You have 2 choices.

The easiest is just to plug the end. If you do this make sure its a tight fit.

The other is to remove the top of the standard Recirculating Dump Valve and put in a spacer then replace the top. This stops it from operating.

 

what would happen if it wasnt a tight fit.

 

It'd probably leak.

 

here's one for you

on mine, the end of the pipe coming out of the turbo was plugged. One day I noticed the whole thing had dissappeared - must have got caught when I took out the radiator - anyway, didn't make a difference

why not

 

is it possible to have no boost at all if the internal dump valve was not closed of.

 

you'd still get boost, as I had plenty - could hit 17psi on over boost.

 

any ideas why i am not getting any boost.

 

my mate wasn't getting any boost. Initially thought it was the actuator - but it wasn't. Took the turbo off to send it away - his wastegate fell down the exhaust pipe - that was the problem.

 

im new to turbos is the wastegate the door which opens and closes how did it fall i presume that has nothing to do with the turbo.

 

waste gate is part of the turbo. It is connected to the arm that your actuator moves.

My mates had once seized, and been gash repaired by previous owner. It worked fopr a wee while. When we took the turbo off, the movement obviously just finished it off.

 

how do i check if it is seized and if it is the wastegate does that mean the turbo has to rebuilt what exactly is involved.

 

Tabs,
looking at the engine from the front of the car you'll see the actuator rod is connected at the right hand side end to a little arm that is in the manifold, to check if it is siezed undo the right hand retaining nut and see if the arm will move anti-clockwise (mark where the left hand nut is as the tension on this bar is how the boost is adjusted), if it don't it might be siezed. The wastegate is simply a disk on the end of this little arm that opens and closes when the actuator tells it, when its open exhaust gases go around the turbo rather than drive the turbines, its quite common for the disk to come off and go down the exhaust (as mine did and smashed the fog light on my wifes astra as it came out). If there's no wastegate there will be no boost. easy to tell if the gates gone cos the arm will rest at 6 o'clock if it's there (turning clockwise) and will move to about 8 o'clock if the gates broken.
The wastegate is physically part of the manifold not the turbo, but the turbo needs it to operate properly and is a £50 DIY job to fix. so don't panic if yours is fooked.
Lee.