Hi, when I hold the revs about 3-4000 and then give it full throttle the boost only goes up to 0.5 like in safe mode. It does not go higher, then cut the boost - it just will not allow the car to go over 0.5bar. If i lift off straight away and then give full throttle then I get full boost back? Does it all the time?

Have cleaned out hoses but still doing it?

Any ideas please, as car is amazing apart from this issue?

thanks Ade - car is uk turbo 2000 1999 plate.