Boost control actuator on twins

Started by Jono FD3, March 05, 2010, 09:42:02 PM

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Jono FD3

Can anyone tell me if the boost control actuator (right at the bottom of the twin turbo pack) is opperated by vacume or pressure??
The reason I ask is I think this is my problem area with my over-boosting but not sure if the pipe is colapsing under vacume!!

Cheers
Jono