Quote:
Originally Posted by cob32187
What you are hearing is not the wastegate. You will never hear the wastegate. The wastegate is on the exhaust side of the turbo and routes exhaust gasses around, bypassing the turbine wheel to prevent over spooling. What you are hearing is because of the RPM drop, the engine itself is not taking as much air, so there is excess air in the intake system, and the noise is just the excess air backing up through the compressor wheel. The noise when it shifts and when you let off the throttle isn't really harmful. Surge, however, can cause serious turbo damage, from bending the compressor fins backwards to snapping the shaft. You will hear surge when you have the engine under load, and you will hear kind of a rapid "ch ch ch ch ch". It sounds like the noise you are already hearing, only does it constantly and rapidly.
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ok, thank you sir. so from what i gather...this new found noise under moderate boost upon shifting may not be a big deal.
this surge you speak of i have never noticed as it has never made a strange / abnormal noise under any load.
i guess that makes me feel better right now but i wish i knew exactly what the heck this is.
thank you much
