anybody upgraded their alternator? - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 09-19-2005, 09:57 PM
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anybody upgraded their alternator?

I wanted to have a better music system on the bimmer, but I'm afraid to overtask the current 80 amp alternator. Has anybody upgraded their alternator here to the 140 amper or any other? or known anybody that has done it?
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#2 (permalink) Old 09-20-2005, 09:56 PM
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Well basically wanted to technically know if I can change from the 80 amp alternator in my 318 to the 140 amper that can be found on the 325 and other 6 cyl cars.
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#3 (permalink) Old 09-20-2005, 10:26 PM
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how about a cap???

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#4 (permalink) Old 09-21-2005, 11:44 AM
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Garage
you could also upgrade the battery.
Get an Optimum red top...

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#5 (permalink) Old 09-21-2005, 06:35 PM
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I got the Optima Yellow top. But just wanted to know if 2 amps could hurt my alternator.
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#6 (permalink) Old 09-21-2005, 10:24 PM
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I'd defininty invest in a cap. There worth it to help save your alt. I don't think 2 amps would harm your alt. unless they're huge. Use the formula of P=VI to approximate how much current you need. P = power (watts), V = voltage, I = current (amps). Using the formula, I'd guess you could run a little over 1000 watts, but that's on the upper level.
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#7 (permalink) Old 09-22-2005, 11:28 AM
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depends on which amps and subs you'll be using

You are going to want to have a capacitor no matter what you do. I have a 140 amp alternator and also a 5 farad hybrid cap from Stinger, I can still see the headlights dim a tiny bit when its really pumping...thats two MB Quart amps, two sets of seperates, and an Alpine type X 12" sub...just for reference purposes. I would get a good capacitor, at least two farad, and just check out the amperage draw once you get everything going.

<img src='http://www.bimmerwerkz.com/forum/uploads/post-19085-1125500838.jpg' border='0' alt='user posted image' />

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System - Calrion ProAudio HU / MB Quart RA 1000 Sub amp, RA 4200 4 ch amp / MB Quart PCE 213 5.25&quot; seperates front / JL Audio VR 6.5&quot; seperates in rear / Stinger SPDH5 Pro-Hybrid 5 farad Capacitor / Alpine Type X 12&quot; DVC Sub in a slot ported box
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#8 (permalink) Old 09-22-2005, 12:15 PM
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Wow.... moving to the audio forum.... since its.... ya know..... audio related....

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