If its possible I would go back and measure the oil pressure cold and hot again and see whether its dropped compared to what you had before.
I would also remove the wastegate cap and physically examine the spring. Either post a pic or measure the total height and ideally the wire thickness so we can determine whether it is a stock one.
Shouldn't really have a strong smell of petrol in relatively fresh oil so that might indicate an injector issue which for piece of mind might warrant a test session for leaking and flow.
Of course none of this might be the cause of your problem. The boost profile for that Volvo turbo according to PRJ is a 1.9 bar peak and 1.7 bar redline! How marginal that is I don't know but of the two turbos surely the one with the smaller turbine would be more likely to overspeed. Whether the extra 0.3bar base is necessary to achieve that I am unsure as the profile was quoted on a 1.9 bar spring and a flat out N75 by the look of it!
The K27/26 also has a similiar profile. So in theory neither should have been knackered at the boost levels you have quoted. We know that the stock oil system is adequate for most needs and that the KKK turbo are usually pretty durable.
As for the fuel pump, essentially it is the wrong spec for a 20V. The 10V pumps are biased towards high pressure for the K-jet and less volume whereas the Motronic wants higher flow with less pressure. At sometime might be worth looking at say a 044. Can't see a connection between this and the turbo issue!
I would also remove the wastegate cap and physically examine the spring. Either post a pic or measure the total height and ideally the wire thickness so we can determine whether it is a stock one.
Shouldn't really have a strong smell of petrol in relatively fresh oil so that might indicate an injector issue which for piece of mind might warrant a test session for leaking and flow.
Of course none of this might be the cause of your problem. The boost profile for that Volvo turbo according to PRJ is a 1.9 bar peak and 1.7 bar redline! How marginal that is I don't know but of the two turbos surely the one with the smaller turbine would be more likely to overspeed. Whether the extra 0.3bar base is necessary to achieve that I am unsure as the profile was quoted on a 1.9 bar spring and a flat out N75 by the look of it!
The K27/26 also has a similiar profile. So in theory neither should have been knackered at the boost levels you have quoted. We know that the stock oil system is adequate for most needs and that the KKK turbo are usually pretty durable.
As for the fuel pump, essentially it is the wrong spec for a 20V. The 10V pumps are biased towards high pressure for the K-jet and less volume whereas the Motronic wants higher flow with less pressure. At sometime might be worth looking at say a 044. Can't see a connection between this and the turbo issue!
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