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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 03-05-2013, 09:49 AM   #1
BossHogg
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** Under Drive Pulley **

What's the big performance gain with this pulley? What's the pros and cons to it? And is one brand better than the other ?
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Old 03-05-2013, 09:59 AM   #2
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Less parasitic loss from driving your water pump, altenator, ac and power steering at lower rpms. I'm not exactly sure about gen 5 Camaro's, but a 10% underdrive is usually good for 5-8 peak horsepower.
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Old 03-05-2013, 10:00 AM   #3
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The downside is your ac is going to be 10% less cold, your altenator is going to put out 10% less amps etc...
Haven't heard of it causing any issues though.
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Old 03-05-2013, 10:03 AM   #4
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I'm running the Fludampr 25% underdrive pulley. It has far superior balancing compared to the OE. The A/C pulley remains the stock diameter so the compressor rpm is not affected. You may notice a slightly tighter feel in the steering at low speeds. Charging system is normal. Others will claim that the alternator output is lowered. Totally false. The alternator is controlled by the BCM, output voltage is based on need.
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Old 03-05-2013, 10:09 AM   #5
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Sweet. I think that's gonna be the next mod, I'm about to order my VMAX ported throttle body then the Pulley.... Thanks for the info....
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Old 03-05-2013, 10:09 AM   #6
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Quote:
Originally Posted by LSX Camaro View Post
I'm running the Fludampr 25% underdrive pulley. It has far superior balancing compared to the OE. The A/C pulley remains the stock diameter so the compressor rpm is not affected. You may notice a slightly tighter feel in the steering at low speeds. Charging system is normal. Others will claim that the alternator output is lowered. Totally false. The alternator is controlled by the BCM, output voltage is based on need.
Is the steering really bad?
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Old 03-05-2013, 10:10 AM   #7
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Bc I noticed that their were 15% and 25% pulleys....
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Old 03-05-2013, 10:10 AM   #8
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Quote:
Originally Posted by LSX Camaro View Post
I'm running the Fludampr 25% underdrive pulley. It has far superior balancing compared to the OE. The A/C pulley remains the stock diameter so the compressor rpm is not affected. You may notice a slightly tighter feel in the steering at low speeds. Charging system is normal. Others will claim that the alternator output is lowered. Totally false. The alternator is controlled by the BCM, output voltage is based on need.
^^ This. I have the SLP 25% and have no negative side affects. I put it on the same time as a cam and headers, so I cant give you a performance gain for it, but people complaining about the A/C and charging system are crazy. I live in TX and last July my A/C almost froze my ass out of the car!!! I also have a 12" sub in the car. Still on original battery.
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Old 03-05-2013, 10:11 AM   #9
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Yea 376LS3 that's what kinda bothered me.. I also have a sub and amp in my car, I was just concerned...
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Old 03-05-2013, 10:13 AM   #10
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Is the steering really bad?
I didnt notice any issue with the steering....Anytime youre above an idle, the whole system is going to perform as if it was stock.
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Old 03-05-2013, 10:30 AM   #11
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No the steering is not bad at all. It is slightly tighter at idle. For example when driving in a parking lot. To me it feels better. As stated above anything above idle will be totally normal.
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Old 03-05-2013, 11:26 AM   #12
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Most put a pulley on with a cam swap and with the need for increased idle speed with the cam it offsets the powersteerings lowered speed.
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Old 03-05-2013, 12:37 PM   #13
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If on a budget then a powerbond is good, if you got the bucks then get an ATI. I've had a pb for years and never had a problem.
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Old 03-05-2013, 12:54 PM   #14
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I had a PB on mu 98 Z28 and it did fine.
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Old 03-05-2013, 01:21 PM   #15
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They're one of those things that most dont think about till they've already done all the normal/popular mods.

But we get orders for em weekly so....somebody knows.

All of em seem to be good for the money.
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Old 03-05-2013, 01:52 PM   #16
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it might, might not show a gain on the dyno.

but it will gain in the 1/4.
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Old 03-05-2013, 02:13 PM   #17
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Would there be n e added benefit if the 13's don't use a power steering pump?
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Old 03-05-2013, 03:03 PM   #18
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Quote:
Originally Posted by LSX Camaro View Post
I'm running the Fludampr 25% underdrive pulley. It has far superior balancing compared to the OE. The A/C pulley remains the stock diameter so the compressor rpm is not affected. You may notice a slightly tighter feel in the steering at low speeds. Charging system is normal. Others will claim that the alternator output is lowered. Totally false. The alternator is controlled by the BCM, output voltage is based on need.
Does it require a smaller belt to run this pulley?
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Old 03-05-2013, 03:55 PM   #19
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Yes a different belt will be necessary anytime you go to a smaller diameter pulley whether its a 10% or 25% UDP.
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Old 03-05-2013, 03:57 PM   #20
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Does it require a smaller belt to run this pulley?
BUT IF YOUR BOOSTED like your sig pic then you DON'T WANT TO ADD an underdrive because you'll loose boost! You want to add boost? Get an Overdrive pulley. Just my .2
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Old 03-05-2013, 08:49 PM   #21
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Would there be n e added benefit if the 13's don't use a power steering pump?
I installed a Power Bond 25% U/D on my 13 L99 on the dyno and it was worth 5 RWHP! :wink:
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Old 03-06-2013, 03:56 AM   #22
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That's a decent amount of work for 5 hp if ur not doin a cam swap.
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Old 03-06-2013, 05:37 AM   #23
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i plan on doing this as well
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Old 03-06-2013, 07:29 AM   #24
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Question is which one tho I like ati but they only offer 12% others are 25 is there a lot to be had w 13% more underdrive ??
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Old 03-06-2013, 07:34 AM   #25
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Question is which one tho I like ati but they only offer 12% others are 25 is there a lot to be had w 13% more underdrive ??
I'm running the Fludampr 25% underdrive pulley. It has far superior balancing compared to the OE. The A/C pulley remains the stock diameter so the compressor rpm is not affected. You may notice a slightly tighter feel in the steering at low speeds. Charging system is normal. Others will claim that the alternator output is lowered. Totally false. The alternator is controlled by the BCM, output voltage is based on need.

this is the one i will be going with because it does not cut any power to the ac compressor
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