So what is the definition of "working"? That the crankcase is going to go into vacuum WHILE under boost? NO. That will NOT happen as the External PCV DOESN'T mysteriously generate it's OWN source of Vacuum- it simply uses Intake Manifold Vacuum (when it is available) to perform a PCV function (under all conditions aside for "in boost"). So if Vacuum WHILE under boost is what you are solely looking for then keep on keeping on, this is not for you. And while you are thinking about it keep in mind that NOTHING will provide any vacuum WHILE under boost (at least of any significance) aside for a dedicated vac pump.
However the External PCV DOES work as INTENDED, let's summarize the intentions in a little Q and A:
1) Does it route the PCV vacuum source externally? Yes! This allows easy servicing and a visual on the components rather than guessing on what is going on and the state of health inside the valve cover.
2) Does it allow for use of OCC insertion into the low load PCV function? Yes! This allows for TONs of contaminates to be captured that would otherwise would be swallowed into the intake valves through the standard internal low load pcv tract.
3) Does it bypass the vulnerable Valve Cover and Valve cover gasket? Yes! These areas over time deteriorate, plastics crack, and is a big issue overall on this platform due to the largely internal and "plastic" design of the PCV system. Heat cycles are a large factor here and possibly some luck, but make no mistake as this is a real concern.
4) Does it mitigate issues by no longer exposing these vulnerable areas to High Boost and/or Vacuum attacks (once head is plugged)? Yes! No more worries of uncontrolled big boosting or heavy vacuuming into the crankcase/atmosphere (pending on where vulnerability lies) which can cause numerous issues.
5) Has it cleared smoking issues for many enthusiasts? Yes! Lot's of feedback on this concept even from a very early time.
We have sold many and continue to sell many of these kits over the course of nearly 2 years and those who have installed it and spent the time to study the PCV system could very easily agree that it works as intended. This all said IF your internal PCV system is working good AND you do not desire a catch can on the low side (where tremendous amounts of contaminates are caught) THEN there is no need for it. That IF is a wild assumption though, and if not now it will be eventually.
And once again IF you expect anything aside for a external vac pump to put your crankcase into vacuum WHEN in boost then you are not understanding the basic system functions whatsoever- and looking into an external crank vac setup (using a dedicated vac pump) is what you are going to need. The die hard type looking to go to that extreme we would certainly recommend going to the external PCV setup as well.
Thanks,
Rob