exploded view of 930 wastegate?

[h20cooled7]

anyone have one of these for a 80 930 ? parts fische link or anything? I just want to be sure i put mine back together right

[beepbeep]

Search and you will find:

[juicersr]

Goran, great shot. Is there a way to tell what bar spring you have? Did the factory every put anything other than .8 bar spring, and did weltmeister, and other mnftrs use a way to identify springs like TIAL does? I got a used factory wastegate last year for a project, and it came with an extra spring, which the guy i bought it from wasnt sure if it was .8 or 1 bar. thanks

[h20cooled7]

very cool thank you!

[beepbeep]

Main problem is that boost is not proportional to spring tension only. A spring will deliver different boost depending on sizing of turbo, exhaust backpressure, muffler design etc.

So what was 0.7 bar spring can become 0.9 bar spring of Zork tube is fitted.

[juicersr]

Originally Posted by beepbeep

Main problem is that boost is not proportional to spring tension only. A spring will deliver different boost depending on sizing of turbo, exhaust backpressure, muffler design etc.

So what was 0.7 bar spring can become 0.9 bar spring of Zork tube is fitted.

Ahhh. Is this part of the effect known as 'Boost Creep?'

[beepbeep]

Originally Posted by juicersr

Ahhh. Is this part of the effect known as 'Boost Creep?'

No, it's just that exhaust gases will find it easier to escape trough wastegate if backpressure trough turbo is higher. They take path of least resistance.

Boost creep is when wastegate is too small to scavenge gases even when fully opened...so boost starts to raise at higher revs. This is usually not an issue with 930 wastegate as its valve is big enough.

[lucittm]

Juice,
I take full credit for those pictures that Goran unashamedly posted. The second one was the pinched diaphragm from the PO's mechanic. That necessitated the rebuild shown in the first picture.

One more thing, the gasket between the cast iron valve body and the aluminum valve guide section is no longer available and when it tears upon disassembly, you will be OOL.

Mark

[beepbeep]

I'm sorry for not giving correct credits, I just searched for "wastegate picture" and pasted the picture URL.

[Rasta Monsta]

Originally Posted by lucittm

One more thing, the gasket between the cast iron valve body and the aluminum valve guide section is no longer available and when it tears upon disassembly, you will be OOL.

Old thread I know. . .this still the case? Alternatives (other than junking the WG)?

[johnman001]

Originally Posted by Rasta Monsta

Old thread I know. . .this still the case? Alternatives (other than junking the WG)?

I bought ultra-high temperature, very thick gasket material from McMaster Carr and made my own gasket for the NLA one. It worked fine.



I do, however, like the TiAL WG that is a direct replacement.

[brettm69]

Originally Posted by lucittm

Juice,
I take full credit for those pictures that Goran unashamedly posted. The second one was the pinched diaphragm from the PO's mechanic. That necessitated the rebuild shown in the first picture.

One more thing, the gasket between the cast iron valve body and the aluminum valve guide section is no longer available and when it tears upon disassembly, you will be OOL.

Mark

Why not use some generic 'sheet' gasket & a sharp X-ACTO

Also, I believe it's SOL, not OOL

Brett

[Rasta Monsta]

It's not paper, it's about 1/8" thick asbestos, and needs to be airtight or you'll have an intake leak.

[johnman001]

Originally Posted by Rasta Monsta

It's not paper, it's about 1/8" thick asbestos, and needs to be airtight or you'll have an intake leak.

Who said anything about paper?

Extra high-temperature gasket material (yes even 1/8" thick) is available in sheet form. It may be expensive, but it is available. It works well.

[Rasta Monsta]

Well, I just started exploring McMaster's website a couple of nights ago, and I clearly have some learning to do about materials.

FWIW, Andial have a few of these left, so I bought one. . .figure it will be good for another 40 years.