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Car Audio Discussion
General Car Audio
Output @ Idle
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<blockquote data-quote="Buck" data-source="post: 8761091" data-attributes="member: 591582"><p>One of the biggest problems I've seen related to idle output is with smaller, higher revving engines, where the alt isn't even on or is barely producing power at idle, like with a 6000 rpm or higher motor.</p><p></p><p>I know my EA alt, with a small pulley, would do like 80 amps at idle ~600ish motor RPM. Would do a solid 300 amps at 1800-2000 motor RPM. Redline for that vehicle was ~5200 rpm or so.</p><p></p><p>I think idle ratings should be relevant to what the vehicle actually idles at from factory. It genuinely seems like a fairly simple thing to calculate; you just have factory motor RPM at idle (full engine warm up idle, not cold idle) with whatever diameter crank pulley, then that turns the ratio'd alt pulley, and that should be the idle rating. IMO, there shouldn't be a industry-standard rotor idle speed; it should be directly relevant to the specific vehicle conditions. </p><p></p><p>The difference between alt output at idle between big push-rod v8's or a diesel's idle and a DOHC i-4 or i-6 idle is going to be quite different, due to the maximum RPM differences. </p><p></p><p>What would you say the max alt rotor speed is, in general? From my understanding, there's generally only so fast an alt rotor can spin before it would damage itself, so if your vehicle has a super high redline, then the idle rotor speed is going to be significantly lower than a vehicle with a lower redline, correct?</p></blockquote><p></p>
[QUOTE="Buck, post: 8761091, member: 591582"] One of the biggest problems I've seen related to idle output is with smaller, higher revving engines, where the alt isn't even on or is barely producing power at idle, like with a 6000 rpm or higher motor. I know my EA alt, with a small pulley, would do like 80 amps at idle ~600ish motor RPM. Would do a solid 300 amps at 1800-2000 motor RPM. Redline for that vehicle was ~5200 rpm or so. I think idle ratings should be relevant to what the vehicle actually idles at from factory. It genuinely seems like a fairly simple thing to calculate; you just have factory motor RPM at idle (full engine warm up idle, not cold idle) with whatever diameter crank pulley, then that turns the ratio'd alt pulley, and that should be the idle rating. IMO, there shouldn't be a industry-standard rotor idle speed; it should be directly relevant to the specific vehicle conditions. The difference between alt output at idle between big push-rod v8's or a diesel's idle and a DOHC i-4 or i-6 idle is going to be quite different, due to the maximum RPM differences. What would you say the max alt rotor speed is, in general? From my understanding, there's generally only so fast an alt rotor can spin before it would damage itself, so if your vehicle has a super high redline, then the idle rotor speed is going to be significantly lower than a vehicle with a lower redline, correct? [/QUOTE]
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