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Need help on a noise....

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Old Aug 2, 2012 | 11:53 AM
  #1  
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From: 2007 Nat'l Corvette Challenge 11.50 index Champ. New Jersey
Default Need help on a noise....

No help in the Z06 sx, so I figured I'd try over here.

http://forums.corvetteforum.com/c6-z...his-sound.html

Thanks!

Ron
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Old Aug 2, 2012 | 03:37 PM
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No one here either??
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Old Aug 2, 2012 | 06:28 PM
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If you can't hear it with the car on the ground, don't worry about it man. If it's a problem, it'll become louder and louder over time. If it becomes louder, and dealer tells you it's normal with a month left on the warranty, then ask some questions.

The only thing I'd do for now is either change the differential fluid (a good idea after break-in anyway), or at least check the level, to make sure it's not low. Enjoy your car.
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Old Aug 4, 2012 | 12:11 AM
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From: 2007 Nat'l Corvette Challenge 11.50 index Champ. New Jersey
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Originally Posted by ELP_JC
If you can't hear it with the car on the ground, don't worry about it man. If it's a problem, it'll become louder and louder over time. If it becomes louder, and dealer tells you it's normal with a month left on the warranty, then ask some questions.

The only thing I'd do for now is either change the differential fluid (a good idea after break-in anyway), or at least check the level, to make sure it's not low. Enjoy your car.
I DID hear it on the ground while driving. Sounded like a brake pad hanging up on the rotor. Had the diff fluid swapped and I think it's gone. I drove only on roads where I had a lot of road noise since so I will listen again tomorrow.
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Old Aug 4, 2012 | 12:36 AM
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That sounds like normal noise from gear lash and an idling engine. This is only happening when you have a neutral load on the engine. The engine rpm will flutter a little when idling and with no positive or negative load against it, this rpm fluctuation will be transmitted through the transmission and rear end gears.

If it bugs you that much, you could trade your vette for one with an automatic transmission. The automatics don't do this because the torque converter absorbs the rpm fluctuations.
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Old Aug 4, 2012 | 10:46 AM
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Originally Posted by 1fatcat
That sounds like normal noise from gear lash and an idling engine. This is only happening when you have a neutral load on the engine. The engine rpm will flutter a little when idling and with no positive or negative load against it, this rpm fluctuation will be transmitted through the transmission and rear end gears.

If it bugs you that much, you could trade your vette for one with an automatic transmission. The automatics don't do this because the torque converter absorbs the rpm fluctuations.
Exactly .. sounds like the engine is running rough with induces these uneven rotational inputs ... knows as "NURDS" (None Uniform Roational DerivitiveS)...go enjoy your car.
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Old Aug 8, 2012 | 11:03 AM
  #7  
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From: 2007 Nat'l Corvette Challenge 11.50 index Champ. New Jersey
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Originally Posted by 1fatcat
That sounds like normal noise from gear lash and an idling engine. This is only happening when you have a neutral load on the engine. The engine rpm will flutter a little when idling and with no positive or negative load against it, this rpm fluctuation will be transmitted through the transmission and rear end gears.

If it bugs you that much, you could trade your vette for one with an automatic transmission. The automatics don't do this because the torque converter absorbs the rpm fluctuations.
NEVER!!!! lol


Originally Posted by MachAll 2005
Exactly .. sounds like the engine is running rough with induces these uneven rotational inputs ... knows as "NURDS" (None Uniform Roational DerivitiveS)...go enjoy your car.
Taking it to ECS Friday to let Doug have a lsten. we shall see. Hopefully it's just ME and NOT the car!

Ron
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