20v keep blowing turbo, help please

[george21]

Pretty sure my oil pump has that washer, I get 1.8-2.0 bar on hot idle and off the scale cold.

I covered 5/6K miles running 1.0 bar on my RS2 hybrid and have since done about 1K miles running 1.9 peak 1.5 at the red line, inspected the turbo the other day and it's like new still. However I feel I'm pushing my luck a bit so I'm going to be bolting on a full K24 7200 very soon.

Well then... My problem it is not oil related then!? Is it?
Had a turbo off today, shaft it is bent and touching sides on the cold side of the turbo!
I don't know guys, i'm lost, gona burn the fcker, had enough

[Error404]

As others have said, that 3mm shim is supposed to be there

[george21]

As others have said, that 3mm shim is supposed to be there

But why on earth it doesn't show as a part on etka. Maybe i missed something

[Error404]

It does its p/n 034115197, shown as a supplementary part under the complete oil pump

[quattro-nick]

i still think it's an oilfeed problem
i drove with 1.5 bar redline with rs2 turbo for 1000km without problems
maybe you can replace the oilfilterhousing?
do you have a egt meter in the car?

[george21]

It does its p/n 034115197, shown as a supplementary part under the complete oil pump

It doesn't show here tho!
http://forums.audiworld.com/audi-ori...95/?styleid=12
or here

[george21]

i still think it's an oilfeed problem
i drove with 1.5 bar redline with rs2 turbo for 1000km without problems
maybe you can replace the oilfilterhousing?
do you have a egt meter in the car?

Turbo rebuilder says that twisted shafts it's most likely turbocharger stalling on high boost, (n75, dump valve?) i will know more tomorrow then it's taken apart.

[quattro-nick]

good luck!
keep us posted

[george21]

yep, shaft is twisted, cold side f---ed

turbo man says that it is likely that turbo stalled , surge, which means faulty dump valve or n75 or or.... i don't know anymore.
(dump valve and n75 new from germanautospares)

[quattro-nick]

have you checked that the tube that go from dumpvalve back to hose turbo inlet is open? and is the litte vacuum tube from dumpvalve to intake okay,no leaks and good connection?

[twoqu]

Might not be of much use but this is the first time I have ever seen oil pressures mentioned for the K26. They are for the Porsche variant but should be comparable.
Max warm oil pressure 5 Bar.
Max cold oil pressure 8 Bar.

http://www.full-race.com/store/turbos/borgwarner-airwerks/borgwarner-k26-turbo.html

[twoqu]

What was the thinking behind using a 20/50 grade oil rather than say a 5 or 10/40 or even a 10 or 15/50?

[george21]

What was the thinking behind using a 20/50 grade oil rather than say a 5 or 10/40 or even a 10 or 15/50?

Good question, i thought it is the best oil to use !
Am i wrong?

[K Simmonds]

It's a bit think unless you live somewhere really hot, 10/50 is about the best for our climate IMO.

[twoqu]

Good question, i thought it is the best oil to use !
Am i wrong?

Its quite a minefield!

http://www.s2forum.com/forum/showthread.php?t=18357&highlight=oil

Shame the Turbo guy can't be more definitive as that would help. If was from being stalled then that suggests the BPV. Not impossible to install the BPV backwards or even a new component to be be faulty. If it was through surge then thats a function of the turbo characteristics which may or maybe not be solvable through careful mapping or worst case a better choice of turbo.
If its not on the car, i.e the oiling system, then its might be something to do with the incompatability of the turbo with your goals. The K7400 has a relatively small turbine which makes it a poor choice for elavated power levels. A K27 hybrid can be a pick n mix of many components which might not be compatable. Do you know the exact spec in terms of comp wheel and turbine housing etc?
Is the software compatable with the turbo?
I am guessing that the car did not have the same characteristic before so basically its a matter of backtracking to see what has been changed and how that might effect things!