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Old 11-28-2019, 02:06 PM   #1
STiSilly
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Crystal Black Silica

Default Ewg flutter

Hey guys, just a quick question, what's a good way to route the vacuum lines on the ebcs using Cobb's ebcs to make my ewg flutter?
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Last edited by STiSilly; 11-28-2019 at 02:17 PM.
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Old 11-30-2019, 11:11 AM   #2
kopele
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It will flutter in either of the two ebcs routing configurations. The flutter is caused by the pulse frequency of the signal from the ECU to the ebcs. I wasn't a fan of the flutter
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Old 11-30-2019, 12:40 PM   #3
Jay11STI
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If you are running and ECBS on a GR and up chassis sti then it will flutter.
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Old 12-01-2019, 12:26 PM   #4
ThinWRX
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Would changing the wastegaste spring help with that? It would be held closed longer and wouldn't flutter nearly as much correct? The flutter comes from the you building more boost than the wastegate can handle so it flutters. Am i wrong here?
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Old 12-01-2019, 02:12 PM   #5
kopele
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The flutter comes from the EBCS. The ECU sends a signal to the EBCS at about 15Hz, so the EBCS will apply pressure to the wastegate to close it at 15Hz. That's a bit slow and you can hear the wastegate opening and closing. If the spring is keeping the wastegate closed you won't hear the flutter until it overcomes the spring pressure. So yes, a higher pressure spring will delay the flutter, but not eliminate it.
You can eliminate the flutter by using a manual boost controller, Company 23 anti-surge EBCS, or changing the signal frequency provided by the ECU to 30Hz. Changing the frequency is possible with open source, not sure about other tuning methods.
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Old 12-01-2019, 08:25 PM   #6
STiSilly
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Update on this, I own a 19' sti using GS up pipe and Tials Mv-s 38mm along with cobbs 3 port ebcs. And I figured out that routing it like Grimmspeed's ebcs along with a 14lb spring would make it flutter, or lowering the spring down to a 10lbs spring and routing it like cobbs ebcs, of-course, both sides needs a tune at the very least.
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