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<blockquote data-quote="Buck" data-source="post: 8749339" data-attributes="member: 591582">I know people who run Brand X and swear by them.&nbsp; I have a very long time customer of mine with two brand x 270&#039;s on a Suburban on a Salt 8k and they put in work.&nbsp; Brand X seems to be as good as some of the better, brands, from everything that I&#039;ve seen from them, so far.Sometimes big alts have crappy idle output, on high revving motors, sometimes they have no output until 1000-1200 rpm.&nbsp; I would personally go with the biggest one.The alt pulley will only be so small if your engine revs up to 6k rpm or more.&nbsp; The alt can only spin so fast, so it has to be geared not to over-spin on the top engine RPM, by the size of the alt pulley vs the crank pulley.&nbsp; I&#039;d get the 390a, and run a decent bank of lithium or something that&#039;s lighter with that small car.&nbsp; While idling, you need something with decent reserve power to make up potentially for low alt output, but I would personally get the biggest alt you can fit, see if you can fit more than one alt even, if at all possible.</blockquote>

[QUOTE="Buck, post: 8749339, member: 591582"] I know people who run Brand X and swear by them. I have a very long time customer of mine with two brand x 270's on a Suburban on a Salt 8k and they put in work. Brand X seems to be as good as some of the better, brands, from everything that I've seen from them, so far. Sometimes big alts have crappy idle output, on high revving motors, sometimes they have no output until 1000-1200 rpm. I would personally go with the biggest one. The alt pulley will only be so small if your engine revs up to 6k rpm or more. The alt can only spin so fast, so it has to be geared not to over-spin on the top engine RPM, by the size of the alt pulley vs the crank pulley. I'd get the 390a, and run a decent bank of lithium or something that's lighter with that small car. While idling, you need something with decent reserve power to make up potentially for low alt output, but I would personally get the biggest alt you can fit, see if you can fit more than one alt even, if at all possible. [/QUOTE]

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