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02-04-2010, 01:31 PM
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Junior Member
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Join Date: Feb 2010
Posts: 6
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underdrive pullys yes or no
do underdrive pullys actually give you hp gains on a dyno. are they worth it to put them on.
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02-04-2010, 02:59 PM
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Evan
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Join Date: Mar 2008
Location: Burleson, Texas
Posts: 352
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About 10 or 15hp normally. If you get them make sure it comes with an alternator pulley so it puts out enough power.
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'00 Silverado 4.8L
Cold air intake - Flowmaster Super 40
MSD Wires - Iridium Plugs
Cat/EGR Delete - 160 T-Stat
Shift Kit - Wide Band
Trailblazer Converter - Vette Servo
V tune - 3.90 True Trac
5/7 Drop - SS front end
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02-06-2010, 10:36 AM
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Paid Off
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Join Date: Aug 2007
Location: Gramercy
Posts: 495
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i have just an UD pulley no ALT pulley...works great imo.
i didnt notice a "seat of the pants" difference but we'll see what the track says.
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02-06-2010, 10:41 AM
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Site Supporter
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Join Date: Nov 2009
Location: chicago, il
Posts: 467
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__________________
Black 2005  Silverado 1500 Z71 5.3L 4X4 ECRB
stock 'till spring time
[Today 12:39 PM] bangbangskeetskeet: You suck it trebeck
[Today 06:47 PM] TxStVanWilder: get behind and rape me old man
[Today 09:38 PM] pl4yboy: Truckin, I need a cam for my PS3
[Today 10:21 AM] TATERNATOR: Just remember when we say nighty night keep your butt hole tight we mean it
[Today 09:24 AM] Duct_tape123: I wanna play with the hors!!!!!!!!!!
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02-06-2010, 10:50 AM
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10 sec club!!!
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Join Date: May 2008
Location: Round Rock, TX
Posts: 2,071
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Fixed for ya, usually gains of .1 -.2 tenths faster
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1995 ECSB, LS2, Wiley 80E, 3400 VIG, 4.10 Motive Gears, Detroit locker, Magnaflow stainless exhaust, 4link
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02-06-2010, 11:00 AM
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Site Supporter
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Join Date: Nov 2009
Location: chicago, il
Posts: 467
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That you, that's what I ment. Good thing there are lots of people on here with a keen eye 
__________________
Black 2005 Silverado 1500 Z71 5.3L 4X4 ECRB
stock 'till spring time
[Today 12:39 PM] bangbangskeetskeet: You suck it trebeck
[Today 06:47 PM] TxStVanWilder: get behind and rape me old man
[Today 09:38 PM] pl4yboy: Truckin, I need a cam for my PS3
[Today 10:21 AM] TATERNATOR: Just remember when we say nighty night keep your butt hole tight we mean it
[Today 09:24 AM] Duct_tape123: I wanna play with the hors!!!!!!!!!!
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02-07-2010, 11:26 AM
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go big, or go home.......
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Join Date: Dec 2009
Location: safford arizona
Posts: 73
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any one got a link to find some under drive pullys?
__________________
airaid cai
pacesetter shorties
flowmaster super 44's
superchips falshpaq tuner
20's wrapped in nitto dune grappler's
hid's and a few extra goodies....
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02-07-2010, 02:14 PM
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Evan
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Join Date: Mar 2008
Location: Burleson, Texas
Posts: 352
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__________________
'00 Silverado 4.8L
Cold air intake - Flowmaster Super 40
MSD Wires - Iridium Plugs
Cat/EGR Delete - 160 T-Stat
Shift Kit - Wide Band
Trailblazer Converter - Vette Servo
V tune - 3.90 True Trac
5/7 Drop - SS front end
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02-07-2010, 02:31 PM
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Senior Member
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Join Date: Mar 2007
Location: Newark, Delaware
Posts: 363
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IMO, if you have increased idle speed because of a cam or such, there's really no need for the alt. pulley.
__________________
99 Silverado ECSB 4X4, LQ4, Patriot Stage 2 243's w/ 59cc chambers, TR224-112, Pacesetter LT's, Nelson tune, FLT Lvl 5, Yank 3k stall, UD pulley, CAI, Ported Throttle body, TB Bypass, 160* t-stat, E-fans, 6'' Fabtech lift, 3'' Summit body lift, 37'' ProComp XTerrains, 4.56's, Zexel Torsen T-2, 4'' Rear shackle flip (no blocks)
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02-08-2010, 01:16 PM
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Senior Member
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Join Date: Jul 2009
Posts: 258
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I have never seen this before!
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04 Silverado Z-71 Extended Cab
Magnaflow, plug wires, tr-55ix, Synthetics, 33",leveling kit, tuned with HPTuners, CAI, Silverstar, vette servo
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Linear Mode
