Underdrive Pulley? Worth it?

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Underdrive Pulley? Worth it?

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Mustang Forums >> Ford Mustang Tech >> 2005 - 2008 Mustangs >> 4.0L V6 Specific >> Drivetrain Performance >> Underdrive Pulley? Worth it?

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Underdrive Pulley? Worth it? - 12/22/2007 5:58:45 AM

xyster

Posts: 367
Joined: 2/20/2007
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Is an underdrive pulley worth it? Does it really deliver NOTICEABLE gains of torque and hp?! I was looking at the price for one and a belt and just was wondering if the money it wanted, actually delivered in return...

Anyone?

*note* Here's a link to the one I was checking out... http://www.stangmods.com/ASP-Underdrive-Pulleys-p/00226-526400.htm

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RE: Underdrive Pulley? Worth it? - 12/22/2007 2:55:08 PM

jrherald420

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From: richmond,ky
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well i think they work but if you ask most people on here theres no bolt on worth the money unless its gears or a power adder(sc/nitrous/turbo). every hp counts no matter how small.

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RE: Underdrive Pulley? Worth it? - 12/23/2007 9:17:53 AM

scrming

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The HP claim is pretty exaggerated... they claim 16HP... in real life dyno shows about 4 to 6 RWHP gain... which is no where near 16 HP... more like 8...

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RE: Underdrive Pulley? Worth it? - 12/23/2007 12:52:20 PM

rmays06

Posts: 2436
Joined: 5/13/2006
From: DBN, MI
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I went with the Alt pulley and it was noticable but not "huge" gains. I liked the set I got from Pauls High Performance cheap too.

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RE: Underdrive Pulley? Worth it? - 12/24/2007 2:19:23 AM

xyster

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Alright sounds about what I expected from it. I am just making a "small" list to save up for during the next new year :P

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RE: Underdrive Pulley? Worth it? - 12/24/2007 7:39:41 AM

rygenstormlocke

Posts: 4813
Joined: 7/4/2005
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I used to run the PHP alt pulley as well. It helped a tad.

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RE: Underdrive Pulley? Worth it? - 12/25/2007 4:04:11 PM

NickSezz

Posts: 1160
Joined: 5/16/2006
From: Nutley NJ
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Any one got their alt pully that they took off? Ill buy it

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RE: Underdrive Pulley? Worth it? - 12/25/2007 5:54:36 PM

mustangman02232

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Joined: 12/22/2004
From: Ludlow, Mass
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it will help a little but if you plan on a blower dont bother

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RE: Underdrive Pulley? Worth it? - 12/26/2007 8:05:05 PM

cefiro80

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quote:

ORIGINAL: mustangman02232

it will help a little but if you plan on a blower dont bother

+1

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RE: Underdrive Pulley? Worth it? - 1/9/2008 6:40:50 PM

ghoztofcasper

Posts: 44
Joined: 7/25/2006
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I too am looking at this Underdrive Pulley. I was curious how hard is the install?

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RE: Underdrive Pulley? Worth it? - 1/9/2008 6:59:46 PM

PFC_Kurtz_John

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Joined: 8/6/2007
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quote:

ORIGINAL: mustangman02232

it will help a little but if you plan on a blower dont bother

Blower as in FI ? And if the FI doesnt touch belts why would it matter ? Yeah Im still kinda a noob to the FI stuff.

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RE: Underdrive Pulley? Worth it? - 1/10/2008 6:01:19 PM

powerband

Posts: 285
Joined: 12/30/2007
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Noob Question:
Is there any negative effect that an underdrive pulley might have on our cars, like durability, reliability, and increased wear and tear?

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Post #: 12

RE: Underdrive Pulley? Worth it? - 1/10/2008 9:09:54 PM

Black GT

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Joined: 3/26/2006
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They'll make your alternator, air conditioner compressor, power steering pump and water pump operate about 25% slower than their original speeds. If you have an aftermarket stereo system that increases the electrical load you might have a problem with the alternator not being able to keep up (more so at idle speeds).

Worst case scenario is UDP failure. It might not be common but it happens: http://www.mustangforums.com/m_4435611/tm.htm

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RE: Underdrive Pulley? Worth it? - 1/14/2008 2:19:47 PM

cefiro80

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Joined: 12/13/2007
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I have used them on two cars. In both instances I have noticed a different. Was it night and day no. However, it was more of a difference is both cases then some mods that cost a lot more.

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Post #: 14