Hi i own a 04 plate fabia vrs i was boosting around 1.6 bar but its started to fall down when getting higher in revs? I have a crack in my exhaust manifold which i noticed yesterday could this be the problem?

Boost isnt flat across the rev range. Its more of a curve so will fall the higher up the rev range.

Edited 7 October, 201213 yr by faboka vrs

But its hardly boosting at all now only gets to 1 bar if im lucky :(

Cracked manifold won't be helping anything.

Yeh i guessed that but it looks like its bin cracked a while must hav got bigger haha iv checked all my boost hoses so theres no problem there im going to fit a fmic soon.

Have you logged group 11 in vcds?

Yeah download vcds lite and an ebay cable, the cracked mani will be source of your problem.