This! as I said, keeps climbing fine at 2000 rpm or slightly below...
Intake/turbo definitely coming off...
Fished from another forum:
"ive got the intercooler prob also. its got a leak and does what youre saying at around 3000rpm (where it hits about 0.5bar). before it would be at 0.9bar at 3000rpm, but not it gets there and just dies, constant 0.5bar reading, and no power at all. with all the windows open i can hear the leaking of air, and the bov also sounds slightly different in a funny kinda way. but yeh, im got boost leak, which if i were to describe would sound very similar to what you are saying..
something that could help, if i dont have the accelerator down quite as much, it will tend to act 'normal' again, and continue to rev through the range until it is creating too much boost, then i ease of the accel a bit more and it will continue to rev another 500rpm til doing the same thing.
as long as i dont create too much boost (in which case air would be leaking while too much fuel is being put in.. im guessing..) and keep it around 0.3bar by lifting off the accel when it gets too much, it will keep on reving. easy to do between 2000 and 3500rpm, but the higher the rpm's, the easier it is to create boost and more precise i need to be with the accel pedal as to not give it too much exhaust gases to spin the turbo thus create boost.
i hope this dribble helps somehow
just sharing my expreience..