Ever since I had my Cobb TBE exhaust installed and flashed the Cobb Stg II map, I think
I've been experiencing some significant wastegate flutter.
Here are the symptoms I've noticed:
~ Ticking sound from engine bay. It's fairly loud, especially when the windows are rolled down and the sound is reflected off curbs and medians.
~ The ticking sound is only present under light/moderate load between 1,750 - 2,500 RPM. Under very light or heavy load, the ticking sound disappears. (Or maybe I can no longer hear it over my exhaust... lol)
~ I have been unable to pin-point the exact location of the sound.
~ The sound is very "mechanical." In other words, it doesn't sound like metal parts colliding.
~ Under moderate load, the engine speed varies ~200 RPM, almost like the car is surging. The surging can also be heard in the exhaust note.
~ Under light or heavy load, the surging goes away, and acceleration is smooth.
So, does this sound like wastegate flutter or something else? If it is WG flutter, I may live with it until I find a used VFxx. I plan on upgrading the TMIC, turbo, and fuel pump this Fall. Can WG flutter affect the longevity of the engine? (I've noticed it for the last 2 or 3 months) If so, I'll tighten the WG actuator arm and leave it as-is until a bigger turbo is installed. Or, I could have an EWG installed...talk about no lag and an amazing sound!
Any help would be appreciated! :)