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Old 08-13-2017, 01:04 PM   #1
no694terry
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Join Date: Aug 2009
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98 Forester S/t
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Default How much should tial ewg valve guide leak?

Im starting to think my wastegatr tuning nightmares are caused from a worn wastegate. If i pull the bottom port line and blow into it, it feels almost like blowing through a restrictor pill. Now if i hook air compressor to it, the volume of air still opens gate.

My symtoms are needed extra duty cycle to open gate and then either spiking or falli g off to a few psi above spring presure. And very i consistant results tryi g to dial it in. Tried 2 mbc and 3 ebcs. F'in sick of it
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Old 08-13-2017, 02:20 PM   #2
subaru_gc8
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I had a problem with one of mine that was caused by the diaphragm leaking. you should try that
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Old 08-13-2017, 02:48 PM   #3
no694terry
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Thanks, i checked diaphram before and top port doesnt leak. Just feels like the valve guide leaks more than it should but i dont have a new one to compare. It needs like a leak down test
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Old 08-13-2017, 03:13 PM   #4
NA STI
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They all leak a lot through the valve guide even brand new out of the box, but I've found that the Turbosmart wastegates leak slightly less then Tial. Haven't had a problem with the diaphragm leaking on either.
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Old 08-14-2017, 11:26 AM   #5
SoloWRXSTi
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I have tested both Tial and TurbSmart wastegates and they all do this................on the bench. It's my belief that they are loose at room temp but tighten up at operating temperature.
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Old 08-14-2017, 07:19 PM   #6
no694terry
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Thanks. I rerouted plumbing to attack boost from the top port. No leaks there so hopefully its more stable. So far so good
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Old 08-14-2017, 11:53 PM   #7
WhatTurboLag?
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They are designed to leak from there. This was what I was told from TiAL directly.

I was concerned aswell when I did a boost leak test not knowing to leave the gate out of the test.

I did oil the valve and it seemed to quiet it down though.
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