C5 Alternator "Decoupler" Pulleys

Reply Subscribe

Thread Tools

Search this Thread

Jun 1, 2010 | 12:10 AM

chileverde

Thread Starter

Racer

Joined: Mar 2010

Posts: 291

Likes: 1

From: Temecula Cali

C5 Alternator "Decoupler" Pulleys

I understand these came standard on '01 and up Corvette's and are available for retrofit as well to the 97-00 models.

I like the idea of allowing the alternator to take full advantage of it's inertia developed at higher rpms without being forced to reduce speed if driven at a 1:1 engine rpm to alternator rpm ratio.

Any 97-00 owners here do the pulley changeover?
Any noticeable improvements in nvh, mpg, or performance?

If you're not sure what I'm referring to, here's a few links...

http://www.decouplerpulley.com/resources.cfm

http://www.youtube.com/LitensOAD#p/u/10/Ly5-w1vH71w

http://www.youtube.com/LitensOAD

http://www.youtube.com/LitensOAD#p/u/5/uU6uo3XIufI

Cheers,
Rob

Last edited by chileverde; Jun 1, 2010 at 12:38 AM.

Jun 1, 2010 | 07:52 AM

Quicksilver Vert 01

Tech Contributor

Joined: May 2008

Posts: 3,100

Likes: 17

From: Somers, CT and Clermont, FL

St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16

Quote:

Originally Posted by chileverde

I understand these came standard on '01 and up Corvette's and are available for retrofit as well to the 97-00 models.

My understanding is that only A4 equipped Corvettes have the de-clutching type drive pulley on the alternator.

Jun 1, 2010 | 10:56 AM

chileverde

Thread Starter

Racer

Joined: Mar 2010

Posts: 291

Likes: 1

From: Temecula Cali

yes i think that's true - there was a tsb i read that was to fix pre '01 A4 corvettes complaining of nvh issues on the serpentine assy when turning in low speed parking lot type driving.

since it's not an issue on the 6 speeds, it's probably not used to then save costs.

rob

Jun 1, 2010 | 11:17 AM

corvettebob1

Melting Slicks

Joined: Dec 2003

Posts: 3,315

Likes: 17

From: Near Jacksonville Fl.

I put one on mine about a year ago, can't really quantify any improvements in the NVH but in theory it should reduce belt stretch thus reduce slipping when driving a blower.

Jun 2, 2010 | 09:41 AM

Mike Mercury

Team Owner

Joined: Apr 2001

Posts: 54,204

Likes: 180

From: S.W. Ohio. . . . . . NRA Life Member

Quote:

Originally Posted by Quicksilver Vert 01

My understanding is that only A4 equipped Corvettes have the de-clutching type drive pulley on the alternator.

that is correct; and it started during a model year.... though I can't remember specifically which one.

Removing the pulley is a PIA !!! Takes a special tool, though you can rig-up-something that will work.

#MN3400 http://www.metalnerd.com/cat05.htm

Jun 2, 2010 | 11:22 AM

Evil-Twin

Team Owner

Joined: Mar 2001

Posts: 21,325

Likes: 3,841

From: small town in S.E Pa. PA

St. Jude Donor '03-'04

So Many wrong answers WOW

I was intimately involved in this action when doing field debugging before I retired.. Field complaints sparked this debugging issue based solely on the complaints of customers about experiencing belt squeal on A4 only C5 Corvettes when going from [P] Park to Drive.
The clutch was added in 2000 to A4's. At that Time, the build went from the French made Valeo to the Mexican version.

Last edited by Evil-Twin; Jun 2, 2010 at 11:24 AM.

Jun 2, 2010 | 11:34 AM

RSchleder

Melting Slicks

Joined: Nov 2006

Posts: 2,431

Likes: 3

From: Iowa City Iowa

I changed mine on my 2000 about 4 years ago. I changed it as part of a witch hunt for the infamous low speed vibration when taking off and slowing down. Long story short, it was not cheap, I noticed absolutely no difference and still have the vibration.
I know, there's "other" causes for the vibration like the little springs at the exhaust attachment point, etc. Just have learned to put up with it as I don't have a lift to really find it. No big deal really.