V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters

Do underdrive pulleys actually help?

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Old Mar 10, 2005 | 02:11 AM
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chaset05
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Default Do underdrive pulleys actually help?

I was considering a pulley for the crank and the alternator but i was wanting some feed back from someone that had them installed on there v6 stang. Were they hard to install? any info would be appreciated
Old Mar 10, 2005 | 10:38 AM
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Default RE: Do underdrive pulleys actually help?

As long as you get a belt that will fit the new pulleys from the dealer that you bought if from, yes it is an easy install. But if you didn't get a belt you are going to have a bizatch of a time adjusting the factory belt. They help plenty for the price, too.
Old Mar 10, 2005 | 12:24 PM
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Default RE: Do underdrive pulleys actually help?

Mine made a HUGE difference! They not hard to do, but you will have to buy a puller for around 15 bux or rent one fron an auto parts store. The factory belt will not work, you need a shorter belt. Here is a link to buy pulleys for your car and a link to my pulley install. If I can help with any other questions, feel free to ask.[sm=icon_cheers.gif]

http://www.cardomain.com/memberpage/450179/4

http://www.v6mustangstuff.com/engine.htm
Old Mar 10, 2005 | 01:13 PM
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Default RE: Do underdrive pulleys actually help?

alot of the new underdrive kits keep the stock size belt
Old Mar 10, 2005 | 01:30 PM
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Default RE: Do underdrive pulleys actually help?

hotrod i admire your work that you have done to ur engine!! I need to start doing more mods to my pony!!
Old Mar 10, 2005 | 02:44 PM
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Default RE: Do underdrive pulleys actually help?

i purchased my underdrivepullies(2) of them from rpmoutlet.com. They have a dyno proven package of pullies for 199.95 with the belt! The only trouble i had was taking of the sub bolt. That ***t was so tight we had to have a pressure gun take it off at a tire shop down the street! I can feel the power especially the toque win i double-clutch
Old Mar 10, 2005 | 03:17 PM
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Default RE: Do underdrive pulleys actually help?

ORIGINAL: mdvaldosta

alot of the new underdrive kits keep the stock size belt
I only had to install the Underdrive pulley and the belt didn't even come close, even with my adjustment all the way out, it was still too big. Maybe if your replacing the other accessory pulleys to larger sizes it wiil let you still use the stock belt. [sm=smiley24.gif]

Big difference
Old Mar 11, 2005 | 03:41 AM
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Default RE: Do underdrive pulleys actually help?

HotRods_n_Booze after you change the pulley's thats it you dont have to set the timing or anything like that?
Old Mar 11, 2005 | 03:56 AM
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Default RE: Do underdrive pulleys actually help?

Pulleys or air induction now?.....and how much more power u notice? See i just bought air intake...and thinkn bout pulleys but how much it help[sm=feedback.gif]
Old Mar 11, 2005 | 02:53 PM
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Default RE: Do underdrive pulleys actually help?

ORIGINAL: 2kConvMustang

HotRods_n_Booze after you change the pulley's thats it you dont have to set the timing or anything like that?
It doesn't effect your timing and you don't have to do anything dif.


ORIGINAL: 2kstang

Pulleys or air induction now?.....and how much more power u notice? See i just bought air intake...and thinkn bout pulleys but how much it help[sm=feedback.gif]
An UD Pulley makes a big dif on a six because of how doggy they are stock. Air induction sounds deep and throaty but doesn't do much as far as HP's that you can feel. You can just buy a K&N replacement filter for your stock air box on the 99+ V6's and get the same HP's in my opinion.....I could be wrong, but I did that on mine before I bought my MAC CAI.



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