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Old 02-03-2008, 10:03 AM   #1
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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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Old 02-03-2008, 10:13 AM   #2
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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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Old 02-03-2008, 10:43 AM   #3
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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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Old 02-03-2008, 11:17 AM   #4
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i had the UD pulley on my car, it caused no issues whatsoever.
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Old 02-03-2008, 11:41 AM   #5
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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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Old 02-03-2008, 03:40 PM   #6
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theres no downside, just alot of money... ive got an ASP
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Old 02-03-2008, 06:04 PM   #7
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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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Old 02-04-2008, 02:03 AM   #8
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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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Old 02-04-2008, 07:12 AM   #9
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it is worth it just to have a better SFI approve dampner..
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Old 02-04-2008, 07:05 PM   #10
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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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