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<blockquote data-quote="audiolife" data-source="post: 3099315" data-attributes="member: 541383"><p>amps are designed to run in the range of 11.5 to 15v generally, however the higher the voltage in this range the cooler it will run. sure an amp will produce more power at 14 v vs 12.5 but for you to notice the difference sound wise you'll probably need a db meter.</p><p></p><p>an alt that can even put out say 300 amps probably wont do 200 amps at idle. in the case here his will do 75 amps at idle and 150 max (is that hot or cold?) he could very well use up all the output at idle unless he should just listen to it loudly when driving 45+ mph. the systems demands arent controled by the engine speed but the power fed to it is. better batteries can be easier to charge and last longer with the charge. a battery has 3 primary functions in most cars. start the car, act like a filter for the alt and to back up the alt. i'll add a fourth being that its also used in key off from listening to music or running hazzard lights while along the road side. some will say batteries and extra batteries are bad and key off listening is bad because it can fry the diodes in an alt IF the batteries are ran down too far. same thing can be done if you remove the battery from a running car. a good electrical system in a car should have both a good alt and battery. dipping below 13v on an alt isnt going to "fry it" its when the drop is so bad and continous that it causes the vehicle to black out that will harm it . to get some high output alts to do better at around idle people put smaller pullies or raise their idle up. raise your idle up it can efftect gasmilage and performance and depending on the alt the added stress from spining more all the time (meaning some manufacturers actually dont recomend it). if you ever go out and cruise or do the parking lot gatherings are you always going to want to have your engine on? if you compete in most street classes you get measured with the engine off (db drag) and in SQ your engine is only on for about 20 seconds checking for noise.</p></blockquote><p></p>
[QUOTE="audiolife, post: 3099315, member: 541383"] amps are designed to run in the range of 11.5 to 15v generally, however the higher the voltage in this range the cooler it will run. sure an amp will produce more power at 14 v vs 12.5 but for you to notice the difference sound wise you'll probably need a db meter. an alt that can even put out say 300 amps probably wont do 200 amps at idle. in the case here his will do 75 amps at idle and 150 max (is that hot or cold?) he could very well use up all the output at idle unless he should just listen to it loudly when driving 45+ mph. the systems demands arent controled by the engine speed but the power fed to it is. better batteries can be easier to charge and last longer with the charge. a battery has 3 primary functions in most cars. start the car, act like a filter for the alt and to back up the alt. i'll add a fourth being that its also used in key off from listening to music or running hazzard lights while along the road side. some will say batteries and extra batteries are bad and key off listening is bad because it can fry the diodes in an alt IF the batteries are ran down too far. same thing can be done if you remove the battery from a running car. a good electrical system in a car should have both a good alt and battery. dipping below 13v on an alt isnt going to "fry it" its when the drop is so bad and continous that it causes the vehicle to black out that will harm it . to get some high output alts to do better at around idle people put smaller pullies or raise their idle up. raise your idle up it can efftect gasmilage and performance and depending on the alt the added stress from spining more all the time (meaning some manufacturers actually dont recomend it). if you ever go out and cruise or do the parking lot gatherings are you always going to want to have your engine on? if you compete in most street classes you get measured with the engine off (db drag) and in SQ your engine is only on for about 20 seconds checking for noise. [/QUOTE]
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