Petrolhead
12-10-2014, 02:58 PM
Not sure if this is motor related at all but thought I would give it a shot anyways. I was wondering if any of you experts might be able to help me diagnose this noise. I have a B8.5 S4 and installed the AWE exhaust system with unresonated downpipes a couple months ago. Ever since the install I hear a pretty loud Flapping/buzzing sound at WOT. It usually occurs in 2nd and 3rd gear between 2500-3000 RPM. Sometimes it can also be heard in 4th but it is much less noticeable. The car also has to be in gear for the sound to occur. If I just rev the engine in neutral it sounds fine. Here is the sound in question:
https://docs.google.com/file/d/0BxkVAWKEAj-RWGlPYTVxYWljc0k/edit
Also, it seems to have some relation to torque. The more torque there is, the louder the sound. Please help! Thanks!!!
https://docs.google.com/file/d/0BxkVAWKEAj-RWGlPYTVxYWljc0k/edit
Also, it seems to have some relation to torque. The more torque there is, the louder the sound. Please help! Thanks!!!