I'm not a physics expert so I need abit of clarification please.

Ok we all know that in so called "vaccum" or the natural sucking action of af an engine the engine is sucking in the air it needs to operate. We also know that when a turbo adds pressure to the intake tract that in "Boost" the turbos are over taking the natural sucking action of the engine and forces air into the engine.

Now what happens at the exact point that neither the engine is sucking in air or the turbos overtaking the sucking action to provide boost? I believe this would be at " 0 " on the boost guage. Will this cause the engine to act weird if in this state to long or does it still get the air it needs to operate? Just curious on how this works out.

 

No because the car needs air to run, and the turbos are feeding it that. 0 vac does not mean no air

 

Think of the engine as a vacuum pump, it is always trying to suck in air when it is running but the throttle plates are restricting the flow causing a vacuum in the manifold. Now as you open the throttle you are decreasing the restriction lowering the vacuum untill the engine is getting all the air it can pump, your still moving air but there is no restriction to make a vacuum and your gauge will read zero. With a turbo charged engine at some point you'll make positive pressure or Boost.

 

Done and Done! That really helped out alot.

For some reason a friend of mine told me that when an N/A engine was sucking in air it kept going further into vaccum. Thats why I was like this . Then I thought for a turbo engine thats going to suck when it reaches 0 then... no air.

Cool deal!

 

Tell your friend to study a diesel engine. It will never "show vacuum" due to the unrestricted intake plenum, i.e. no "throttle", yet it is obviously sucking air. Diesel engines have to have a separate belt/engine driven vacuum pump if vacuum is required for things like brake boosters.