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Metal-dragging-on-concrete sound when accelerating

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Old Feb 9, 2005 | 11:18 AM
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Default Metal-dragging-on-concrete sound when accelerating

When I go from a dig in my car, just normail stoplight city driving, from 0-2000 rpms i can hear this sound from the car that sounds like taking a piece of sheet metal and dragging it behind the car. once the car gets over 2000 rpms, the sound goes away instantly. this continues when i shift into each gear.

when the clutch pedal is depressed, or the transmission is in neutral, and i give it a little gas, there is no sound

it is a 99 z28 M6 with no mods except !FRA


any ideas? i have not noticed any power loss, but it is just annoying
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Old Feb 9, 2005 | 11:25 AM
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See if the drive shaft is rubbing on the tunnel brace.
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Old Feb 9, 2005 | 11:26 AM
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wouldnt i be able to hear that through all RPMs though?
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Old Feb 9, 2005 | 11:35 AM
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It could be it only does it when the engine is putting out more torque and loads the suspension so something rubs. It could be the I-pipe rubbing the driveshaft also.
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Old Feb 9, 2005 | 11:39 AM
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gotcha

i thought it was something worse like throwout bearing or transmission issues

how can i check that seeing as how the sound only occurs when the car is in gear and moving?
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Old Feb 9, 2005 | 11:40 AM
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Originally Posted by ttyson
gotcha

i thought it was something worse like throwout bearing or transmission issues

how can i check that seeing as how the sound only occurs when the car is in gear and moving?
Look for scratch marks on the driveshaft.
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Old Feb 9, 2005 | 11:51 AM
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you know come to think about it i had my trans rebuilt about a year ago and the shop didnt bolt the passenger side tunnel brace tight enough and the damn bolt fell off while i was driving!

maybe another bolt has come loose

bastards
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Old Feb 10, 2005 | 09:18 AM
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is it ok to just remove the tunnel brace altogether and run without one?
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Old Feb 10, 2005 | 11:30 AM
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I did in my 93 TA for 2 years.
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Old Feb 10, 2005 | 11:47 AM
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Mine's been gone for years too......all you need is the transmission crossbrace down there......as long as you have a good set of DD subframes
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Old Feb 10, 2005 | 11:48 AM
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mine is totally bone-stock

will it be alright or is my trans going to fall out lol
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Old Feb 10, 2005 | 12:20 PM
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sounds like the ds hitting the ypipe to me. easy visual check.
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Old Feb 28, 2005 | 11:04 AM
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i installed my catback today and there was no damage on the driveshaft from rubbing or anything else. it looked damn near brand new

so now i am thinking maybe it is something in the cats rattling around?
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Old Mar 1, 2005 | 08:26 AM
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to the top please
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Old Mar 1, 2005 | 02:52 PM
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anyone?
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