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<blockquote data-quote="xluben" data-source="post: 2551855" data-attributes="member: 568852">on my 80 amp alternator it goes below 11.4V during the bassline of young jeezy - thug motivation (about 30 seconds long, but the voltage stops dropping after about 20 seconds).i&#039;d definitely like to keep it about 12V at all times (to not stress the battery).considering your car comes stock with a 130 amp i assume it draws more power, so maybe i could get away with a 150 amp.interesting rule of thumb, seems a bit overly safe, and it doesn&#039;t take into consideration the car&#039;s normal current draw.the rule i read somewhere is:stock alternator divided by 2added to amp&#039;s power divided by 14.4 divided by twoexample:80 / 2 = 40 amps2000 / 14.4 / 2 = 70 amps70 + 40 = 110 ampsbut that seems a bit too risky (assuming car only draws half of the current that the stock alt can put out, and that the amp is 100% efficient and only draws half of that)i guess it&#039;s more for a &quot;daily use&quot; number, ie. the bare minimum.any thoughts on the amp i linked to?local shop quoted me ~$250 and 2-3 weeks turnaround to get my alt rewound to 140 amps (he didn&#039;t suggest going any higher).&nbsp; but i can&#039;t go that long without a car.</blockquote>

[QUOTE="xluben, post: 2551855, member: 568852"] on my 80 amp alternator it goes below 11.4V during the bassline of young jeezy - thug motivation (about 30 seconds long, but the voltage stops dropping after about 20 seconds). i'd definitely like to keep it about 12V at all times (to not stress the battery). considering your car comes stock with a 130 amp i assume it draws more power, so maybe i could get away with a 150 amp. interesting rule of thumb, seems a bit overly safe, and it doesn't take into consideration the car's normal current draw. the rule i read somewhere is: stock alternator divided by 2 added to amp's power divided by 14.4 divided by two example: 80 / 2 = 40 amps 2000 / 14.4 / 2 = 70 amps 70 + 40 = 110 amps but that seems a bit too risky (assuming car only draws half of the current that the stock alt can put out, and that the amp is 100% efficient and only draws half of that) i guess it's more for a "daily use" number, ie. the bare minimum. any thoughts on the amp i linked to? local shop quoted me ~$250 and 2-3 weeks turnaround to get my alt rewound to 140 amps (he didn't suggest going any higher). but i can't go that long without a car. [/QUOTE]

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