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PostPosted: Sun Mar 08, 2015 7:45 am 
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Location: Seattle, WA
I'm not sure what the standard method is when it comes to welding an internally gated waste gate shut. If the arm is welded because the flapper door itself is not easily accessible then this seems to create a problem (my situation). I have 2 turbos now with loose flappers, each gate was welded shut from different welders, I advised them both to weld the gate with some preload to ensure a good seal. Booth waste gate doors are now loose by about the same amount, .003-.005 approx. When the gates were first done they were tight but after heat cycling they are now loose at the door. I believe this is caused by thermal expansion because a weld just holds static. So when the turbo heat cycles, expands then contracts the parts end up gaping at ambient temps.

My question is, would thermal expansion be enough to completely seal the door once hot or is this method of welding the arm just a bad idea all together because of this?

It seems to me the best method is either to gain access to the flapper weld it shut directly or rig up a bracket that can be preloaded to ensure a proper seal at all times.

Am I just over thinking this is or is this a real problem?

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PostPosted: Sun Mar 08, 2015 12:35 pm 
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Joined: Sun May 25, 2014 4:58 pm
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Location: la crosse wi
I was trying to decide what the best method would be for me. Since i have a bep hotside. Theres no flapper whatsoever, i am building my own 02 housing so im just going to weld in a piece of metal where the wastegate port is on the flange. my wastegate comes off of the manifold.


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PostPosted: Sun Mar 08, 2015 2:14 pm 
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I see, like so? http://www.extremepsi.com/store/images/d_6802.jpg

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89 Mirage Billet 20g 63t 12.4@120 417whp 400wtq @ English Racing.
89 Colt GT E316g
06 Silverado SS
07 ZX6R


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PostPosted: Sun Mar 08, 2015 11:09 pm 
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Location: la crosse wi
Ah no mines open theres nothing welded in there.
On the actual o2 housing that bolts to the hot side of the turbo is what im talking about


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PostPosted: Mon Mar 09, 2015 7:45 am 
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Ok, got it, well mine is basically the same way except there is a passage inside the turbine housing that wastes excess pressure into the main track, so even though it is plugged where you talking it wont work.

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89 Mirage Billet 20g 63t 12.4@120 417whp 400wtq @ English Racing.
89 Colt GT E316g
06 Silverado SS
07 ZX6R


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PostPosted: Fri Apr 03, 2015 3:51 pm 
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Joined: Mon Nov 12, 2012 11:54 am
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Location: New Harmony, IN
It's on a T3 housing, but I just cut a round plug and welded out in the hole so I could switch from using a 5 bolt flange to a vband with external gate.


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