Lost Boost HELP lol any idea

[warmup.me.uk]

sorry i have not been on for a long time had to move my website to a new URL because of a PLC thought i was using there name load of hassle.

 

I have a problem my car last night lost all boost and the exhaust has increased in volume don't quite know that the problem is checked most of the things today this is the list i have done so fare.

 

checked all hard piping and flexy pipes from turbo to inter-cooler and inlet manifold no leaks anywhere.

checked all vacuum pipes all in place no leaks.

The car does have an HKS boost controller which controls the boost on the first turbo also the turbo pressure sensor in the inlet manifold and the pressure sensor in the fuel rail. The boost controller under the bonnet makes a chirping sound every few seconds when i first lost boost the controller stop making a noise traced the wires back and cleaned the earth strap and positive connector the controller makes a sound again.

i am now getting some boost when you boot it it will boost to 0.5bar then very quickly drops back to atmospheric pressure.

There is still one cat whether that being faulty would cause the problem not i have had a few problems with turbo diesels loosing boost when the cat as had a problem.

I am a bit lost where to go now i option i can see is to remove all the HKS system and re wire and pipe the car back to standard which prove whether the HKS is to blame or that there is a fault on the engine side.

 

 

please help!!!!!!!!!!!!!!!!!!!!!