Help sorting my underboosting S2?

[gunman]

Back from the garage now and the test was somewhat inconclusive. We could see no smoke form anywhere, tested the IM on it's own and the IC. The machine was showing a flow though when connected up to the entire system, although no smoke was seen. His theory was that the turbo seals had gone and it was leaking into the exhaust. He reckoned that we weren't seeing smoke in the exhaust as the cats stopped it.

we checked the play in the shaft in the turbo and there was a bit, even put the boroscope in there to take a look. TBH, the car does use a bit of oil and there was oil in the intercooler when I had it off last week.

So not sure what the best option is now, I have a spare turbo but don't believe it to be any better than whats on there. Do I go recon or look for another turbo?

Any before anyone starts mentioning RS2 spec here, be advised.... I cant afford that right now

[AndyP]

Whe the seals on my turbo had gone the boost was leaking down the oil return line and into the sump. Try removing the oil reurn line and pressure testing it again, you should be able to hear the leak if there is one.

[prj]

Pressurize with proper pressure.
That smoke machine probably does like 2 psi if that.

You need to get at least 7-8 in there.

[gunman]

Pressurize with proper pressure.
That smoke machine probably does like 2 psi if that.

You need to get at least 7-8 in there.

It was tested at over 0.5bar.

[UrS4boy]

It was tested at over 0.5bar.

Meh. You are going to boost at least 1.2 Bar stock so test at that level. 0.5 bar proves nothing.

[gunman]

7 or 8 psi not going to tell much either then. I don't know what to do then, i tried a boost leak test myself and found nowt, the smoke test showed nothing so I am non the wiser and out of options .

[stocious]

did you test your gauge ? shot in the dark but i would test if mine!! would a blocked cat/cats do this also. MAYBE and im not sure on this but id also remove wastegate and check what pressure it open at with a compressor and regulator, watch it open/close and make sure its not sticking. if im wrong in any of what i said im sure someone will put right, just trying to help and good luck

[prj]

7 or 8 psi not going to tell much either then. I don't know what to do then, i tried a boost leak test myself and found nowt, the smoke test showed nothing so I am non the wiser and out of options .

How long did it hold 0.5 bar after you put it in?

[gunman]

How long did it hold 0.5 bar after you put it in?

It held pressure constanly as it was hooked to an air line, there's 2 gauges, one shows pressure and the other shows flow, there was a constant flow shown in order to maintain pressure. If we turned down the air supply the pressure dropped fairly quick (few secs).

[murat]

It held pressure constanly as it was hooked to an air line, there's 2 gauges, one shows pressure and the other shows flow, there was a constant flow shown in order to maintain pressure. If we turned down the air supply the pressure dropped fairly quick (few secs).

You have a leak then

[gunman]

You have a leak then

Yes, I know that, but I can't find it. We reckon'd that it could be leaking at the turbo seass, possibly into the exhaust or the oil returun.

[stocious]

pressure test it again, whole system and then in sections and surely that will show up where the pressure loss is occouring, if not at least youl know that its elsewhere. how did you test the IM? engine will always have a valve open, cant see logic in that ! or im missing something .

[gunman]

yes, there was loss but no smoke coming out anywhere so we assumes no leaks (externally anyway).

[murat]

try blocking turbo outlet. And pressurize it slowly, see if it holds without flow

[stocious]

and listen through filler cap/exhaust pipe.