[Z06] Underdrive pulley?

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Mar 4, 2009 | 10:28 AM

Z-Stallion

Thread Starter

Burning Brakes

Joined: Feb 2009

Posts: 862

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From: DFW TX

Underdrive pulley?

For those that have installed it, did you notice any difference? Performance gain? Pros or Cons. I'm planning on having a cam, pulley, & LT headers installed pretty soon. Is there anything else that I should & should not do? Any advice is greatly appreciated. Thanks & have a great day!

Mar 4, 2009 | 11:50 AM

kerryt1

Drifting

Joined: Apr 2006

Posts: 1,876

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From: Edmond OK

I noticed that my crank pulley wasn't wobbling anymore. It will be off anyway for the cam install, it'd be stupid not to change it out. I have and recomend the Powerbond unit. It's a nice piece.

If you're ever going forced induction, nitrous, or the like...have the crank pulley / crank snout pinned.

Mar 4, 2009 | 12:10 PM

slothy

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Joined: Feb 2008

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From: St. Clair Shores Mi

Quote:

Originally Posted by kerryt1

If you're ever going forced induction, nitrous, or the like...have the crank pulley / crank snout pinned.

if he ever does go FI he'll be removing that UD pulley anyway for stock dia or OD one.

Mar 4, 2009 | 02:30 PM

Z-Stallion

Thread Starter

Burning Brakes

Joined: Feb 2009

Posts: 862

Likes: 1

From: DFW TX

Quote:

Originally Posted by slothy

if he ever does go FI he'll be removing that UD pulley anyway for stock dia or OD one.

So no need for the underdrive pulley if I decided to supercharged or turbocharged? Thanks

Mar 4, 2009 | 02:32 PM

slothy

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From: St. Clair Shores Mi

nope, you'll be spinning the s/c slower with a ud pulley, as for turbo pretty sure a ud pulley would give you benefits still its not belt driven.

Mar 5, 2009 | 12:11 AM

ls1impulse

Burning Brakes

Joined: May 2007

Posts: 841

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From: Gettysburg PA

What gains can be expected of a 25% underdrive? Also, are there any negatives to this in the Z06? Charging systems, headlights etc. will still function correctly?

Mar 5, 2009 | 08:04 AM

NemesisC5

Le Mans Master

Joined: Dec 2005

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From: Port Arthur, Texas 77642

Mar 5, 2009 | 03:22 PM

CarBoy

Drifting

Joined: Sep 2008

Posts: 1,273

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From: O'Fallon MO

Something to consider when doing a cam or heads or both. (and there is mixed opinions on this) Seriously consider putting in some SVO 30# injectors with your proposed upgrades. You can pick a full set up new for about $250.

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Mar 5, 2009 | 05:32 PM

jpandes

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Joined: Oct 2006

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From: Redwood City CA

Quote:

Originally Posted by ls1impulse

What gains can be expected of a 25% underdrive? Also, are there any negatives to this in the Z06? Charging systems, headlights etc. will still function correctly?

When having my cam install done, my tuner said that an UD pulley could give me ~9 rwhp.

Mar 5, 2009 | 05:51 PM

#10

ptindall

Team Owner

Joined: Aug 2006

Posts: 30,897

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From: Picking on the weakest kid in the yard.

I have one. No negative side effects for me. It runs very true and does not throw my belt as apposed to the stock pulley that wobbled and did throw my belt.

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