I'm having a very strange situation where my Stage 1 tuned s3 makes a grinding/scraping noise when coming at full boost. It has a 3" DP and decat pipe.
Since owning the car I've done the following:
New DV
New Vac lines
New Forge DV and N75 hoses
Turbo reconditioned with brand new hot side and actuator
Replaced leaking manifold
New gaskets turbo to manifold and turbo to downpipe
New MAF
Checked boost hoses and clamps except the one behind the drivers headlight
Full Service
New HG
Red powerflex dogbone
Polytek'd engine mounts
DP aligned away from prop as much as possible
Upgraded fuel pump
Fitted oversized Badger5 billet tip
Refurbed both front CV joints
Checked boost via gauge and its 20psi tapering down to 13psi
The noise is only at full boost and disappears completely as soon as you come off boost. I replaced the turbo fearing that it was caused by the play it had but I'm annoyed the noise still exists. It sounds like a metal on metal sort of hollow noise.
If it was a driveshaft touching something then I'm guessing it would do it most of the time or at particular speeds. Now that I've strengthened the engine mounts the engine shouldn't be moving much at all.
The only things I've noticed is the decat pipe gasket looks like it could do with replacing and the egt sensor despite being tightened, I can still move the pipe. Is that normal?
Since owning the car I've done the following:
New DV
New Vac lines
New Forge DV and N75 hoses
Turbo reconditioned with brand new hot side and actuator
Replaced leaking manifold
New gaskets turbo to manifold and turbo to downpipe
New MAF
Checked boost hoses and clamps except the one behind the drivers headlight
Full Service
New HG
Red powerflex dogbone
Polytek'd engine mounts
DP aligned away from prop as much as possible
Upgraded fuel pump
Fitted oversized Badger5 billet tip
Refurbed both front CV joints
Checked boost via gauge and its 20psi tapering down to 13psi
The noise is only at full boost and disappears completely as soon as you come off boost. I replaced the turbo fearing that it was caused by the play it had but I'm annoyed the noise still exists. It sounds like a metal on metal sort of hollow noise.
If it was a driveshaft touching something then I'm guessing it would do it most of the time or at particular speeds. Now that I've strengthened the engine mounts the engine shouldn't be moving much at all.
The only things I've noticed is the decat pipe gasket looks like it could do with replacing and the egt sensor despite being tightened, I can still move the pipe. Is that normal?
