Technical Low turbo pressure on 20v

[elberto]

Hi everybody!
I have bought a 20v turbo and I've found this problem: manometer says I have these 0,5/0,6 bar (standard/peak) on mainfold.

I was thinking it's turbine failure (it's still the original one and car has 100.000 km), but oil level is always good and it doesn't smoke at all.
I tried to change also screw-regulation of waste-gate valve, but I haven't felt any difference.
So I suppose there could be any air-pipe damaged.
I will soon place two manometers: one on the mainfold, the other on the turbine to check if there are pressure differences.

Any suggestions?
Thanks.

 

[hockeymadsi]

leaking exhaust manifold can cause low boost pressure, as the exhaust gases that drive the turbine are escaping before they get to the turbo. try check the gaskets.
also try looking at the inlet hoses for cracking if their old hoses.
another thing to check if the intercooler is leaking.

good luck mate.

 

[ChrisUK]

:yeahthat:

Manifold's cracking is really common fault on the 20V Turbo's.

 

[bulldog5046]

bit of an old thread but beeing as its running base boost i would be suspicous of the EBV being open, possibly stuck open.

is the injector light on?

 

[Rustbucket]

Or knackered turbo? What is mileage and has it been modded/decatted?

 

[elberto]

Yhanks for answers (I read it just now, notify doesn't work!)

1) I've been thinking about exhaust mainfold broken (I know it's very common trouble), but I heard a particular sound on all Coupè with mainfold broken, not in myne; so I think it isn't that the trouble.

2)no lights switched on

3)car has got 103.000 km, original supercharger. I know it could have problems, but at the same time it doesn't smoke and it doesn't eat oil.

3)if I unplug the wastegate, pressure sounds ok, I'll try to connect a digital manometer with memory

4)what is "EBV"? The "Pierburg" valve?

 

[ChrisUK]

My manifold was cracked to buggery and didn't sound out like it was broken at all!.

 

[bulldog5046]

yes the peirburg valve, they have been known to fail in which case it would fail open by default as the motor wont be operating.

its worth a try if you can borrow or get one from a scrap yard

Ry

 

[coupe20valveturbo]

where is this valve as mine has the same problem from time to time pics if possible