how hard is it to install underdrive pulleys

rdbrown15 · October 6th, 2008, 10:51 PM

hey i was thinking about getting some underdrive pulleys for my 94 v6 and i was wondering how hard would it be to install?
i also dont have much engine experince and i was wondering if i would be able to do it. Thanks

mpboy · October 8th, 2008, 10:31 PM

sure you can man, its not hard at all, iv never messed with a 6er, but you can do it with basic tools, and get your self a haynes/chiltons manuel.. it will walk you through the steps

ItaliStang · October 8th, 2008, 10:37 PM

Mustang Underdrive Pulley Kit Video Installation Instructions at AmericanMuscle.com - Free Shipping!

Install ASP Underdrive Pulley on a 99-02 V6 Mustang

agood1 · October 30th, 2008, 02:21 PM

What do underdrive pulleys do on a non-supercharged engine?

ItaliStang · October 30th, 2008, 02:37 PM

UDP Tech

^^this explains how they work / what it does^^

you actually wouldn't want them on a s/c engine by the way...

fast5liter · November 10th, 2008, 03:55 PM

My advise from personal experience, trust me, don't use the altenator pulley.Unless of course you like begging for a jumpstart everytime you shut your car off.

04mustang232 · November 10th, 2008, 05:14 PM

Originally Posted by agood1

What do underdrive pulleys do on a non-supercharged engine?

underdrive pullies just change the ratio of spins on the crank to spins on the entire system to allow less drag. They do the same thing on a supercharged engine.

Cricket · November 10th, 2008, 08:12 PM

Originally Posted by agood1

What do underdrive pulleys do on a non-supercharged engine?

they actually work on a non-supercharged engine. They aren't good for a supercharged engine.

They free up horsepower already in the engine, on the 3.8 they are easy to install.

on a supercharged motor they make it harder to create boost since the pulleys are smaller.

Cricket · November 10th, 2008, 08:13 PM

Originally Posted by fast5liter

My advise from personal experience, trust me, don't use the altenator pulley.Unless of course you like begging for a jumpstart everytime you shut your car off.

thats why you get an overdrive pulley for your alternator so that you can still create power from the alt, but not affect the hp that the crank pulley frees up.

GreenFaleen · November 10th, 2008, 10:21 PM

they add less rotational mass/weight allowing the engine to more easily spin accessory drives thus giving more power where it counts. Bad side they add vibration which some engines just cant handle (ask FM1R about that).

They are pretty easy install just make sure you have an air ratchet

04mustang232 · November 10th, 2008, 10:43 PM

do they really cause problems with charging?

ByPopularDemand · November 11th, 2008, 12:15 AM

Originally Posted by GreenFaleen

they add less rotational mass/weight allowing the engine to more easily spin accessory drives thus giving more power where it counts. Bad side they add vibration which some engines just cant handle (ask FM1R about that).

They are pretty easy install just make sure you have an air ratchet

And what happens?

Onemanzu · November 11th, 2008, 12:19 AM

Originally Posted by GreenFaleen

Bad side they add vibration which some engines just cant handle (ask FM1R about that).

warped pulley, Chris knows all about them too.

If you have a wrench you will be good. Its like changing a tire though, leave the belt on while breaking the hold on the bolts, once you get a good turn or two out of each bolt remove the belt. then do the opposite when tightening them up at the end.

Onemanzu · November 11th, 2008, 12:19 AM

Originally Posted by 04mustang232

do they really cause problems with charging?

possible. Thats why a 10% OD alternator pulley was invented

Freaki · November 11th, 2008, 10:30 AM

so about what kind of increase in hp/tq are we talking after underdrive pulleys and 10% overdrive pulley on alternator? '00 3.8

AtlanticBlue99 · November 11th, 2008, 10:39 AM

Originally Posted by Onemanzu

warped pulley, Chris knows all about them too.

If you have a wrench you will be good. Its like changing a tire though, leave the belt on while breaking the hold on the bolts, once you get a good turn or two out of each bolt remove the belt. then do the opposite when tightening them up at the end.

true. my motoblue aluminum u/d crank pulley warped in the heat and cracked my harmonic balancer.

Onemanzu · November 11th, 2008, 10:40 AM

It can free up to 10 horsepower at the crank. Your main increases are going to be in fuel usage.

AtlanticBlue99 · November 11th, 2008, 10:40 AM

Originally Posted by Freaki

so about what kind of increase in hp/tq are we talking after underdrive pulleys and 10% overdrive pulley on alternator? '00 3.8

5-10 more hp transferred to the rear wheels

Avaric3 · November 11th, 2008, 10:59 AM

Originally Posted by GreenFaleen

Bad side they add vibration which some engines just cant handle (ask FM1R about that).

not a worry wit our 3.8s. thas only a prob on the 4v motors cuz the oil pump cant handle the added vibrations and can cause them to fail at high rpms

Originally Posted by 04mustang232

do they really cause problems with charging?

not at all, but if you wanna be safe use an overdrive alternator pulley

Originally Posted by Freaki

so about what kind of increase in hp/tq are we talking after underdrive pulleys and 10% overdrive pulley on alternator? '00 3.8

~5rwhp/tq

GreenFaleen · November 11th, 2008, 11:13 AM

Originally Posted by Avaric3

not a worry wit our 3.8s. thas only a prob on the 4v motors cuz the oil pump cant handle the added vibrations and can cause them to fail at high rpms

not at all, but if you wanna be safe use an overdrive alternator pulley

~5rwhp/tq

oh yeah I was just stating in general

October 6th, 2008, 10:51 PM	#1
rdbrown15 Regular 1994 V6 SLOW Join Date: Feb 2008 Posts: 112 iTrader: 0 reviews	how hard is it to install underdrive pulleys hey i was thinking about getting some underdrive pulleys for my 94 v6 and i was wondering how hard would it be to install? i also dont have much engine experince and i was wondering if i would be able to do it. Thanks __________________

November 10th, 2008, 10:21 PM	#10
GreenFaleen MM's Resident Ricer 2006 Scion tC 13.001@113 Join Date: Nov 2006 Location: Raleigh/Lenoir, NC Posts: 9,880 Blog Entries: 2 iTrader: 1 reviews	they add less rotational mass/weight allowing the engine to more easily spin accessory drives thus giving more power where it counts. Bad side they add vibration which some engines just cant handle (ask FM1R about that). They are pretty easy install just make sure you have an air ratchet __________________ Scion Tc Turbo - 9psi 297whp 287wtq 2500lbs :p MM 4 Banger club: Senior Ricer NCMM #9 "Horsepower sells cars, torque wins races." -Carroll Shelby

November 11th, 2008, 10:40 AM	#17
Onemanzu ¡ʇsnq ɹo uʍop ǝpısdn Join Date: Oct 2006 Location: Looking for free hand jobs in poland springs nebraska... silly gooses Posts: 12,551 Blog Entries: 1 iTrader: 0 reviews	It can free up to 10 horsepower at the crank. Your main increases are going to be in fuel usage. __________________ My Foz

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October 30th, 2008, 02:21 PM	#4
agood1 Newbie Join Date: Oct 2008 Posts: 11 iTrader: 0 reviews	What do underdrive pulleys do on a non-supercharged engine?

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fast5liter Newbie 1991 Mustang Lx ? Join Date: Apr 2008 Location: Jackson, Michigan Posts: 23 iTrader: 0 reviews	My advise from personal experience, trust me, don't use the altenator pulley.Unless of course you like begging for a jumpstart everytime you shut your car off.

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