What’s this valve?

ex911driver

Registered User
Sorry , another question, on the top/rear of engine , with cover off there is a valve with vacuum pipe going onto it, On the bottom there is a pipe missing, where does it connect to? Thanks
 

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gary3306

Registered User
VCDS Map User
Gold Supporter
Looks like a dump valve
 

gary3306

Registered User
VCDS Map User
Gold Supporter
There should be an outlet pipe on the bottom, a pipe going to the turbo intake and the vacuum pipe on the top
 

gary3306

Registered User
VCDS Map User
Gold Supporter
The pipe on the bottom should go to your air intake pipework after the air filter. There's two types of BOV. This one is a recirculating type as it blows off back into the air intake. There are atmospheric ones that blow off into (as the name suggests) the atmosphere. These are the ones that the boy racers have fitted that make the stupid noise when they come off the throttle
 

Gnasher

Registered User
Now I'm not saying anyone is 100% wrong here but do the 2 pipes go the other way round to as described in the posts above?

As in...

Top pipe (thin one) - vacuum line to intake manifold (or solenoids etc).
Bottom pipe (your missing one) - to inlet pipework after the turbo.
Middle pipe (one you can see to the left on the photos) - to inlet pipework before turbo/airbox.

Whenever I've seen dump valves before the pressure side of the connections is normally opposite the vacuum line as it's this pressure differential that dumps the boost. Only mentioning as it'll not do the engine much good connected the wrong way round.
 
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