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lights dim after upgradeing to ho alterna


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bigjohnny 
Copper - Posts: 293
Copper spacespace
Joined: September 23, 2008
Location: Ontario, Canada
Posted: March 16, 2009 at 6:57 AM / IP Logged  
I just leafed through this thread and wanted to add a couple of things.
Ive seen suggested that you need 70A of alternator power power 1000W of audio power... Not sure if its true, but my crappy math skills seem to think it sounds about right.
Secondly, how much amperage is your alternator putting out at idle speed? This is a spec that most companies overlook.
Idles speed output is rated at 2400 Alternator RPM. Figure out how big your main flywheel is, and how small your alternator pulley is, then do the math to figure out how fast your alt is turning when your car is at idle. (I dont know the math sorry... if someone else does id love to know)
Contact the company who makes your alt and ask them how many amps the alt is capable of producing at your measured idle speed.
I'd bet that at idle your alt can't produce a high enough output to power everything thats running.
One thing you could try is an "overdrive" pulley on your alt. Its just a smaller pulley so your alt will turn faster, thus putting out more amperage.
shadowm891 
Member - Posts: 23
Member spacespace
Joined: March 11, 2009
Location: Oklahoma, United States
Posted: March 17, 2009 at 6:21 AM / IP Logged  
are they easy to replace these overdriver pulley's ?
shadowm891 
Member - Posts: 23
Member spacespace
Joined: March 11, 2009
Location: Oklahoma, United States
Posted: March 17, 2009 at 6:31 AM / IP Logged  
yea i think i may need to get one i know the one i got on my alt not one since the size of it matches up with my stock alternator's pulley do u know where i can get me one for my alt
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