Rattle at partial throttle / low rpm?
#16
This situation is all to familiar for me with the other vehicles I've owned... The dealer on one occasion told me it was an exhaust shield issue. Any modifications made to the car that would alter the functions of the car? I noticed with the Test pipes and y pipe I hear a rattle and squeak of air at times.
#17
#19
I know, mine sounds exactly the same, like loose chain rattling. But when I lean to the button of the car I found the noise was coming from there, not from the engine, although in the cabin it sounded like the engine rattling.
#20
#21
^ It happens at a very specific speed, gear and rpm. When downshifting and keeping the same rpm or speed, it doesn't happen.
I've been trying to capture it by placing a mic in various places but i can't get it to record well enough -- wind noise drowns it out. I can fairly capture the sound from within the cabin, but not enough to really understand which noise to keep note off.
Will keep trying, hopefully a good enough recording of it will help.
I've been trying to capture it by placing a mic in various places but i can't get it to record well enough -- wind noise drowns it out. I can fairly capture the sound from within the cabin, but not enough to really understand which noise to keep note off.
Will keep trying, hopefully a good enough recording of it will help.
#23
^ It happens at a very specific speed, gear and rpm. When downshifting and keeping the same rpm or speed, it doesn't happen.
I've been trying to capture it by placing a mic in various places but i can't get it to record well enough -- wind noise drowns it out. I can fairly capture the sound from within the cabin, but not enough to really understand which noise to keep note off.
Will keep trying, hopefully a good enough recording of it will help.
I've been trying to capture it by placing a mic in various places but i can't get it to record well enough -- wind noise drowns it out. I can fairly capture the sound from within the cabin, but not enough to really understand which noise to keep note off.
Will keep trying, hopefully a good enough recording of it will help.
#24
![Icon17](https://g35driver.com/forums/images/smilies/icon17.gif)
Seriously though, you have a good idea going on there. I wonder if a run on a dyno machine will work? That way i can have the hood open and pinpoint exactly where the noise is coming from?
What ur using to record? a cellphone? You can do what i did and put the cellphone inside a sock. it'll block out the wind noise immensely. I had to do this because my invidia xpipe was making a noise when accelerating and when the rpms would die down. bought a magnaflow resonated x pipe and hopefully the noise will go away.
p.s. What kind of noise on your xpipe? If it's a rattling at certain rpms, it could be the heatshield. That happened to me shortly after install, i bent back the shield and voila, no more rattle.
#25
Nah it ain't the heat shield. The closest description i can come up with is wind passing through loose metal causing a vibration+noise. I went under the car while someone else was revving it. It's coming from almost the center on the xpipe. Even holding the rpms above 2000 you can hear it clearly.
#27
I have the same problem and it's only when using the throttle very lightly. The description of a rattling chain noise is the best description. I've had for as long as I can remember and it's never really caused and issue (no power loss).
Glad to see it's not isolated to my car, but to be all honest I don't think it something to be concerned with. A friend of mine is a Master Tech at Audi and said not to worry about it unless it's affecting the driveability of the car, which at this point it hasn't.
When I first heard it I know I got all paranoid, but now it's only a radio volume increase away from being just right
Glad to see it's not isolated to my car, but to be all honest I don't think it something to be concerned with. A friend of mine is a Master Tech at Audi and said not to worry about it unless it's affecting the driveability of the car, which at this point it hasn't.
When I first heard it I know I got all paranoid, but now it's only a radio volume increase away from being just right
![Smilie](https://g35driver.com/forums/images/smilies/smile.gif)
#28
#29
Sorry to bump an old thread but I would like to see if anyone has found a resolution for this yet. I have been having this same issue for a while. I think that its something in the transmission or diff since it only happens under load. I have taken a video that captures the sound perfectly but can't get it to upload to youtube for some reason.
#30
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