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Old 02-06-2002, 11:05 AM   #1
Tronner
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Member#: 12845
Join Date: Nov 2001
Chapter/Region: RMIC
Location: Denver, CO
Vehicle:
2008 STi
Silver

Default ? about TXS stage 1 to stage 2 sounds

I recently went from Turbo XS Stage 1 (with stock muffler) to Stage 2, still with stock muffler. I have a question about the sounds I am hearing.

Almost instantly when I start accelerating, I hear more of a whiney sound, which I'm sure is just the turbo, and that's no problem. But then, around 3000 rpms, I hear more of a whooshy, almost scratchy sound up until about 4000 rpms. Anybody know what this might be? I didn't hear it before with stage 1, but I have never been in anyone else's car who has a turbo back exhaust, so I don't know what it should sound like.
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Old 02-06-2002, 07:37 PM   #2
Tronner
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Member#: 12845
Join Date: Nov 2001
Chapter/Region: RMIC
Location: Denver, CO
Vehicle:
2008 STi
Silver

Default

OK, I just figured something out, and this may help. The noise is not at a certain rpm range, but it's at a certain throttle position. So no matter where the rpms are, if the throttle is at about 40 or 50% (guessing) the noise starts until I press the throttle a little more. Does the wastegate make a noise like that during acceleration? And is it dependent on throttle position?
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