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  #1  
Old 22-01-2011, 11:43 AM
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Default Drivetrain rubbing/grinding noise...solved?

I've had this f*cking annoying sound in my drivetrain lately, came about a few months after a new clutch was installed. Confusion as to whether its a HD organic sports or OEM replacement, invoice contradicts itself. Happens only under the following conditions:
* in gear, 0% throttle & cruising along...like slowing for a set of lights before engaging clutch.
* only when car is warm...assuming means the gearbox oil is warm too.
* loudest at 2-3000rpm.

Best way to describe the noise is with this video...when you listen to it you will understand why I am fed up with this noise & want it fixed!!!!!!11ntyOMGBBQRIBS



And another video... (~1:25>1:40 is the noise)



According to this thread - http://forums.nasioc.com/forums/show....php?t=1097682 - the noise is as a result of lightened flywheel with a relatively new clutch, something about there not being enough weight to stop something spinning or whatever.

My questions:
1. Does an 01-02GT come stock with a lightened flywheel?
2. Would a lightened flywheel be causing a slight squeal/shudder when driving around parking lots & a harsh on/off throttle response when crawling along at low speeds/rpm?
3. Can I get a heavier flywheel relatively easy & what are the drawbacks v. lightened? Slight loss of power?
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Old 22-01-2011, 11:52 AM
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It sounds like gear chatter.

1. But the Foz GT doesnt come with a light weight flywheel as standard.
2. No to the squeal. Yes to the harsher on/off throttle at low rpm
3. No loss of power/torque when going to a heavier flywheel. Only slight loss of throttle response.
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Old 22-01-2011, 02:37 PM
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Yeah there's plenty of name for it floating around, 'grubba grubba' is the most entertaining.

I can only assume that when the clutch was done the workshop installed a pre-machined lightened flywheel as opposed to the heavier one thats meant to go on. Explains the harsh on/off throttle around carparks & touchiness thats only been happening since it was done.

Will give the workshop a call Monday. Cheers!
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Old 22-01-2011, 03:07 PM
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LOL @ grubba grubba.. that perfectly explains the lightened flywheel decel noise.
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Old 22-01-2011, 03:18 PM
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Where/whats a good replacement if the workshop doesn't come to the party? OEM?
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Old 22-01-2011, 03:26 PM
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the flywheel has no moving parts, so its not making the noise.

more likley to be bearings in the gearbox.
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Old 22-01-2011, 04:34 PM
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doesn't really sound like a clutch type noise, like Tuna said it sounds like bearings, need to get it on a hoist and simulate the conditions to pinpoint it.
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Old 22-01-2011, 05:05 PM
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Nah I'm 99.999% sure it's right, none of the bearing noises match & I've already looked down that path with no success.
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Old 23-01-2011, 01:08 PM
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I'd be checking the diffs, even though it sounds like the gearbox, the rear diff reverberates the sound
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Old 23-01-2011, 01:18 PM
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my boss at work calls it garra garra noise.
ill speak to him tommorow and find out what he normally does to fix it
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