Welcome to the North American Subaru Impreza Owners Club Monday March 30, 2015
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Normally Aspirated Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Thread Tools Display Modes
Old 07-08-2005, 07:21 PM   #1
Scooby Newbie
Member#: 89288
Join Date: Jun 2005
Chapter/Region: RMIC
Location: SLC, UT
2002 Rex

Default Underdrive pulley???

Does anybody know who has an underdrive pulley that has any problems or loves it to death. Because I just bought a Unorthodox Underdrive pulley. And I'm not sure exactly what it would do besides underdrive the voltage. I know their is faq, but I want to know more through other people not just one person.
* Registered users of the site do not see these ads.
josh04 is offline   Reply With Quote
Old 07-08-2005, 07:45 PM   #2
Scooby Newbie
Member#: 79527
Join Date: Jan 2005
Location: Christian's Mecca, CO
2005 2.5RS(I NDTRBO)
Chipped Crystal Gray


It's lighter as well. Might affect idle.
wht052.5 is offline   Reply With Quote
Old 07-09-2005, 04:23 PM   #3
Scooby Specialist
Member#: 66640
Join Date: Jul 2004
Chapter/Region: Tri-State
Location: Rochester, NY
1997 Legacy Outback
Glacier White


None of your accessories will work as well, i.e. your alternator will make fewer amps, your power steering will assist less and your AC will blow less cool. Also, you might want to consider reading this.
Al_Smokemcrack is offline   Reply With Quote
Old 07-09-2005, 04:30 PM   #4
Scooby Specialist
Member#: 5810
Join Date: Apr 2001
Chapter/Region: Tri-State
Location: Easton PA
2001 S366 2.5RS


dont sweat it.
113k on my .1 rs with ZERO probs.. and I have all my pulleys underdriven
albite my windows go up a bit lower but who cares
sidewayz is offline   Reply With Quote
Old 07-10-2005, 01:42 AM   #5
Scooby Newbie
Member#: 53815
Join Date: Jan 2004
Location: michigan rust isour statecolor
2000 impreza 2.5 rs
metallic red


i have a cheap a$$ 'bomz racing' pully. It weighs 1lb. I notice a smoother acceleration, it feels a bit more powerfull. the only down side i see is at night when you pull away from a light the headlights get brighter... thats all i notice.. I just installed a didgtial volt meter and at 700 rpm with the ac going windshild wipers on headlights on and radio on the voltage is 12.7 volts.. so you wont run into an issue with your battery discharging.
cudaeh is offline   Reply With Quote
Old 07-10-2005, 04:01 AM   #6
Scooby Newbie
Member#: 89008
Join Date: Jun 2005
Location: PA
1998 SUBARU 2.5RS


I also have the cheap Bomz pulley and after the amazingly easy install, I do notice a bit more. It also brightens the headlight after moving from a stop. I dont see it as a big deal.I noticed no other negative effect. The ac is still amazing and the power steering hasnt gotten any harder. I am really happy with it. Just wait until you hold the original pulley in one hand and the new in the other. Youll feel the difference.
SLAKKER2282 is offline   Reply With Quote
Old 07-10-2005, 09:31 PM   #7
Scooby Specialist
Member#: 14365
Join Date: Jan 2002
Chapter/Region: RMIC
Location: Lakewood, CO

Just a lighter pulley will give you almost as much performance without screwing up your electrical system at all.
DragonRM is offline   Reply With Quote
Old 07-10-2005, 09:54 PM   #8
Scooby Specialist
Member#: 63855
Join Date: Jun 2004
Chapter/Region: Tri-State
Location: Effort, PA
2004 PSM WRX Stg 2
95 L Project Car


Lightened is better, IMO

Mr Josh $90 shipped

Cobb i think about 125 + shipping
jwan01 is offline   Reply With Quote
Old 07-10-2005, 11:37 PM   #9
Scooby Specialist
Member#: 14365
Join Date: Jan 2002
Chapter/Region: RMIC
Location: Lakewood, CO

can get a full set from Holland Engineering (pro-ecm) for like 149 (not sure on price) from Larry at www.imprezars.com
DragonRM is offline   Reply With Quote
Old 07-11-2005, 01:10 AM   #10
Sic 2.5rs
Scooby Newbie
Member#: 86715
Join Date: May 2005
Location: Northern salt flats AKA MI
2001 GM6 RS


I've got a full set of unorthodox underdrive pulleys. I dropped .2 seconds in the1/4 but the lights do dim at idle. Full set of pulleys weigh 1.4 pounds stock pulleys were more like 7lbs.
Sic 2.5rs is offline   Reply With Quote
Old 07-11-2005, 08:39 AM   #11
Pat L.I.
Scooby Specialist
Member#: 20498
Join Date: Jun 2002
Chapter/Region: NESIC
Location: West Haven CT
2006 WRX TR
Aspen White


i have the GFB lightened and underdriven pulley set. Yes it dims your lights slightly at idle, ac does not work as well unless the car is revving alot.
This doesnt bother me as i rarely use the AC. I liked the gains i got from the set.
Pat L.I. is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Underdrive pulley vs Lightened pulley sc00ter Newbies & FAQs 21 05-20-2008 08:20 PM
Underdrive Pulleys/Lightweight Pulleys UGotBoost? Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 3 10-22-2003 10:32 AM
Underdrive pulleys AND lightened pulleys? jhayzhon Normally Aspirated Powertrain 1 10-10-2001 07:50 AM
('93-'01) Short throw shifter or Underdrive pulley? Opinions needed! Robmat Impreza Forum 11 05-21-2001 12:56 AM
Unorthodox Underdrive Pulley / Belt kits for SVX Boxer4Racing SVX Forum Archive 21 02-18-2001 06:36 PM

All times are GMT -4. The time now is 09:56 AM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.