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under drive pullies

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Old Nov 16, 2003 | 07:58 AM
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From: dudley mass
Question under drive pullies

anyone running them? hows the idle with them on?
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Old Nov 16, 2003 | 09:08 AM
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I have heard that the idle is a little less than stock but not enough to hurt. Get them I think they are a good mod for the money.

WeS
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Old Nov 16, 2003 | 01:41 PM
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What do you mean "hows the idle?" Idle quality is not affected. Charge at idle wasn't affected on my car either, but I have my idle set to 950 rpm. ASP recomends 800 rpm for their underdrive crank pulley, and 950 rpm if you use both the crank pulley and the underdrive alternator pulley. I've never heard of anybody having a charging problem, though.
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Old Nov 16, 2003 | 03:54 PM
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I am getting my asp crank pulley installed tomorrow. My car idles at about 600 to 650 rpm warmed up...is that a problem since its about 250rpm lower that recommened?
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Old Nov 16, 2003 | 04:50 PM
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If the idle is too low it will not charge properly while the car is at idle. I am sure they recommend 800rpm for a reason and they did not just randomly throw a number on the table.
I would definately bump up your idle alittle bit if you are going to go with the pullies ...
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Old Nov 16, 2003 | 05:22 PM
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So will ill be having problems with my idle!? I knew I might not charge as well but with this have very noticeable ill affects?
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Old Nov 16, 2003 | 05:25 PM
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The pullies will not change your idle characteristics ... it will lower your alt. output ... which is why we said to raise the idle.
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Old Nov 16, 2003 | 05:40 PM
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I know thats what they re designed to do, but will it be a noticeable charging Problem. Becuase I dont have any tuning products or dynos anywhere near me to change my idle.
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Old Nov 16, 2003 | 08:05 PM
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From: dudley mass
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should i add the underdrive pulley with a stereo system??
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Old Nov 16, 2003 | 08:15 PM
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It shouldn't be much of a problem as long as you don't leave the car idling for too long, and then don't drive it. Once you start driving it, it will return to it's normal (or close) charging.

As far as the underdrive and stereo ... it depends on alot of things. I have a really large stereo system, so I have chosen not to install the underdrive on this car (had it on my last) ... however, if you have a smaller one, or if you get a powercap or some other devices such as that, you should be fine.
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Old Nov 16, 2003 | 08:43 PM
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my needle will go to ther left with everything on and idling in park but goes up as soon as im driving.just have your idle turned up.i had mine upped a little.i havent had any problems.its a worthwhile mod for what it costs.
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