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Thread: asp underdrive pulleys

  1. #1
    Join Date
    Aug 2005
    Location
    houston TX
    Posts
    73
    i was thinking about getting one what do yall think. my buddy put one on his ls1 camaro and picked up some good power.
    03 1500HD 4x4 6.0 on 33"
    K&N intake, Pacesetter LT, 3" true dule orp, Magnaflow, Comp cam 237 242 .603 .609 112, Patriot Gold springs and Ti retainers, stock ported heads, ASP Underdrive pulley, 42# injectors, 160 tstat., 05 E-Fans, Nelson Fan Harnas, tb bybass, MSD wires, NGK tr55, Ported tb, Transgo HD2, yank 3200 conveter, HP tuners, Walbro 255, 4.56s

  2. #2
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    a lot of times you pick up some false knock reading with the under drive pulleys and end up losing power. You'll usually get good results but sometime you don't. Reducing the rotating mass is a step in the right direction. If you have an auto, get a smaller diameter/lighter weight convertor. You don't have many options for lighter flywheels or clutches. You can take a flywheel to a machine shop and have them lighten it but then it's weaker and you must have it rebalanced. The LS1 F-body guys have an aluminum flywheel you can purchase but DAMN they're pricey. Then again, a good quality convertor is going to cost you about $800.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  3. #3
    Join Date
    Apr 2003
    Location
    Mansfield, Texas, USA
    Posts
    2,462
    The $250 is better spent elsewhere. Toward some full length headers, a used cam, etc. You're looking at maybe 10rwhp...
    The superior man is modest in his speech, but exceeds in his actions. - Confucius

    "He who asks of life nothing but the improvement of his own nature, is less liable than anyone else to miss and waste life."- Henri Frederic Amiel

    '01 Chev Z71 LT - '85 BMW 745i TURBO - '88 BMW 750iL - '88 Ford F150 XLT Lariat - '79 MB 240D - '79 MB 280S Euro
    '80 MB 380SE-5.0 Euro - '85 MB 300SD - '87 MB 300SDL - 1990 MB 300SEL - '91 MB 300SE - '91 MB 560SEL

    Let's face it, the red hair... makes 'em wet.


  4. #4
    Join Date
    Nov 2003
    Location
    Edinburg, TX
    Posts
    41
    I have them on both of my trucks and really like them. I baught them used however.
    02 SCSB Sierra with a cup holder
    01 ECSB Sierra my wife's truck
    01 Pontiac Sunfire my beater

  5. #5
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    There's a fluid damper brand listed on Ebay for $115.00. That's cheap enough to toss if it gives you problems. They guy has them listed all the time.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  6. #6
    Join Date
    Jun 2005
    Posts
    210
    I do believe they help a lil probably 10 rwhp. I use to have a set before the Procharger. In some cases I've seen them make truck battery die, but I didnt never have a problem with mine. They are a lil high priced for no more of a gain they give you but hey 10 h.p. is 10 h.p. you didnt have before. GOO FOR ITT
    2002 Red Chevy RCSS (engine mods)- 05 5.3L, Procharger P-1SC 9lb.pulley, 80mm BBK TB, TB By-Pass, 38lb. Inj., AlkyControl Meth Kit, ASM L/T's, Magnaflow X-pipe, Borla's, FLT Level 5 4L65e, PI 3000 Stall, B&M Tranny Cooler, 3:73's, G-80, E-Fans, 160' Thermo. Custom Built Intake with K&N. WideBand 02 Sensor, DIXIE TUNED.

  7. #7
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    That's cheap for the power gain. Peeps are paying $400+ for LS6 intakes just to gain 15hp. $115 for 10HP is cheap.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

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