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Old 08-07-2004, 03:09 AM   #1
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Question Underdrive Pulleys

Hey, I am ready to continue in my mods, and am thinking about an underdrive pulley, but I don't know anything about them. I heard that they are a really good way to get the hp to your wheels. I looked around and I am not sure which one to buy. I was also wondering how hard are they to install, and how exactly do they help.
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Old 08-07-2004, 06:01 AM   #2
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not sure exactly how hard they are to install, but I can throw you a link to one of our many sponsors to grab one.

http://www.extremeeffect.com/38Engine.html

Extreme Effects has a good choice of them, plus they have a nice package deal where you can buy a CAI kit plus a pulley in a bundle.
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Old 08-07-2004, 09:26 AM   #3
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They're not extremely hard to install, if you know a little bit about cars. It works by giving less power to the accessories on the car so it can go right to the wheels. Pretty good mod.
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Old 08-08-2004, 11:19 PM   #4
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Cool, so then should I also get an overdrive pulley as well? I also see alot of pulley sets that say things like 25% reduction and stuff like that, those don't apply to this right?
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Old 08-09-2004, 06:12 AM   #5
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Quote:
Originally Posted by Sharpie
Cool, so then should I also get an overdrive pulley as well? I also see alot of pulley sets that say things like 25% reduction and stuff like that, those don't apply to this right?
That's what a underdrive pulley is, it takes away the distance the belt has to go. So 25% away from the pulley(s).
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Old 08-09-2004, 03:04 PM   #6
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Awesome, it makes sense now. Thanks
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Old 08-09-2004, 04:14 PM   #7
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No problem, if you have questions, ask away.
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Old 08-10-2004, 11:28 AM   #8
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I heard if I don't have an overdrive pulley for the alternator, when I get the underdrive pullies, my subs won't run with my headlights... true, or BS?
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Old 08-10-2004, 11:32 AM   #9
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I was wondering the same thing, because I want to put in a better system next month also.
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Old 08-10-2004, 12:09 PM   #10
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Quote:
Originally Posted by jimmy_beaner
I heard if I don't have an overdrive pulley for the alternator, when I get the underdrive pullies, my subs won't run with my headlights... true, or BS?


B.S. The fact is the stock Alternator is a 130 Amp and does pretty good. I wont say it might not dim a bit when you have the stereo cranked up to warp 9+. On the older Mustangs to 93 they had whimpy 80 or 85 amp alternators. That is why they have conversion kits to take our alternators and put them on Fox bodies. You might consider buying a top of the line battery to help out with your sound system
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Old 08-10-2004, 01:22 PM   #11
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that's good to know. My lights dimmed when my subs would hit really hard for awhile, but they had my amp turned up WAY too high. So I turned it down, and yeah, it worked just fine. Does anyone know where I can find some UD pullies cheaper than at EE? $178, and $38 for the pulley, and then who knows how much for the pulley puller.... and yeah. (still a next summer mod in my mind... shift kit first )
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Old 08-11-2004, 07:52 PM   #12
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Quote:
Originally Posted by Danger Dude
On the older Mustangs to 93 they had whimpy 80 or 85 amp alternators. That is why they have conversion kits to take our alternators and put them on Fox bodies. You might consider buying a top of the line battery to help out with your sound system[/color] [/size][/color][/size]
ahh so that explains why my alt can't handle it.. got a link for a trusted conversion kit? My car can't handle headlights/turn signals and radio at idle
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Old 08-11-2004, 07:57 PM   #13
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Quote:
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ahh so that explains why my alt can't handle it.. got a link for a trusted conversion kit? My car can't handle headlights/turn signals and radio at idle
What year is your car? As for a battery, I would recommend an Optima!!
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Old 08-11-2004, 08:18 PM   #14
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Quote:
Originally Posted by 97Stallion
What year is your car? As for a battery, I would recommend an Optima!!
'89..
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Old 08-11-2004, 08:56 PM   #15
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Quote:
Originally Posted by MonteCitan
'89..
I don't where you can find this kit yet, but it sounds as if you really don't need a kit. Here's a link from Brother's performance that explains how to do it.

http://www.brothersperformance.com/t...r-upgrade.html
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Old 08-11-2004, 08:58 PM   #16
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FYI, 3.8 V6 mustangs have the same alternators as 94-95 5.0's. So if can find a cheap alternator from a v6 mustang it'll work out the same, and are usually pretty cheap on ebay. I got mine for 20 bucks.
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DAMN Those are some old *** numbers!!! I need updated ones!!
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Old 08-11-2004, 09:54 PM   #17
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also if you lights are dimming like crazy get a capacitor. measured in farads. .5 farads can handle up to 500 watts, 1 farad up to 1000, 1.5 up to 1500 and so on .. a seriously good investment for you electrical system and takes ALOT of strain off your amp, also amps run between 13-14 volts, you battery can only hit 12 and with 10 feet or wiring you loose alot of punch in the system. i put a capacitor in the system i put in my g/f car,a 400 watt pioneer sub, 400 watt amp and a capacitor, and it SLAMS, she turns the bass all the way down, when i drive it i crank it its a good idea for any serious car stereo.
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