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Old 04-09-2013, 09:33 PM   #6
Scooby Newbie
Member#: 293626
Join Date: Sep 2011
Chapter/Region: NESIC
2011 WRX 4dr
DGM Stage 2+ pro-tuned


Thanks for the input. I figured that was the case with the higher-gear boost levels. The wastegate flutter would make sense too since changing the valve spring rate did nothing.

I was considering trying the Cobb XLE valve: anyone have this with a similar setup?

Also is the flutter even avoidable if it's supposed to be doing that, or would the flutter sound go away with a better seal? Seems like a silly way to regulate boost unless there's a technical reason for the oscillation like that?
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