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Join Date: Sep 2002
Location: Westchester County, NY
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wastegate valve seating question

As per my other post, I have exhaust puffing out my wastegate dump pipe even at idle. I can pressurize the line on the WG and when I take it off can hear the valve thunk as it returns to closed position.

For those who perhaps have had their stock wastegates apart, the flange that the valve seats on is actually seperate; it slides over the four studs and a gasket goes between it and the header. When I slide the seat over the studs and it comes in contact with the valve face, there is still a space between the flange and the cast body of the WG. What I've noticed during install is that when I tighten the nuts, I can run the nuts all the way down and close up that space. Should I go that far, or is that possible unseating the valve and causing my WG to pass exhaust even at idle?

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Originally Posted by gsxrken View Post
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1986 930, 1969 Mach1, 2003 540 Sport, 2016 R1200RS
Old 01-15-2010, 03:33 PM
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AFAIK, its got to be torqued down. I think that closing this "gap" between the seat/flange and the cast wastegate body is what creates the necessary pressure between the valve and seat.
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Old 01-15-2010, 04:34 PM
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Update- I determined that you do need to tighten it so that the gap disappears. I loosened mine and something seemed to "pop" into place. I then went around and equally snugged each nut about a 1/2 turn at a time, and the valve now seats properly and exhaust does not leak out the dump pipe at idle. In hindsight, if you did not tighten so that the gap closed, some gases could escape through the gap rather than out the dump pipe when the WG opened. Live and learn (and post for the next guy using Search).
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Old 01-18-2010, 11:37 AM
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It's put together that way so you can replace just the valve seat if needed.
Old 01-18-2010, 02:05 PM
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