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Old 12-18-2013, 09:26 PM   #35
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Old 12-18-2013, 09:30 PM   #36
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Originally Posted by OldScoolCamaro View Post
..and when the car goes out of warranty, the S/C will make noise again with the stock unit....the gall on the shaft with the coupler wear is designed to be that way. Eaton engineering. It's baked in the cake, and it won't fail, it just sounds like marbles in a can. You can replace all the factory S/C's you want under warranty, fact is the noise will always be there after time.
Just to be clear, (marbles in a can) is the isolator rattle and you are correct... I've never been worried about that since a smaller pulley has always been in the plan. The problem I have is definitely a failure. It's extremely loud.

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This has nothing to do with the isolator which is a rattle, this is a constant whine that increases with throttle but can no longer be heard above 3000 because of the engine noise. My isolator as described stopped making noise around 2000 miles as it probably has grooved the shaft.
Thanks for confirming. Exactly what I have which is bearing and full SC replacement.
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Old 12-18-2013, 10:07 PM   #37
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Just to be clear, (marbles in a can) is the isolator rattle and you are correct... I've never been worried about that since a smaller pulley has always been in the plan. The problem I have is definitely a failure. It's extremely loud.

Thanks for confirming. Exactly what I have which is bearing and full SC replacement.
...did you have the unit repaired yet? Anything that becomes a howl, grind, whine, or constant noise of one type or another that progressively gets louder over time and useage is going to grenade and fail. Intermittent noise that is a nusaince is different.
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Old 12-18-2013, 10:50 PM   #38
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...did you have the unit repaired yet? Anything that becomes a howl, grind, whine, or constant noise of one type or another that progressively gets louder over time and useage is going to grenade and fail. Intermittent noise that is a nusaince is different.
Car is at dealer and SC is on order. Mine was squealing pretty bad.

I had just gone though 3/4 tank of hard back roads driving with some other cars. Didn't notice it until I pulled into the garage, but it definitely wasn't going away.
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Old 12-19-2013, 10:00 PM   #39
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Car is at dealer and SC is on order. Mine was squealing pretty bad.

I had just gone though 3/4 tank of hard back roads driving with some other cars. Didn't notice it until I pulled into the garage, but it definitely wasn't going away.
I hope you are back and up and running in short order. I've been lucky so far with mine. Just the usual infrequent noises here and there that we have seen reported. Nothing that raises any concern. The good thing is that Chevy will take care of it no doubt!
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Old 01-08-2014, 01:36 PM   #40
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I hope you are back and up and running in short order. I've been lucky so far with mine. Just the usual infrequent noises here and there that we have seen reported. Nothing that raises any concern. The good thing is that Chevy will take care of it no doubt!
Called yesterday and the SC has been on backorder for 3 weeks now..

Started a list of all of these here
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Old 01-08-2014, 04:01 PM   #41
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I want to believe this is true. But I would also like to see an article or something from Eaton about this situation. Just for peace of mind.

there is a huge write up over on the CTSV forums you can search out. I can't remeber if was a GM or eaton engineer posting in the thread. the wear in the shaft is by design. they consider it accpeptable it never eats into the shaft far enough to mechanically make it fail.

people call it an eaton thing but if my memory is correct it is a GM/eaton thing. the ford unit's use a coupler not issolator on some models. Hence the aftermaket going to a coupler on this blower as well. these shops did not just pull that out of their .... well you knows.

This blower is custom made for GM by eaton.

I read up about this stuff before I even had a car. LSA has been out since 2009. this is nothing new people just did not reasearch the engine before they bought the car. I was trying to figure out the best mods for the engine and stumbled into that stuff. there was no info on this site yet.

my rattle is livable right now and my bearing is quiet but I knew full well these would be issue I may have to deal with at some point before I had a car in my driveway.
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Old 01-09-2014, 11:07 AM   #42
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Does anyone know if this was resolved for the 2014 model year?.
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Old 01-09-2014, 01:19 PM   #43
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Does anyone know if this was resolved for the 2014 model year?.
to my knowlege there has been nothing done because GM and eaton have not acknowleged any issue publicly that I have seen.

the issolator rattle that some people don't like is by design and will not change. now why the bearings on some are running dry could be a manufactuing or QC issue so who knows how that will all play out.

I have not heard one comment about a revision to the assembly in any way though. Maybe someone who is getting the swap will know if the assembly has been revised in any way.
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Old 04-07-2014, 12:32 PM   #44
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My ZL1 has 4432 miles and now it is making a rattling noise from the supercharger. Is this something a performance shop could fix???? Sounds like having the dealer replacing the supercharger will only be a temporarily fix.
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Old 04-07-2014, 12:35 PM   #45
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My ZL1 has 4432 miles and now it is making a rattling noise from the supercharger. Is this something a performance shop could fix???? Sounds like having the dealer replacing the supercharger will only be a temporarily fix.
GM has a updated SC that can replace yours and it has a solid isolator in it, getting them to do it is another thing.
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Old 04-07-2014, 01:06 PM   #46
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My ZL1 has 4432 miles and now it is making a rattling noise from the supercharger. Is this something a performance shop could fix???? Sounds like having the dealer replacing the supercharger will only be a temporarily fix.
having the dealer replace it retains the warranty and would cost nothing.

having a speed shop fix it would void the warranty and you would have to foot the bill.

It will be up to the dealer to decide if the rattle exceeds the permissible level and falls under the warranty.

From what we understand, it seems that somewhere, perhaps for the 2014 MY, the SC was changed, and now uses a solid coupler now rather than the spring loaded one. If that's true, then the replacement SC the dealer would install would have the same fix that a speed shop would have done. replace the spring-loaded coupler with a solid one.

the entire SC is a single replaceable unit so the dealer would be replacing the entire unit, not just the coupler for a solid one.

Let the dealer fix it under warranty.
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Old 04-07-2014, 03:01 PM   #47
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some bitches whine all the time, they start off slow, then when they want something, they begin to whine. Yours obviously wants something, are you feeding it premium?
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Old 04-07-2014, 07:17 PM   #48
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the rattling noise and the squeal are two totally diff things... you guys need to realize there IS NOTHING THE COUPLER CAN DO THAT WILL CAUSE A SQUEAL. it could fall into pieces and t would not squeal. it simply connects to shafts together... that's it.. if the car is squealing it IS NOT THE COUPLER...
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Old 04-07-2014, 07:20 PM   #49
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My ZL1 has 4432 miles and now it is making a rattling noise from the supercharger. Is this something a performance shop could fix???? Sounds like having the dealer replacing the supercharger will only be a temporarily fix.
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the rattling noise and the squeal are two totally diff things... you guys need to realize there IS NOTHING THE COUPLER CAN DO THAT WILL CAUSE A SQUEAL. it could fall into pieces and t would not squeal. it simply connects to shafts together... that's it.. if the car is squealing it IS NOT THE COUPLER...
Thats what he said "rattle"
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Old 04-18-2014, 09:49 AM   #50
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Supercharger rattle

I took my car to the dealer and I was told that the rattle was normal. Not only that...that there wasn't a check engine light on so there wasn't a problem. I just had a performance shop check the isolator coupler and the coupler was broken. Had them replace with a solid isolator and no more rattle.
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Old 04-18-2014, 10:01 AM   #51
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I took my car to the dealer and I was told that the rattle was normal. Not only that...that there wasn't a check engine light on so there wasn't a problem. I just had a performance shop check the isolator coupler and the coupler was broken. Had them replace with a solid isolator and no more rattle.
from what I can remember, the original bulletin from GM regarding the rattle gave some guidelines for judging if the rattle noise was a true warranty concern or not.

A certain amount of rattle was/is entirely normal due to the design. However (and this is where my memory fails me), I believe it stated that if the rattle was still present above 1500rpm, then that was abnormal and they would replace the SC as a unit.
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