Just rebuilt engine having boost controller issues! Help!


Registered User
HELP! Just finished my k04 build. Having weird one with my vaccum boost pipes.
Following the elsa and online diagrams for the boost controller.
When the boost controller is connected up correctly I get rubbish/0 boost. Correct me if wrong
Bottom of T connected to Turbo charged pressure.
Top Left to ambient
Top Right to wastegate.

However if i pipe it up differently it goes like stink.
when I disconnect the charger pressure vac pipe and leave it loose and then plug the waste gate vacc pipe onto the bottom of the T ( charged pressure outlet) I get crazy boost.
Previous owner had it plugged like this which is real weird as it's totally different to diagrams
Could boost controller be faulty itself?