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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #1  
Old 08-24-2011, 01:19 AM
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Default ASP Underdrive Pulley

just wondering if anyone here has run one or is running one. if so is it worth the price and have you had any issues with it?
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Old 08-24-2011, 01:39 AM
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When it comes to UD pulleys Ive ever only ran ATI pulleys and have had great success w/ them on my LS engines. They do make hemi pulleys, here is a link to their website.

http://www.atiracing.com/products/da...amchrysler.htm

They are usually a little more expensive than the rest, but engine parts are the one place Ive never though it was smart to cut corners with
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Old 08-24-2011, 01:45 AM
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so why would one use a Serpentine Dampers or under drive pulley?
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Old 08-24-2011, 09:06 AM
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There was history with the asp/motorblue pully blowing toner rings but it may of been corrected now.

Can't go wrong with ATI or Summit 20%. I have been running the Summit 20" UD for over year and love it. Spins up the rpm quicker. You will need a shorter belt too.
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Old 08-24-2011, 09:22 AM
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so all it does is makes the rpms spin up faster? I imagine that equats faster response from pedal to the tires?
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Old 08-24-2011, 09:29 AM
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It a supporting mod similar to an e-fan. Def' a good mod if you are cammed.
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Old 08-24-2011, 01:01 PM
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I've had my Summit racing 20% underdrive for months now and its great, don't know about power but it "revs" quicker.
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Old 08-24-2011, 01:13 PM
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so no real gains other then revs quicker?
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Old 08-24-2011, 01:23 PM
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Its a nice h/w upgrade esp' the price for the Summit
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Old 08-24-2011, 03:09 PM
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Quote:
Originally Posted by Drake371 View Post
so no real gains other then revs quicker?
think of the pulleys in terms of how they are on a bike. The crank pulley/damper is the drive pulley like the front/crank pulley on your bike. If you make that front pulley smaller it is easier to pedal. What this does is slow down all the accessories that are being driven by the serpentine belt thus freeing up some of the hp that was being consumed by the accessories.

If you are running a large aftermarket stereo/amps you will most likely need a slightly larger alternator pulley to compensate. Some alternators are not able to keep up with aftermarket stereos while idling if you've installed an u/d damper.
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