boost problem

[J.j.]

Hi guys,
Got my boost gauge fitted today.
Now, the bad news.  I knew my second turbo wasn\'t working, but there seems to be problem with my primary turbo as well.  I was testing boost level in second and third gear.  When I reved it to 3/4 k, the boost gauge only showed 0.2 bar.......  


:confused:  :confused:   :confused:  :confused:  :confused:

[rx jamie]

any hissing noises ? might say if you have a leak?

[J.j.]

Hissing sound??
Leak?
We did find some oil in the intake, but very very little.

Cheers

[James S]

i take it you\'ve checked your vacuum hoses are all connected and none are split  :confused:

:wave

[J.j.]

Not sure if we\'ve checked all of them.....   But as far as I know, there\'s no splits, loose or anything........

     

[James S]

maybe its an ecu problem you\'re best bet is probably to get it checked over by a specialist, they will be able to diagnose the problem pretty quick.

[J.j.]

Thanks James.  Will do.

[jameswrx]

same as I had, was a vacum hose off.  It was located under the inlet manifold (looking from the front), you need to remove the black plastic box in front of the inlet (2 x 10mm nuts and slip off the 2 vacum hoses) to have a good look under the front of the manifold.  have a look at my thread further down the page (boost problem one)

[jonrx7uk]

What rpm is the idle when warm?  A high one could indicate a vac hose problem under the Intake manifold.  If all is okay, listen for hissing under power (hard to do i know...)

jon

[J.j.]

Right, dont think I\'ll have time to pop down to a garage today.  No tools with me either, so probably will have to wait til weekend.
No, the idling\'s good.  Hissing sound under power.....  Not a easy one is it......
Anyway, well let you guys know if I get it sorted.
Thanks

[Spotlamp]

If you\'re not making boost on the primary then it\'s extremely unlikely to be a vacuum line problem.  Without 10psi on the primary you\'ll never get the secondary to spool period.

It\'s probably a leek on the main pipework from the turbos to the intercooler and then to the intake manifold.  If you\'ve got a coupler that\'s off completely then you wouldn\'t make 0.2bar, it sounds like a split.  Check all the rubber couplers thoroughly, the most likely culprit (unless you\'re running an efini y-pipe) is the rubber coupler that comes off the top of the turbo housing.

HTH
H

[cruiser]

Did you drive the car or did you rev the engine in neutral?
0.2bar is what you get if you rev it in neutral.

[J.j.]

No, 0.2 is driving.  dont even get 0 when in neutral.
My y pipe\'s the metal one.

Cheers

p.s.  Is not dangerous driving like this or is it?

[jameswrx]

If you\'re not making boost on the primary then it\'s extremely unlikely to be a vacuum line problem. Without 10psi on the primary you\'ll never get the secondary to spool period.

As I said I had 0.2bar through the revs and it was a vacum pipe off.

[cruiser]

Yes, you can overspin your turbos driving like this if you want to boost. Did you check all your couplers ? What about the connection from the Y-pipe to the blow-off valve ?