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2009 CTS-V Black/Black, manual
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Discussion Starter #1
This is probably no big deal, but, I'd like to compare with others just to make sure it's no big deal. My v2 is stock, and I'm still breaking it in at 600 miles.

As you probably all know, when inside the v2 and sitting at idle, the car is very quiet, and the engine can barely be heard. But if I get out of the car and stand near the front with the hood still closed, it sounds like a small factory running under there. All kinds of different sounds ... :hmm: And the idle itself sounds a bit rough.

I wonder if you all could take a listen when you have the chance, and let me know if your v2 sounds about the same, or different ... ??

Thanks.

Rob
 

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'09 CTS-V Clack 6psd (manual), Recaro, Loaded...
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381 Posts
I'm not a V expert but became very comfortable hearing a good amount of lifter noise with all of my previous LS/LT cars. If it sounds like a sewing machine, you're good IMO.
 

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Owned 3 V's, now driving a Wrangler and XT5
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Yup, same here, all kinds of noises. I had the dealer check it and they said it was the injectors tapping. I wouldn't worry about it, I'm not.

Also, yes idle is a bit low sometimes as you can really feel the lumpy lope in the cam.
 

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11v,2 09 v's,2 05 v's,5 GTM supercars,viper,volt,2012 karma
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IF you want to pull your blower apart, i can make it quiet. The part isnt that expensive.
 

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2009 CTS-V Black/Black, manual
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Discussion Starter #6
Thanks everybody.

W4M, if you know the TSB number - that would be great. In any event, I intend to bring it up at the next dealer visit.

Thanks again!

Rob
 

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The TSB for "marble sound" at idle doesn't recommend a fix. If the noise goes away when the idle is raised, Dealers are told it doesn't indicate a problem and to leave it alone. It also mentions that it should only be noticeable standing in front of the car with either the hood open or your head next to the wheel well.

I believe I recall W4M mentioning in a different thread that he found the cause of the noise, but it requires pulling your blower apart and voiding the warranty on it if you want a quieter idle.
 

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Yes my fix is replacing the pos plastic torsional isolator with a solid non moving metal one.. The plastic one is a piece of crap and was eating my main pully shaft with the spring they have on it. At less than 500 miles mine had gouges and metal powder in it with ALL STOCK configuration and the shaft was wearing alot! This was at 500 miles... I will hate to see what people will do when they have that part fail on them at 30,000 miles or so. My marble sound went away 100% with the solid one. It is really quiet now.
 

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2009 CTS-V Black/Black, manual
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1,371 Posts
Discussion Starter #9
Thanks everybody.

W4M, if you know the TSB number - that would be great. In any event, I intend to bring it up at the next dealer visit.

Thanks again!

Rob
Bringing this post back to add a little more info.

If anyone is interested, the TSB # for this issue is: PIP4523A, (document ID = 2253881), and any dealer should be able to pull it up.

Bottom line is, my dealer will not install an aftermarket part, (such as W4M's replacement Torsional Isolator), in the supercharger, even if I offer to pay for labor charges. They would have to have authorization from GM to do so and retain warranty.

So, anyone wanting to do this will have to find a private shop to do it, or do it themselves, if so inclined, and hope that GM never finds out about it if there are issues. But that's just my dealer's policy, your dealers may vary, (I suppose ... ??).

Rob
 

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I just pulled apart a car with VERY VERY low miles on it, and the stock spring inside the dampner was horrible. It was digging in more than any others i have seen. I made a whole Video today of installing all the parts we sell on a car. Im going to be uploading it on youtube this weekend. IT should be a good show.
 

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2012 CTS-V
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239 Posts
I just pulled apart a car with VERY VERY low miles on it, and the stock spring inside the dampner was horrible. It was digging in more than any others i have seen. I made a whole Video today of installing all the parts we sell on a car. Im going to be uploading it on youtube this weekend. IT should be a good show.
Crap. Some years ago I bought a 1997 Jaguar XK8. Over time all of us XK8 owners learned of failed timing chain tensioners and waited with baited breath, for our engines to implode.

Now I hear that the car I bought to replace the Jag, may also implode one day.

I hope like heck GM acknowledges an issue very quickly, and gets a recall out there for us.
 

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2009 CTS-V Black/Black, manual
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Discussion Starter #14
Would this be an easy swap to do when changing the blower pulley?
Depends on which pulley you are referring to I suppose - if you mean the supercharger snout pulley, it may be easier because I understand the supercharger has to be, at least partially dis-assembled, to facilitate pressing the new pulley onto the snout shaft. W4M mentioned elsewhere that changing out the torsional isolator would be a major, (probably 2 man), job.

Rob
 

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Great thread guys. My car also sounds like a sewing machine.

However, what concerns me more is what she sounds like under moderate acceleration. The marble sound gets a lot louder, almost like pinging. I'm running 92 octane gas, so I'm not sure if this is normal or not.

Tony
 

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2009 CTS-V Black/Black, manual
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Discussion Starter #16
^^^ Hmmm - I hear it mostly at idle, but not at all otherwise. How many miles are on your v? I only have about 1,400 mi on mine.

Rob
 

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I'm concerned about the torsional isolator issue, and a little searching yielded this result:

http://www.autoblog.com/2008/03/05/video-corvette-zr1-eaton-supercharger-in-depth/

This is a link to two videos detailing the function of the Eaton 1900 and 2300 superchargers. The video shows the torsional isolator in the Vette ZR1, and it looks like it has a gray plastic piece in it, between two metal pieces at the front of the supercharger shaft. The second video comparing the two superchargers mentions nothing about a different torsional isolator for the Eaton 1900 (the V2 unit). Therefore, if there is an issue with our torsional isolator sucking, then the one on the ZR1 is likely just as bad.

Hasn't Eaton been making superchargers for a while? Did they really botch it, or could the piece in question be made that way on purpose?

From what I've read so far (having absolutely no real-world experience in building engines) the torsional isolator tries to isolate the supercharger from the waves of torque transmitted from the crankshaft. Apparently, this is done by dampening the torque waves using friction. The device shown in the video looked like two relatively flat metal cylinders on the front of the supercharger shaft with a plastic cylinder/ring between them. Maybe this thing works because the plastic piece, being so much lighter, will have a different resonant frequency(and different(less) inertia) than the metal pieces, and the vibrations will be dampened by friction between the metal parts and the plastic one in the center.

If the above speculation were based to some extent in truth, then a solid piece connecting the two ends (no sandwich/no friction) might sound better, but actually defeat the purpose of the device.

Am I completely smoking weed here? I am just trying to figure this thing out. Any thoughts?
 

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2012 CTS-V
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Great thread guys. My car also sounds like a sewing machine.

However, what concerns me more is what she sounds like under moderate acceleration. The marble sound gets a lot louder, almost like pinging. I'm running 92 octane gas, so I'm not sure if this is normal or not.

Tony
Mine sounds like a can of loose marbles at idle while standing in front of the car, but I've not hear any bad noises under acceleration. I'm running Shell 93 octane. I don't know exactly how many miles has on it (the car is in storage for the moment so I can't check) but I know it's in the 1400-1600 range.
 

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2009 CTS-V Black/Black, manual
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Discussion Starter #20
Only a few hundred.

Tony
If the noise is that bad at higher rpm, and you are running 92 or higher gas, I'd get it to the dealer fast, asking, "WTF ...?!". Seriously, that doesn't sound normal to me, and you probably should bring it to the dealers attention and have them at least document it, in case things get worse, IMO.

Rob
 
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