20v keep blowing turbo, help please

[twoqu]

Are we right to assume that the stock turbo died a death of the same problem on a stock engine prior to modification?

[george21]

In that case I also doubt the software is causing this to happen, anyway if I read right it did the same thing with another turbo and different software. Which means it must be something to do with hardware, but what

Just a thought, have you tried another wastegate? In theroy it could be sticking and causing the turbo to overspin.

You are right this is very very frustrating, i blew first turbo, thought ok, it is an old one and gave up, then done a volvo k24 setup (prj map)= blew up, ok it is and old turbo as well and then bought this k27/26 new one and it did again!!
After volvo turbo failure i start changing parts like n75, dump valve, checking oil pressure, breathing system and so on and on.
At the moment i fitted standard aby turbocharger until i figure out what it's bloody wrong with it. Even thinking to pay somebody to help me out as i run out of ideas!!
Maybe mr Brian(tonks) fancy a lovely job ?!

[george21]

Are we right to assume that the stock turbo died a death of the same problem on a stock engine prior to modification?

Yes and no. I bought engine from s2 n300 which was out of the car already and fitted it into my ur quattro and turbo was smoking almost after first start up. After few runs it was more and more smoke. But symptoms was same or similar.
Is it possible that oil i'm using 20/50 to thick and not lubricating enough or causing other damage?

[K Simmonds]

Yes and no. I bought engine from s2 n300 which was out of the car already and fitted it into my ur quattro and turbo was smoking almost after first start up. After few runs it was more and more smoke. But symptoms was same or similar.
Is it possible that oil i'm using 20/50 to thick and not lubricating enough or causing other damage?

20/50 is on the thick side but I really can't see it causing the problem unless you consistantly thrashed the pants off the car when stone cold, once up to operating temp it should be fine.

[twoqu]

I guess oil is cheaper than turbo's! The lubrication system is pretty robust on these unlesss you go mental on revs. Might be worth trying a cheap reasonable quality oil with say a 10 rating as an experiment.
Of course if the problem was already present and we don't know what oil grade was used previously then we are clutching at straws really without any definitive suspect. If the engine was out of a forum members car we might be able to look at any previous posts for clues.

[george21]

Well, changed oil to semi 10/40 to run about and disconected n75 to see what boost spring is holding, what it should be, around 0.7 bar? Also notised a smell of petol from oil i took it out and while breather was out, smell of fuel from sump, is that normal?
Another thing can i run about with k24 turbo while mapping it's for k27 with 440 green giants?

[twoqu]

Should be more like 0.4 bar.
Petrol in the oil is never good as it compromises the lubrication properties of the oil!
Depends if it is overfuelling or whether the injectors are leaking. Still something else to kick you in the ****!
Its a shame we can't point the finger definitively at either the lubrication system or abuse of the turbo.
Would have been better to revert back to a more std set up to trouble shoot it. Guess thats not possible once the ecu has been modified.

[george21]

Should be more like 0.4 bar.
Petrol in the oil is never good as it compromises the lubrication properties of the oil!
Depends if it is overfuelling or whether the injectors are leaking. Still something else to kick you in the ****!
Its a shame we can't point the finger definitively at either the lubrication system or abuse of the turbo.
Would have been better to revert back to a more std set up to trouble shoot it. Guess thats not possible once the ecu has been modified.

That it is what i want to do revert it back to standard and just run it to see how things goes( that is what i should done it first place, but wanted to be a smart ***) i still got ecu from aan, is that will fit?!
i just need a standard software. still have original injectors. So only mods staying is rs2 manifold and 3" system
So you saying standard spring boost is 0.4? I got 10psi which is 0.7 bar

[twoqu]

As long as the AAN ecu is unimmmo it should be ok.
Without the N75 the spring pressure should be in the 0.4 region so it needs a small adjustment for stock settings at least.

[newsh]

You might have a non standard spring in there, PRJ maps for stock WG spring so best to fit one.

[george21]

You might have a non standard spring in there, PRJ maps for stock WG spring so best to fit one.

spring is standard, just somebody before me had a play with the top screw. i tried to get it right to standard boost pressure and i did to 0.7 bar. but aparently standard boost pressure is 0.4 bar. is that posibility that on the high boot those 0.3 bar diferent could cause my turbo to overspin?

[K Simmonds]

I'm not sure if that's the cause of your problems, but it won't be helping that's for certain. With the new software and RS2 turbo I've had to tweek mine up a little to stop it creeping open as the boost comes in on WOT applications but my base line boost is still less than 0.5, it's around 0.45.

[george21]

I'm not sure if that's the cause of your problems, but it won't be helping that's for certain. With the new software and RS2 turbo I've had to tweek mine up a little to stop it creeping open as the boost comes in on WOT applications but my base line boost is still less than 0.5, it's around 0.45.

I'll get that down to 0.4 bar then!
Another thought i done nothing to the fuel delivery apart from changing lines all the way. I mean it is standard setup for ur quattro with standard pump etc. maybe i'm runing lean on high boost? Normaly those pumps pump around 5-6 bar not sure about how many litres tho. Maybe it is stupid thought but..

[rxl]

why is petrol spell is in your oil? in my opinion look there first...
buy few s2 standard turbos so you can get them fried...
put it to standard springboost injectors...
got some photos of your problems?

[george21]

why is petrol spell is in your oil? in my opinion look there first...
buy few s2 standard turbos so you can get them fried...
put it to standard springboost injectors...
got some photos of your problems?

1. Why it's smels petrol i don't know
2. Standard turbo fitted
3. Standard boost
4 what photos, damaged turbo?