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02-15-2011, 06:24 AM
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#1 |
 Drives: 2010 Camaro SS Join Date: Dec 2010
Location: Central Valley, Ca
Posts: 25
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Can someone explain an Underdrive pulley?
Like the subject line says. Can someone explain what an Underdrive pulley does and what the pros and cons are please?
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02-15-2011, 06:37 AM
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#2 |
    Drives: 2011 Blue1SSRS 623RWHP, 02 vette Join Date: Aug 2010
Location: Richmond VA
Posts: 1,308
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Pros less HP stolen by static pull.
Con you Ac and alternator will turn slower. slight more hp for slight less AMP form your alternator and A/C pump. hope you understand that. |
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02-15-2011, 08:20 AM
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#3 |
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love. my. car.
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The under drive pulley never sounded that exciting to me for that reason. All your belt driven accessories will run more poorly. The mod may be cheap, but it has too many negatives for me to really want to use it. But, I'm not knocking anybody who uses one. A strong AC just happens to be a priority of mine!
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02-15-2011, 12:17 PM
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#4 |
Drives: Camaro LS M6, Fiero, Ford F100 Join Date: May 2010
Location: Ohio
Posts: 638
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It can free up some horsepower, but not a good idea on a daily driver, in my opinion.
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02-15-2011, 06:40 PM
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#5 |
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Account Suspended
Drives: 2011 Camaro SS LS3 6 speed. Join Date: Oct 2010
Location: St. Pete Beach, Florida
Posts: 115
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Years ago I had a 73 SS with all the fixings. Every single time I would hammer it she would throw a belt. I'm not a fan of aftermarket pulleys
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02-16-2011, 11:20 AM
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#6 |
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Drives: 01 SS Camaro / 07 Silverado Join Date: May 2009
Location: Lubbock, TX
Posts: 197
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Thousands of guys run these on LS cars with no problem. Yes it turns the accessories slower and probably not ideal if you are running a big stereo system or other accessories driven by the alternator. However, most guys are doing with with camshaft installs where the idle is already higher thus the accessories aren't really driven that much slower. It frees up another 7-8 hp for about $200. Not a bad gain for the money. I have yet to see a car that actually has a problem due to having a UD pulley on it.
Jon |
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02-17-2011, 08:52 AM
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#7 |
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Account Suspended
Drives: TAMPA TUNING FACEBOOK & INSTAGRAM Join Date: Oct 2010
Location: Tampa, Fl
Posts: 3,044
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I did the 25% reduction pulley after a cam exchange. It makes sense how you would gain HP, but the amount is questionable. In 9 years, Ive never had a problem with it, but my electrical system is stock except for 1100x driving lamps.
You have to remove the stock pulley when your doing a cam exchange, so the labor is none. If I would do it again, I doubt Id spend the money in that direction for the gains, but I do think there are gains. Phil |
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05-03-2011, 11:39 PM
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#8 |
Drives: 2010 ss rs ls3 red-white rallys Join Date: Oct 2008
Location: Mississippi
Posts: 729
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so when doing a cam change, this is highly recommended? about to get a cam and trying to decide if this is worth it....
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eps cam 226/234 lsa 113+2, bfe 1 7/8 headers, rotofab cai, katech oil pump, 444 rwhp, 411 rwtq, eps tune, Blanchard performance install
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05-04-2011, 01:54 AM
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#9 | |
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Search Ninja
Drives: 2010 Black 2SS/RS A6 Join Date: Oct 2009
Location: Central Ark
Posts: 7,183
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Quote:
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2010 Black 2SS/RS A6
Halltech CF 102 fed GPI modded intake manifold Bo (knows) White ported TB Kooks LT's/ Dynomax VT Pfadted (springs/sways) Dyno tuned by Rhino and GPI I once parallel parked a train. |
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05-04-2011, 01:37 PM
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#10 | |
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Drives: 2010 ss rs ls3 red-white rallys Join Date: Oct 2008
Location: Mississippi
Posts: 729
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Quote:
__________________
eps cam 226/234 lsa 113+2, bfe 1 7/8 headers, rotofab cai, katech oil pump, 444 rwhp, 411 rwtq, eps tune, Blanchard performance install
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05-04-2011, 01:50 PM
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#11 | |
Drives: 2011 IOM 2SS/RS Join Date: Dec 2010
Location: Chatham, Illinois
Posts: 756
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Quote:
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American Racing 1 7/8" Headers and Hi-Flow Cats, CAI cold air intake, Flowmaster AT exhaust, Vengeance Racing Stage 2 cam, VMax ported throttle body, TEA valve springs and titanium retainers, Trick Flow hardened pushrods, 180* T-stat, Comp Trunion kit, ZL1 Fuel Pump, ADM Fuel Pump Control Module, 20% window tint, Whipple Supercharger. Tuned by Mike Norris Motorsports. 656rwhp/584rwtq @10 PSI.
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05-04-2011, 04:04 PM
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#12 |
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Drives: 01 SS Camaro / 07 Silverado Join Date: May 2009
Location: Lubbock, TX
Posts: 197
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It's a good time to do it along with a cam swap because the pulley is already off the car. I would definitely do it if I were doing a cam swap. $200 for 8 RWHP isn't bad either.
Jon |
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05-04-2011, 11:21 PM
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#13 |
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Drives: 2010 ss rs ls3 red-white rallys Join Date: Oct 2008
Location: Mississippi
Posts: 729
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When talking about reliability, is it an upgrade or something you could have problems with over the stock pulley?
__________________
eps cam 226/234 lsa 113+2, bfe 1 7/8 headers, rotofab cai, katech oil pump, 444 rwhp, 411 rwtq, eps tune, Blanchard performance install
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05-05-2011, 06:50 PM
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#14 |
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Drives: 01 SS Camaro / 07 Silverado Join Date: May 2009
Location: Lubbock, TX
Posts: 197
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I have never seen an issue caused by an underdrive pulley other than a charge issue. If you did need it, you could run the overdrive alternator pulley and I don't see how it could hurt anything at all.
Jon |
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