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Downpipe and turbine wheel whistle

 
Old May 31, 2016, 12:32 PM
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Downpipe and turbine wheel whistle

This might sound like a dumb question, but do aftermarket downpipes make the exhaust turbine sound noticeable inside the car. The reason why is my buddy put a turbo xs downpipe on his wrx, and you can hear the turbine wheel spool inside the car. It sounded really sound so I was just wondering.

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Old May 31, 2016, 01:16 PM
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Originally Posted by Jbevoxx View Post
This might sound like a dumb question, but do aftermarket downpipes make the exhaust turbine sound noticeable inside the car. The reason why is my buddy put a turbo xs downpipe on his wrx, and you can hear the turbine wheel spool inside the car. It sounded really sound so I was just wondering.

Thanks
The Evo doesn't seem to make a whistle regardless of the exhaust setup. I think it has something to do with an anti surge housing or the size of the turbine wheel. I could be wrong though.
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Old May 31, 2016, 01:29 PM
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Mine wasn't super audible with my stock turbo, now on my EFR 7163 it's very loud. I agree it doesn't seem to have anything to do with the downpipe though.
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Old May 31, 2016, 01:35 PM
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Appreciate the feedback
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Old Jun 6, 2016, 01:31 PM
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An intake will give you the sound your looking for. A downpipe to a test pipe and full exhaust will allow you to hear the turbo out the exhaust at low speeds if outside the car.
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Old Jun 8, 2016, 08:21 AM
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I did turbo back exhaust and ram air intake and there was no noticeable whistle, lots more woosh and psshh but no whistle. I swapped the stock turbo for an MHI 18K and now it whistles a lot, any time I'm accelerating beyond 3000rpm it is clearly audible if not loud.
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Old Jun 8, 2016, 11:44 AM
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Originally Posted by KVandy15 View Post
I did turbo back exhaust and ram air intake and there was no noticeable whistle, lots more woosh and psshh but no whistle. I swapped the stock turbo for an MHI 18K and now it whistles a lot, any time I'm accelerating beyond 3000rpm it is clearly audible if not loud.
That the anti-surge compressor cover, not the turbine.
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