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turbo noise??

2K views 3 replies 3 participants last post by  man show 
#1 ·
hey guys...
hope you can help on this one...
My car started making a sound sorta like a fan blade brushing on something after I had a fun run with some fellow subies and evos.
Now, the sound is not constant but is evident in certain rev at different gears.
Like say 1st, it will come out around 2,500rpm then disappear by 3k.
If in 2nd, it will come out at 4k then by 5k gone.
3rd, sometimes at 3k and sometimes at 4k.
But it doesn't happen all the time.
It's so unusual....
Any help will be appreciated.
Thanks!
 
#3 ·
yes it is the stock setup...
but I just changed my turbo recently and the noise was still there...
though this time it occurs very seldom and only for a brief moment...
not like before that occurs consistently...
but its still annoying when it occurs...
any other inputs??
thanks!
 
#4 ·
hmm.. I might be experiencing a similar sound - sort of sounds like a faint vibration or buzzing of a heatshield or some other thin metal piece for a really brief period of time. I'll have to pay closer attention to exactly when it's happening. My guess is it's nothing to worry about. I recently installed a Cobb catted dp and a Cobb turbo heat shield, so my guess is it has something to do with one of those pieces. What exactly does wastegate flutter sound like anyway?
 
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