underdrive pulley
Thread Starter
Burning Brakes
Joined: Apr 2006
Posts: 976
Likes: 1
From: Lincoln NE
underdrive pulley
I'm about to do a cam swap... while i'm at it i'm gonna replace spring, rods, oil pump and timing chain... thinking about maybe doing a pulley... My understanding this slows down the other items in the belt system there by freeing up static power.. how does this effect the way those items work? I'm planning on installing a full PC in my dash here soon and will need some juice...
Burning Brakes
Joined: Jun 2005
Posts: 860
Likes: 0
From: Jacksonville Florida
Originally Posted by N0TDADYS_98
I'm about to do a cam swap... while i'm at it i'm gonna replace spring, rods, oil pump and timing chain... thinking about maybe doing a pulley... My understanding this slows down the other items in the belt system there by freeing up static power.. how does this effect the way those items work? I'm planning on installing a full PC in my dash here soon and will need some juice...
Since you'll need to pull the stock balancer off for the cam swap, this is the perfect time to install the pulley as it's considered "free" labor. There is a brand of pulley (I think SLP) that underdrives the crank, but not the a/c. The a/c belt remains the same. Good for warmer climates that need 100% air conditioning capability at idle and low engine speeds.
As for the other accessories, they are usually underdriven between 15% to 25% depending on brand of pulley. The one I am referring to above is at 20% I believe. My tuner says no issues with charging or engine cooling at idle but YMMV....
Racer
Joined: Oct 2003
Posts: 377
Likes: 2
From: Palm Beach Gardens FL
Look at LPE, they sell a 25% under drive ASP with along with a smaller pulley for the alternator spinning it at the standard speed while slowing down the PS and water pump. Works good, no problems here
Supporting Tuner
Joined: Sep 2004
Posts: 51,896
Likes: 39
From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
CI 6-7-8-9-10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
Zero problems under-driving your accessories (alternator, water pump, power steering, a/c). Gain is circa 12rwhp
Melting Slicks
Joined: Jun 2002
Posts: 2,246
Likes: 66
From: Middletown CT
Originally Posted by Bounty
Since you'll need to pull the stock balancer off for the cam swap, this is the perfect time to install the pulley as it's considered "free" labor. There is a brand of pulley (I think SLP) that underdrives the crank, but not the a/c. The a/c belt remains the same. Good for warmer climates that need 100% air conditioning capability at idle and low engine speeds.
As for the other accessories, they are usually underdriven between 15% to 25% depending on brand of pulley. The one I am referring to above is at 20% I believe. My tuner says no issues with charging or engine cooling at idle but YMMV....
As for the other accessories, they are usually underdriven between 15% to 25% depending on brand of pulley. The one I am referring to above is at 20% I believe. My tuner says no issues with charging or engine cooling at idle but YMMV....
If your interested in the Powerbond / SLP pulley, Dr. Chill is selling them in the "For sale" section at an excellent price. He only has a few left, so if you want one, contact him soon.
Burning Brakes
Joined: May 2006
Posts: 1,171
Likes: 2
From: foley al
Originally Posted by EnglandGreen
Zero problems under-driving your accessories (alternator, water pump, power steering, a/c). Gain is circa 12rwhp
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