GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Page 1 of 2 12 LastLast
Results 1 to 10 of 12
  1. #1

    Default Under drive pulleys

    was thinking of getting the underdrive pulley set...........anyone with experience? what kind of improvement?


    2007 Classic Chevy Z-71 LT 4 door
    5.3 L K&N CAI
    Flowmaster Exhaust
    Jet Power Programmer
    Jet TB Spacer

  2. #2
    Legend
    TRPLXL2's Avatar
    Join Date
    Jan 2009
    Location
    Norwalk, Ohio
    Posts
    3,359
    Blog Entries
    8

    Default

    A guy at work installed an underdrive pulley on his 05' Avalanche, and he said it basically picks up the power lag from the AC compressor when it is engaged. I don't know if this is true or not, but I have heard this on more than one occasion. Hope this helps, if not then just ignore me!
    2004 Chevy Colorado
    LS1 5.7 swap/TBSS rear axle swap

  3. #3
    Sr. Apprentice lvz2ryd's Avatar
    Join Date
    Mar 2009
    Location
    Boise, Idaho
    Posts
    62

    Default

    Iam interested to know as well what they do for power on a 5.3


    2002 Silverado 1500 5.3|
    Black and Machined Devino 16s|
    Maxxis Bighorn 265/75 |
    Bully Dog Triple Dog with SNB Tune
    |
    Airaid CAI |
    Flowtech 2.5 Afterburner
    |
    Tint Covered ARP Clear Tailights|10% tint so u cant see up in my windows!|



  4. #4

    Default

    appreciate your help.......probably won't get..........thanks again.

  5. #5

    Default

    I installed on my 97 Yukon & removed after I purchased new battery. I was constantly having a dead battery & needing jump. 1st jump was needed about 3-4 weeks after install. I didnt notice any difference except low voltage from alternator when stopped.
    Everyday I wake up is a great day! ;-)
    05' Chevy Suburban, 11' Ford Fiesta

  6. #6
    Legend
    TrailLeadr's Avatar
    Join Date
    Jun 2005
    Location
    Coventry, Rhode Island
    Posts
    3,103

    Default

    Quote Originally Posted by ahm1127 View Post
    I installed on my 97 Yukon & removed after I purchased new battery. I was constantly having a dead battery & needing jump. 1st jump was needed about 3-4 weeks after install. I didnt notice any difference except low voltage from alternator when stopped.
    I guess that's one downfall to them. You might recover a little bit of hp, but the cost is that you either need to install a higher output alt to make up the difference or just suffer through with an alt that spins slower than stock, and as such charges lower.
    Patrick
    Rhode Island


  7. #7

    Default

    For the power you get out of them it's nowhere near worth the money. The only time I would ever buy them is for something like a drag car where you are looking to gain even a tenth of a second. But for anything on the street no.
    Also like someone said, the alt will turn slower so it won't charge as much or at all at idle. Causes more problems then it's worth.

  8. #8

    Default

    Quote Originally Posted by kcb37 View Post
    For the power you get out of them it's nowhere near worth the money. The only time I would ever buy them is for something like a drag car where you are looking to gain even a tenth of a second. But for anything on the street no.
    Also like someone said, the alt will turn slower so it won't charge as much or at all at idle. Causes more problems then it's worth.
    On cars ( primarily mustangs, cobras, Z28's, WS6's and goats ) I have seen thm pick up around 4-5 hp to the ground ( standard trasmission ) never knew they had pullies for trucks.

    typical kits have a alt, water pump and crank pully.

    alt pully is really small, may hurt charging system
    waterpump pully is really big, this will cause you to run hotter
    crank pully is smaller and doesnt really affect much that I know of.

    Are these piggy back type pullies or are you replacing your harmonic damper with the same weight smaller pully?
    - Jayson - Phoenix Az. - 2005 Silverado Crew Cab
    Mod List: K&N CAI, Gibson Shorty Headers, Magnaflow High Flow Y Pipe, Maganflow Catback 3" dumped before axel. MSD Wires, Undercover hard top. 20's on 285 50's.

    Up Next: Dynatech Longtubes w/ matching Y, w/ corsa catback. BBK Throttle Body, T/B Spacer, Larger MAF, Bully Dog Power Pup Tuner.

  9. #9

    Default

    Instead of going underdriven...just getting the stock size in a lighter wieght would help ya out. I did this to my Cav. Oh course with a car only making 120hp anything will help it lol

  10. #10
    Newbie
    Join Date
    Apr 2009
    Location
    Bowie, Marland, U.S.
    Posts
    7

    Default

    It's too bad this company called NST doesn't make them for GMs yet, I've heard nothing but good things about their pulley kits from the forums that talked about them


    This guy said his alt actually charged better with the new pulleys:
    http://www.8thcivic.com/forums/549312-post23.html

    Here's some other talk of it:

    http://www.8thcivic.com/forums/engin...kit-diy-4.html

    And of course the link to the company itself:

    http://www.nonstoptuning.com/pageNormallyAspirated.htm

    Sorry to necropost btw, although thankfully it was within the last two weeks of posting, lol

Page 1 of 2 12 LastLast

Similar Threads

  1. Underdrive Pulleys
    By KyleZ71 in forum Chevy Truck Accessories
    Replies: 8
    Last Post: 08-14-2012, 09:54 AM
  2. Underdrive Pulleys
    By Metaluzc in forum Performance & Fuel
    Replies: 2
    Last Post: 05-30-2010, 09:03 AM
  3. Underdrive Pulleys
    By Jarrett in forum GM Powertrain
    Replies: 5
    Last Post: 02-21-2010, 07:40 AM
  4. Underdrive Pulleys
    By Silverado Junkie in forum General Chevy & GM Tech Questions
    Replies: 0
    Last Post: 02-16-2010, 10:54 AM
  5. underdrive pulleys
    By blacksilverado07 in forum Performance & Fuel
    Replies: 3
    Last Post: 11-28-2008, 09:39 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •