What is this???

[bcdesigns]

Help me!
This is normal? I had seen engine's photos that have there a tube conected... What this do???




Weird

[auditude]

Re: What is this???

That is normal on a 20vt car. On the earlier 10vt, the wastegate frequency valve is connected to that. On 10vt's, the boost control applies modulated boost pressure to the upper chamber to counteract unregulated boost pressure on the lower chamber. On the 20vt's, the boost control limits pressure to the bottom chamber with the wastegate frequency valve (WGFV).

[Ski]

my m8 have a 10 valve turbo audi and his dotn go no where either..

the dumpvalve has no where for this non existant pipe to attach too either... weired.. (im presuming the above says that this mysterious valve should go into the dumpvalve?)

[Beetie]

This is normal, S2's turbos recirculate, rather than dump to atmosphere

[Ski]

pure efficiency

[91_S2]

Help me!
This is normal? I had seen engine's photos that have there a tube conected... What this do???




Weird

Dude,

That is normal. It simply leaves the upper chamber of the waste gate open to atmospheric pressure. I think some boost regulators like Apexi and HKS use that to put pressure into the upper chamber to prevent waste gate creep.