which underdriven pulley ?
TECH Enthusiast
Joined: Jan 2008
Posts: 504
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From: Michigan
March Performance Pulley systems are designed to increase horsepower by reducing accessory drag on your motor. March's new LS1 dampener pulley has a fluid based center, which will not cause spark sensors to retard timing with resultant loss of power. These pulleys have been dyno tested at 12 hp gain and are SFI approved. A new harmonic balancer bolt is included and the two required belts are listed below.
SLP's new 25% underdrive balancer for LS1/LS6/LS2 Corvette's incorporates a number of high-quality features you won't find on any other aftermarket unit. Chief among them are a pair of extra-tall belt-retention walls that eliminate the belt-slippage issues common to other balancers (see photo). Gains of up to 10 horsepower can be expected. Other unique design strengths include 100% steel construction (other brands use steel and aluminum), integral timing marks, and built-in puller-mounting threads. Includes a new balancer bolt and detailed installation instructions.
And I have the SLP one.
SLP's new 25% underdrive balancer for LS1/LS6/LS2 Corvette's incorporates a number of high-quality features you won't find on any other aftermarket unit. Chief among them are a pair of extra-tall belt-retention walls that eliminate the belt-slippage issues common to other balancers (see photo). Gains of up to 10 horsepower can be expected. Other unique design strengths include 100% steel construction (other brands use steel and aluminum), integral timing marks, and built-in puller-mounting threads. Includes a new balancer bolt and detailed installation instructions.
And I have the SLP one.
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Joined: Feb 2004
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From: Lexington, KY
Hmm I've never seen one at 10%. But I don't doubt you. Is that a march? I see they have 2 for the LS1 but it doesn't say what % under they are. Actually they look the same but it looks like one comes with the alternater pulley also. The march I bought from Thunder is 25% under. 10% wouldn't be worth doing.
I had a Powerbond 25% UD, and now run a full sized ATI Superdamper.