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02-03-2008, 10:03 AM
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#1
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Join Date: May 2006
Location: Midland Park, NJ
Posts: 1,389
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Underdrive Pulley?
In researching a cam for my car it was mentioned to me that since the crank pulley must be removed its a good idea to purchase an underdrive pulley. Has any experianced and charging or cooling issues using an underdrive pulley in their LSX vehical? I would imagine on a hot day in traffic there may be some overheating issues. Has anyone had any problems with this or are LSX vehicals void of thses issues?
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02-03-2008, 10:13 AM
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#2
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Personally I think that they aren't worth it in most cases. There are better ways to make power.
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02-03-2008, 10:43 AM
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#3
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Join Date: Aug 2007
Location: Piscataway, N.J.
Posts: 1,729
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I have one on my 350 1991 Formula. It's one those things that is supposed to give you an EXTRA 5 hp. Yeah right. If I really believed ALL the claims for every item that I bolted onto my engine I should have 538 hp by now!  The car runs fine, no overheating or charging issues, but I would have to assume that you should have a GOOD battery to start off with, and not plan to have six 500 amp speakers and your A/C going full blast in a 2 hour traffic jam.
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1991 FORMULA 350-GONE BUT NOT FORGOTTEN
1 of 1,197 with L98 Option/13.79@100 mph
1994 25th ANNIVERSARY TRANS AM GT -1 of ONLY 2,000 made/ Only 128 made with a HURST 6-Speed Manual and 91 with T-Tops and Compact Disc/ K & N Filtercharger/Magnaflow Performance Muffler/Air Foil- ORIGINAL MINT Arctic White Ultra Rare SURVIVOR. DAYTONA 500 PACE CAR Decal Kit!
SOLD: 1989 Turbo T/A in 1991 it ran 12:18@115 mph
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02-03-2008, 11:17 AM
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#4
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10 Second Club; Has fan club
Join Date: Dec 2005
Location: Delmont nj
Posts: 4,369
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i had the UD pulley on my car, it caused no issues whatsoever.
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01' Z06 62k miles. Vararam, Longtubes, off road xpipe, tuned by me. Times TBA
2001 Corvette, Bolt ons , tuned 10.75@124.56 mph 1.38 60' Sold
1997 Saturn Sc1 5spd DOHC swapped
Bolt ons, decked head, stock intake cam on exhaust side, lotsa weight redux
13.22@102.32 mph 1.93 60'
12's on moda? One day
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02-03-2008, 11:41 AM
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#5
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Join Date: Aug 2005
Location: Millville & Little ferry New Jersey
Posts: 454
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I changed mine because at W.o.t. my belt would slip on occassion which seems to be common on LS-1's
I did my research and got a Powerbond 25% u.d. pulley, it is SFI approved and they also happen to be the supplier for SLP except that they sell for alot cheaper under the Powerbond name
I daily drive mine and never had a problem with anything
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2002 Z/28 = Firemutt Racing 370 w/ Cam, Trick Flow heads, TPIS 90mm Intake & 90mm T.B., Vigilante 3600 t.c., Michael's Transmissions Built 4L60E.
QTP Headers, Mufflex Stainless Y-pipe, Pypes Performance Exhaust, Moser 12-bolt w/ 33 spline axles,Truetrac & 3:73's., Spohn.
Cartek Tuned...
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02-03-2008, 03:40 PM
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#6
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11 Second Club
Join Date: Feb 2007
Location: elmer
Posts: 274
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theres no downside, just alot of money... ive got an ASP
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87 TURBO T-- 02 Z28
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02-03-2008, 06:04 PM
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#7
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Resident Camera Guy
Join Date: Aug 2004
Location: North Jersey
Posts: 10,971
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I've had one on my Lt1 for a few years and I noticed power surges at idle with the stereo on. I might have had a bad battery but I did notice I had charging issues, and at the time I was daily driving.
Now with the new motor I have a Fluidamper Crank Pulley with a new battery and I no longer have any surging issues or un-explained power loss!
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02-04-2008, 02:03 AM
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#8
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Join Date: Oct 2005
Location: Old Bridge Twp., NJ
Posts: 235
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Have a 25% ASP on my LS1, I think it let's my car rev up alil quicker, I wouldn't boast about any big HP gains tho. No problems at all w/ charging/cooling. I could only see it being a problem if you have a big audio system in your car.
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'00 Z/28 - *SOLD* 383 Stroker, H/C, Full Boltons
'06 GSX1300R - Full Yoshi TRS Exhaust, PC3, TRE, 17/42 Setup, Sm Airbox Mod, R6 Throttle
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02-04-2008, 07:12 AM
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#9
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NJFBOA Supporting Sponsor
Join Date: Feb 2006
Location: HULMEVILLE, PA
Posts: 2,023
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it is worth it just to have a better SFI approve dampner..
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JSSPEEDANDCUSTOM.COM
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02-04-2008, 07:05 PM
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#10
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Join Date: Mar 2007
Location: Elmer
Posts: 225
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When i got my new cam i did the underdrive pulley installed at the same time. I have not had any overheating problems in traffic or otherwise. I was also told that the UD pulley wont really make more horsepower but drop about a tenth of quarter time. Not sure how true that is because I also am never going to this mechanic ever again.
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 The faster I go the happier I am.
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