Boost troubles sw20

[FXGTV]

About 5 days ago my sw20 sounded like it was sucking in waaay more air when i hit boost - as the days went on the rushing air sound was accompanied by a decrease in overall boost performance.
Now boost hardly comes on, if only in small, shuddering bursts (almost how the turbo/engine behaves when the computer is in overboost engine saving mode, but that is usually a simple fix of turning the engine off and on again).

My first thought was vacume leak - but i have yet to have found one. Im not super knowledgable when it comes to cars - whats the best way to check for a leak? Where should I check? What else could this possibly be?

Thanks in advance

[MR2SIK]

has the orange warning light some up on your dash?
Sounds like what mine did when I broke the knock sensor,
Ecu Pulled back the timing, put your foot down, get lots of intake noise but no power.

[flygt4]

might pay to pull off the intake and see if the compressor wheel is spinning freely too.
when i spun the bearings on my old turbo there was enough play the wheel would occasionaly stall against the side of the housing.

extra induction noise/hissing could have been a faulty wastegate actuator allowing too high a boost level and overspun the turbo.
are you using an aftermarket boost gauges and if so was it reading above normal levels?

[Skin]

*cough* I got a ct20b for cheap *cough*

[FXGTV]

Hahaha Skin, i may be keen for that Give me a pm with the details.
I think ive located the problem - the massive hose going into the intake has a split in it. I'll replace it tomorrow and see if that fixes it.

[Bling]

I think ive located the problem - the massive hose going into the intake has a split in it. I'll replace it tomorrow and see if that fixes it.

that will cause it

happened on my old mans diesel pathfinder.... no extra noise, just more and more and MORE black smoke pouring out the back and less and less power...... intake pipe have a massive gash in it!