OK.. heres my question..

normal cars at idle have some source of vacuum. when under throttle.. vacuum lessens.

so.. when you add a turbo to the engine, a source of pressure is introduced, and now you don't have as much vacuum present.

my question.. what do you do about vacuum controlled instruments (hvac) and brake system? dont they work off vacuum, and now your adding pressure?

this question ponders myself and co-workers...

 

late night bump...

 

when the gasvalve is closed you have vacuum so when not onder throttle there wil be no boost and there is vacuum...quiet simple i think.
with a jrsc it's a little diffirent there the boost is after the gasvalve but a bypass leave's the boost go round in youre manifold through the blower back in to the manifold again, the pistons are stil under vacuum so you dont have any probleem with the brake system.
i'm running a jrsc but still have a problem with idle and when of throttle the rpm's seem too hang for a few second's....where it comes from ....i really don't know