Auto: 2003 530i/5
4 12's?

Can you say...overkill?
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  #10  
Old 01-09-2013, 11:09 AM
iceman4169 iceman4169 is offline
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Yea makin it a show car thats the overall goal boss
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  #11  
Old 01-09-2013, 06:10 PM
speedninja speedninja is offline
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Location: Mishawaka Indiana
 
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Mein Auto: 01 525i, 09 328x coupe
buy another battery your stock is not going to survive
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  #12  
Old 01-09-2013, 07:06 PM
iceman4169 iceman4169 is offline
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Mein Auto: 1999 540i
what kind? ive used optima yellow top but someone told me red is better? opinions?
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  #13  
Old 01-09-2013, 10:45 PM
guysimmons89 guysimmons89 is offline
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Location: tennessee
 
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Mein Auto: 2003 BMW 530i
Ya your probably gonna want a separate battery, as well as a new trunk lid and hearing aids.
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  #14  
Old 01-09-2013, 10:47 PM
iceman4169 iceman4169 is offline
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Been there dude trust me. Used to do competitions. But was just wondering how much the stock one on the 540 can handle. Brings me back sometimes id be tuning it in the trunk and i cant see straight things blowing sound into my head lol
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  #15  
Old 01-09-2013, 11:18 PM
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ill540i ill540i is offline
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I had an l7 with alpine m100 amp in my trunk with the stock battery and it lasted for about 5 months

Sent from my MB502 using Bimmer App
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