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<blockquote data-quote="nuugen" data-source="post: 6010430" data-attributes="member: 565870">Let me shed a little light for you...Some alternators don&#039;t start charging until they are spinning above a certain rpm..I have dealt with this for many years on German cars with Bosch alternators, it is a normal occurence.Let the idle drop too low even with a stock pulley and the alt stops charging... The tire analogy doesn&#039;t translate to the charging system---once the alternator is charging you are not going to lose any &quot;top-end&quot; performance.It is a very simple solution: Either bump your idle up to where it should be or a little higher, or go get the proper pulley(just get the OEM one)..Underdrive pulleys are more suited to cars used at the track--since they spin slower, idle speeds can cause the alt to undercharge, the car can tend to overheat if you have one on the water pump, and one on the ps pump can cause hard steering at idle..Also, 5hp will probably never be seen on a street car with basically no other mods..</blockquote>

[QUOTE="nuugen, post: 6010430, member: 565870"] Let me shed a little light for you...Some alternators don't [I]start[/I] charging until they are spinning above a certain rpm..I have dealt with this for many years on German cars with Bosch alternators, it is a normal occurence.Let the idle drop too low even with a stock pulley and the alt stops charging... The tire analogy doesn't translate to the charging system---once the alternator is charging you are not going to lose any "top-end" performance. It is a very simple solution: Either bump your idle up to where it should be or a little higher, or go get the proper pulley(just get the OEM one).. Underdrive pulleys are more suited to cars used at the track--since they spin slower, idle speeds can cause the alt to undercharge, the car can tend to overheat if you have one on the water pump, and one on the ps pump can cause hard steering at idle..Also, 5hp will probably never be seen on a street car with basically no other mods.. [/QUOTE]

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