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Discussion Starter #1
hey guys, my Evo has an issue under boost. It has been tuned but still running the stock turbo. This is the noise it makes under boost, has anyone had this issue or know what it could be? AFR reads fine and no codes are being thrown at all

http://instagr.am/p/CBeaHwMnWba/
 

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Discussion Starter #3
The second video you can hear it better, just sounds like constant flutter through boost almost like air is escaping
 

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That sounds like a DV flutter. Usually happens with a stock DV and going low speeds and easing into full open throttle. The air is stuttering through the diaphragm since it didn't get a sudden boost to close the valve completely. Get a boost guage/reader. You already know your AFR are fine, just got to check if you are actually hitting your boost that you're tuned to. It should be fine as long as it's not happening every time you're boosting.
 
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