A2Steve
A2OC Donor
Since increasing the turbo pressure on my FSI I’ve been having quite loud churping from back pressure when the throttle is closed. Not a bad sound at all, but certainly not doing the turbo any good.
The planned and fitted fix was a Blow off valve or “dump valve”. Fitting has gone fine and has eliminated the back pressure.
Now to my question. The dump valve relies on vacuum pressure and boost pressure to open and so I’ve take a vacuum feed from the upper inlet manifold. This vacuum pressure is too great. It’s opening the dump valve at relatively low pressures and so I need a vacuum source on the FSI that’s going to be at a lower pressure.
Can anyone with some knowledge of the FSI think of a source of vacuum after the throttle body?
The planned and fitted fix was a Blow off valve or “dump valve”. Fitting has gone fine and has eliminated the back pressure.
Now to my question. The dump valve relies on vacuum pressure and boost pressure to open and so I’ve take a vacuum feed from the upper inlet manifold. This vacuum pressure is too great. It’s opening the dump valve at relatively low pressures and so I need a vacuum source on the FSI that’s going to be at a lower pressure.
Can anyone with some knowledge of the FSI think of a source of vacuum after the throttle body?