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Old 09-07-2018, 08:18 AM   #21  
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Also in the sake of full disclosure this is not a Miata, It’s an old 911 turbo. I can’t get any solid technical input from those forums. They’re not DIY thinking types. Mostly stuffed suits with stock cars.

Here’s a pic of the layout and why I am so reluctant to change things. Drain locations are tricky and any changes in height could jeopardize that. You can see the cut down turbine housings here too.
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Old 09-07-2018, 11:00 AM   #22  
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Its really clear now why it got so bad. The way it looks to be set up you probably have water standing in them almost all the time.
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Old 09-07-2018, 05:19 PM   #23  
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Just heard back from my machinist. He does not believe it’s the studs melting. He thinks it’s just rust from condensation when it sits. Gonna roll the dice and slap it back together with new cast housings.
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Old 09-07-2018, 05:21 PM   #24  
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Quote:
Originally Posted by 18psi View Post
Its really clear now why it got so bad. The way it looks to be set up you probably have water standing in them almost all the time.
I donít know how that could be. I live in a low humidity area. It gets run up to temp on most trips. I do let it idle when I get home to cool off the turbos. I donít see how it could be that.
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Old 09-07-2018, 05:57 PM   #25  
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I donít know how that could be. I live in a low humidity area. It gets run up to temp on most trips. I do let it idle when I get home to cool off the turbos. I donít see how it could be that.
With no anecdotal evidence to draw on and no experience with that sort of drain location I can't comment on the actual systems effectiveness, but I will say that water vapor is always going to be a byproduct of the combustion process.

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Old 09-08-2018, 03:32 PM   #26  
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Best comment yet...”did you pull those out of the ocean?” LOL.

So with all the surprised reactions from various turbo vendors and enthusiasts I have to believe this was an unusual situation. I am hoping by switching to E85 this will not happen again.
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Old 09-12-2018, 05:23 PM   #27  
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Final conclusion. The way these turbos sit in the car makes em susceptible to moisture pooling and rusting. I am going to swap to NiResist and sell off the new cast iron extrude housings. Check the classifieds if interested.
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