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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 05-23-2012, 06:53 AM
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Default underdrive pulley!

can anyone tell me about underdrive pulleys! I know they dont add power but release what is being retained by the other pulleys! Are they worth yhe money?
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Old 05-23-2012, 07:59 AM
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Yes they do add power... The faster the motor spins up translates into HP!
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Old 05-23-2012, 12:34 PM
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X2, I have the 20% underdrive Summit racing one, good price and real nice piece.
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Old 05-23-2012, 12:44 PM
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Summit one here too. They don't create horsepower like other bolt ons, but they do remove restrictions on what you are currently making by reducing the parasitic losses caused by spinning the devices on your serpentine belt system.
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Old 05-23-2012, 12:54 PM
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Can u pust the url to the summit under drive pulley?
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Old 05-23-2012, 01:11 PM
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Hey, quick question for those of you who have the summit underdrive pulley. Is the pulley smaller? does it require a smaller belt or will the tensioner make up for this? And did you need a smaller alternator pulley or was there no issues there? I'm looking at picking one up too.
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Old 05-23-2012, 09:32 PM
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Much smaller diameter(ie.20%) and yes you need a shorter belt, Summit has the belt you need just ask, its a Goodyear Gatorback belt, unfortunately mine started squealing a few months later and I replaced it with the new style from Dayco and no more noise.
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Old 05-26-2012, 10:34 PM
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Here you go. Run the same and it helps in rpm spool.
http://www.summitracing.com/parts/SUM-C2516/

Quote:
Originally Posted by hemi08 View Post
Can u pust the url to the summit under drive pulley?
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Old 05-26-2012, 11:12 PM
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luckily for me, there use to be a guy who made the alt pulleys as a hobby..after sellin a few he decided not to make them anymore..


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Old 05-28-2012, 11:03 AM
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Thanks pumpkin!
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