solenoids

My Seat has been off the road for almost 3 years and it's just had a cylinder head and head gasket repair which had no problems from the engine after it was done. A couple of weeks ago I was driving it and the rev meter was taking maybe a couple of seconds to get to 1500rpm then the turbo...

Hi, I am just after a bit of info on the stock engine management, does it use solenoids or bleed off air to control the boost? If it bleeds air to control the boost, does anyone use electronic boost controllers to improve boost control?