Wgfv disconnected but still get 1.5 bar boost

[andyg plym]

So been laid up all week with chicken pox and sat pondering about the car and its niggles etc

Still not getting 2 bar boost as I should, been thinking fuel pump related as that's one of the last things I've yet to upgrade.

Anyway, went out tonight and thought I'd disconnect the wgfv to see what mechanical boost I was getting, expecting 0.4 bar it still boosts to the same @ 1.5 bar.

Only time I've heard of this I'd when the wgfv has been bypassed with a crappy bleed valve !

Anyone had this before ?

[AndyP]

Take the wastegate cap off and see what spring you have in there.

[andyg plym]

Standard mate I've recently seen it

[Acidburn]

could be a leak around the wgfv, what are the hoses like?

[AndyP]

Standard mate I've recently seen it

Did you check the diaphram too?

[andyg plym]

Yes all new vacuum pipes boost leak tested a while ago (only to approx 1 bar as we found a leak elsewhere !)

Diaphragm on inspection seems fine, the wg was off when I pulled the engine a few months ago and all appeared to be working, freely moving etc

The cars done approx 90k

[driftin jo]

When the WGFV's fail they normally fail open so you get mechanical boost, they have been know in rare circumstances to fail closed or partly closed, which could explain what is happening.

The only way to be sure is try another WGFV, is the someone near you you can borrow one from to test.

[prj]

His is probably just plugged in the wrong way round.

Try running direct hose from turbo to wastegate to confirm.

[andyg plym]

@prj who is exactly is "his" ?

If you are referring to me I can assure its plumbed in correctly, after 9 years and 10 s2's you sort of remember

[prj]

Well, just run a direct line to the wastegate to check...
If indeed everything is correct and nothing is leaking then the n75 should be stuck in some intermediate position.

[AndyP]

Try putting 12v to the WGFV terminals or use VCDS output test if you have it. If it works you'll hear it clicking, if it's seized you won't.

[Rusty]

Well, just run a direct line to the wastegate to check...