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Underdrive pulley worth it?

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Old 07-10-2009, 09:09 AM
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Default Underdrive pulley worth it?

I've got a few bucks for more mods, and I'm thinking of adding a pulley. My engine is stock (heads, cam, crank etc). Is it worth doing at this point, or should I wait until moving to a serious power adder (FI, h/c)?

Thanks.
Old 07-10-2009, 09:45 AM
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This is asked at least once a week. It's a mod. It's a fairly simple and cheap mod. It's worth doing at anytime. You will not set records doing it but it is just one more mod.
Old 07-10-2009, 09:56 AM
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8rwhp is what we've seen time & time again. I like the mod, it's easy to do & makes good hp for the $$$.
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Old 07-10-2009, 10:04 AM
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I got one because I kept killing alternators shifting at 6800 rpms all the time. Been on the same one for quite a while now with the UD pulley.
Old 07-10-2009, 10:16 AM
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What about if you're running some type of sound system? I've heard to steer clear of a UD if you're running one... is this true?
Old 07-10-2009, 10:26 AM
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Originally Posted by 1badWS6
What about if you're running some type of sound system? I've heard to steer clear of a UD if you're running one... is this true?
Being that you're an A4 you may want to steer clear if you have a big system. I have an M6 and don't have issues.
Old 07-10-2009, 10:28 AM
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I wouldn't do the pulley until you do your cam. It's a small gain and a bit of a pain in the behind. Wait until the pulley has to come off anyway to upgrade it.
Old 07-10-2009, 10:30 AM
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Originally Posted by Jason 98 TA
8rwhp is what we've seen time & time again. I like the mod, it's easy to do & makes good hp for the $$$.
gotta agree. good bang for the buck mod.
Old 07-10-2009, 10:32 AM
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just put one in and I'm happy! makes the engine rev faster and supposibly good for .1 off the 1/4 mile.
Old 07-10-2009, 11:07 AM
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I have a 1600D Hifonics I run with mine. Without the overdrive alternator I was draining the battery. Since I added it no problems but when either my battery or alternator goes I will upgrade them too since I get flicker at night on big bass hits.
Old 07-10-2009, 12:29 PM
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I am only running one kicker ZX750 on my UD and didn't change charging one bit, even when it's cranking and the bass hits. No flickers or anything.
Old 07-10-2009, 12:35 PM
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Which UD pulley is the most popular? Did anyone else notice the motor reving quicker?
Old 07-10-2009, 02:36 PM
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I don't have a HUGE system but I like my **** LOUD! So I might have to research a UD pulley.
Old 07-10-2009, 02:51 PM
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So this is a good mod 2 do? Worth it? and I have a A4 2000 Z28 w/LT's and several other bolt ons. Would this be a good mod to do? I do not have any CRAZY stereo set up.
Old 07-10-2009, 03:18 PM
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yesterday i got a good deal from a sponser on here. powerbond 25% pulley, both belts, and new bolt for $220 shipped. i think its a good deal. cant wait to put it on.
Old 07-10-2009, 03:21 PM
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I have line-sag problems with totally stock pulleys
and alternator, on hot days with the A/C on. If
you are in the southland, you may well too unless
you compensate by overspinning the alternator.
It's a shaft RPM, field current limit bind.
Old 07-10-2009, 05:19 PM
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does a 25% UD pulley reduce engine longevity at all? any other parts it puts additional strain on?
Old 07-10-2009, 09:19 PM
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^^ seems posible
Old 07-11-2009, 01:36 AM
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I have had mine for alittle over two years now with no issue. I did notice a quicker rev..... sometimes my volt gage drops below 12V but never had battery problems. no after market stereo system here but , I do crank my system at gtg's.....do it!!!!!!



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