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Join Date: Jan 2005
Location: Southern Indiana. formerly Kansas City, MO
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930 Wastegate Question

I just recently (the last time I rove my 930) noticed that my boost is suddenly higher than I have ever seen. The needle now extends well to the right. It seems to have plenty of power, but it concerned me so I tried staying off boost for the remainder of the drive.

I decided that the wastegate must be sticking or some problem with it.

I looked in my manuals and it said to apply pressure to the hose leading to it from the intercooler (control line).

I rigged up a regulator and a gauge and applied pressure to the line.

At .8 bar (12-13psi) the valve seems to remain closed. At 1.1 bar the valve can be heard to open and close, but a hissing sound can be heard as air is escaping somewhere.

The car always used to run about .8 bar until now.

My main questions are:

1.) Is the diaphragm supposed to hold pressure, or do the y leak slightly?

2.) If I buy a replacement diaphragm from Lindsey Racing, where would I get a new gasket for the wastegate body?

3.) Would a leaking diaphragm be a cause for this overboost condition?

4.) I have seen the TiAL wastegates and believe one of them to be a direct replacement for mine, but I would rather attempt rebuilding mine than spending the extra money right now on a wastegate. (I did read that a rebuilt wastegate may be short lived, but I still want to try).

5.) Are there any other sources for a gasket and the diaphragm?

Thanks for your help/advice. I may try giving Imagine Auto a try since they are local to me.

John
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John Flesburg
2016 981 Boxster S.................| 1983 911 Turbo - (White)
1974 911 3.2 - Red Car...........| 1974 914-6 3.2 - (Silver)
1974 914-6 3.2, GT -(Red).......| 1974 914 - Unit Body (TBD)
1971 914 (TBD).....................|
Old 07-21-2007, 06:53 PM
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Re: 930 Wastegate Question

Quote:
Originally posted by johnman001
I rigged up a regulator and a gauge and applied pressure to the line.

At .8 bar (12-13psi) the valve seems to remain closed. At 1.1 bar the valve can be heard to open and close, but a hissing sound can be heard as air is escaping somewhere.

The car always used to run about .8 bar until now.

My main questions are:

1.) Is the diaphragm supposed to hold pressure, or do the y leak slightly?

2.) If I buy a replacement diaphragm from Lindsey Racing, where would I get a new gasket for the wastegate body?

3.) Would a leaking diaphragm be a cause for this overboost condition?

4.) I have seen the TiAL wastegates and believe one of them to be a direct replacement for mine, but I would rather attempt rebuilding mine than spending the extra money right now on a wastegate. (I did read that a rebuilt wastegate may be short lived, but I still want to try).

5.) Are there any other sources for a gasket and the diaphragm?

Thanks for your help/advice. I may try giving Imagine Auto a try since they are local to me.

John
Did you hook the regulator to the control line for the wastegate? There is a vent also.

The diaphram isn't supposed to leak. However the valve guide will leak some and that is ok. A leaky diaphram will cause an overboost cond.

Imagine auto has the diaphram.
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Dean
911 SC turbo, 3.0L 930 motor, G50, 930 brakes, DTA EFI, 352 RWHP DynoDynamic dyno,
Old 07-22-2007, 04:30 AM
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there are 2 tial units available that would fit the 930 let me know if you would be interested in either.. I can beet anybodies price
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Current project 73 914-6 Gt project rusteration 2.4
Reproduction 914-6 oil tanks, 1-5/8" 914-6 heat exchangers source call 2623647426 or email mbconsulting21 @gmail.com
Old 07-22-2007, 04:42 AM
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Re: Re: 930 Wastegate Question

Quote:
Originally posted by dean
Did you hook the regulator to the control line for the wastegate? There is a vent also.

The diaphram isn't supposed to leak. However the valve guide will leak some and that is ok. A leaky diaphram will cause an overboost cond.

Imagine auto has the diaphram.
I put a regulator and a precision gauge in my compressed air line so I could determine the pressure it takes to open the wastegate.

The wastegate does not hold pressure or vacuum. I am thinking that the diaphragm is the leaky culprit.

I will try obtaining a diaphragm.



Are there any other gaskets in the wastegate housing?

Here is the only picture I found of the internals of a wastegate. Are there any missing parts?



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John Flesburg
2016 981 Boxster S.................| 1983 911 Turbo - (White)
1974 911 3.2 - Red Car...........| 1974 914-6 3.2 - (Silver)
1974 914-6 3.2, GT -(Red).......| 1974 914 - Unit Body (TBD)
1971 914 (TBD).....................|
Old 07-22-2007, 06:25 PM
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Quote:
Originally posted by mb911
there are 2 tial units available that would fit the 930 let me know if you would be interested in either.. I can beet anybodies price
Sending you an e-mail....
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John Flesburg
2016 981 Boxster S.................| 1983 911 Turbo - (White)
1974 911 3.2 - Red Car...........| 1974 914-6 3.2 - (Silver)
1974 914-6 3.2, GT -(Red).......| 1974 914 - Unit Body (TBD)
1971 914 (TBD).....................|
Old 07-22-2007, 08:44 PM
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