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Join Date: Apr 2010
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Wastegate Mystery

I noticed on my 3 liter Turbo the wastegate has a bolt on the top in center. Should that be the vent or is it different on the 3 liter cars? The other port near the bottom is connected as it should.
Old 05-12-2010, 09:41 PM
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OFF THE BOOST PIPE NOW...
 
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I gotta think it should be like a 3.3 and vented. But what's keeping it from overboosting? Wouldn't a bolt in there do that?
Old 05-13-2010, 01:34 AM
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I was thinking the same that a bolt would create more boost not being able to release pressure. Just want to make sure what stock is and put it back if needed.
Old 05-13-2010, 01:41 PM
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Originally Posted by PORSCHETURBO930 View Post
I was thinking the same that a bolt would create more boost not being able to release pressure. Just want to make sure what stock is and put it back if needed.
Yep, it needs to be able to vent at the top of the housing or the diaphram won't move in response to boost pressure. If I recall, my stock WG had a banjo and hollow bolt up top and a steel line leading to nowhere. If your WG is working ok, then maybe you've got a banjo with the end cut off to allow it to vent? Just a thought...
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Old 05-13-2010, 03:25 PM
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Old 05-13-2010, 03:58 PM
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Old 05-13-2010, 04:57 PM
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89 930.
 
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According to some friends who use to race these. People would put a reg. long bolt in there and when they wanted more boost they would simply turn the bolt.
I have also seen one that had a flex cable welded to the bolt and run into the car to a adj. knob.
Easy boost controller.
I don't believe it is crucial that the top "breathes" There is not much top pressure in these (travel is quite small).
Old 05-14-2010, 07:24 AM
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Originally Posted by Benny771 View Post
According to some friends who use to race these. People would put a reg. long bolt in there and when they wanted more boost they would simply turn the bolt.
I have also seen one that had a flex cable welded to the bolt and run into the car to a adj. knob.
Easy boost controller.
I don't believe it is crucial that the top "breathes" There is not much top pressure in these (travel is quite small).
Good point Benny...having the top closed to atmospheric pressure may not have a big impact since the travel distance is so small.

As far as the bolt used to adjust spring tension on top, that has been discussed quite a bit over the years. Would have to spend some time searching threads to understand the pros and cons.
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Old 05-14-2010, 09:13 AM
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