hi, can someone tell me the standard boost for a astra coupe turbo ie Z20LET. my mate has just bought one and we fitted a dump valve to it but it aint very loud(the instructions from regal say to leave on the standard recirc valve). is this the normal thing to do? i have mine disconnected on my LET.he decided to remove the underbonnet sound deadening material which helped but its not great. i was thinkin its maybe just cause its standard and not at a great deal of boost.
I also noticed that when he revs his engine at a stand still his boost pipe to the plenum expands lots showing obviously that its boosting. i tried on my car(basicaly the same pipes regarding thickness and softness) and mine never budged at all. could my turbo be on it way to turbo heaven?? it seems to boost ok on the gauge, if maybe at slighty higher revs than my mates coupe but nuthin at a standstill. have i got problems??