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930 wastegate questions

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, is there a gasket for the wastegate body? If so, where would I find one?

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).....................|

Last edited by johnman001; 07-22-2007 at 12:12 AM..
Old 07-21-2007, 11:34 PM
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Sounds like the diaphragm.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

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Old 07-21-2007, 11:48 PM
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Quote:
Originally posted by NathanUK
Sounds like the diaphragm.
Nathan, can you elaborate on that?
John, according to others here on the board the parts to rebuild your stock wastegate (I'm assuming it's stock) will be expensive. You may considering replacing with a Tial wastegate.
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Old 07-22-2007, 07:12 AM
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I re-built mine (replaced the diaphragm) several years ago.

At the time, these guys sold a kit: Image Auto, Inc. 913-310-9927

I think it was about $100
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Old 07-22-2007, 09:06 AM
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Sorry about the double post.

It looks like a moderator moved my other one into this (the proper) forum.

Please close this thread as I will be using the other thread.

Thanks for your responses.

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 07-22-2007, 06:33 PM
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Quote:
Originally posted by Emission
I re-built mine (replaced the diaphragm) several years ago.

At the time, these guys sold a kit: Image Auto, Inc. 913-310-9927

I think it was about $100
I just sent an e-mail to Stephen Kasper at Imagine Auto (they are local to me) and will see what he says about a rebuild kit for the stock wastegate.
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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, 06:50 PM
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Quote:
Originally posted by johnman001
I just sent an e-mail to Stephen Kasper at Imagine Auto (they are local to me) and will see what he says about a rebuild kit for the stock wastegate.
Sorry, you are correct, it's "IMAGINE AUTO."
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Old 07-22-2007, 08:38 PM
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Apparently, they no longer sell repair kits.

They said that the diaphragm is available, but the gasket is not....

But, they would be happy to sell me a TiAL unit.
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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, 08:42 PM
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Quote:
Originally posted by johnman001
Apparently, they no longer sell repair kits.

They said that the diaphragm is available, but the gasket is not....

But, they would be happy to sell me a TiAL unit.
You should take yours apart and see what is bad before you proceed.

There are detailed threads on wastegate removal and disassembly. The springs are under some serious pressure, so read the threads before you have the thing 'spring open' in your face.

- Mike
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Old 07-22-2007, 10:03 PM
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Quote:
Originally posted by Emission
You should take yours apart and see what is bad before you proceed.

There are detailed threads on wastegate removal and disassembly. The springs are under some serious pressure, so read the threads before you have the thing 'spring open' in your face.

- Mike
If you could point me to one of the detailed disassembly threads I would greatly appreciate it. I did a search but came up without any threads on disassembly.

Thanks.
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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, 10:27 PM
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Try this:

Stock wastegate

Search on the "911 Technical Forum" for many other posts.
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Old 07-22-2007, 10:37 PM
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