I may have asked before, but I still don't have a good solution.

My boosted VQ35 is currently running with the crankcase vented to the atmosphere.

It would be beneficial (I think) to keep the crankcase under vacuum, or at least be able to capture and burn the "fumes" from the crankcase.

All of the solutions I have read about assume the MAF is before the blower, and also allows the "dirty" air from the crankcase (with oil) to get sucked through the blower. I have the MAF after the blower, and would like to avoid pulling oil through it.

Are there any good solutions to this problem? I tried to draw something out using check valves and lots of splits, but after analyzing the solutions they all seem to fail in one of the modes (boost VS non boost).

Thanks

 

On my DEK there is a vacuum line going from the crank case straight back up into the upper intake manifold. To avoid the oil getting burned again I installed at first a homedepot catchcan and recently upgraded to an eBay one. I would imagine it to be similar on the VQ35 and that the pcv is not actually going back into the actual intake piping etc.

 

If you want to try and separate the oil from the blow by gasses, have a look at this. You will need something to catch the oil in. McMaster-Carr has aluminum bottles for pretty cheap (p/n 6810T53). Alternatively you could cut some 1/4 npt threads in the lid of one of those aluminum water bottles.

 

notice the aluminum can on the right edge of the bay

 

If you run the pcv as designed you'll be running boost through your crankcase, not ideal IMO, run the front and rear valve cover vents to a catch can and vent to atmosphere from there

 

I realize most people vent to atmosphere- That is what I have now. I would rather have some form of PVC in place.

Sounds like if I hook the PCV hose (one? or both?) to a catch can (I have one already), then in to the intake on the blower that may accomplish what I need? I doubt it will be as effective as the standard PCV system (pulling air through the crankcase after the TB), but it would be better than nothing.

 

If your going to use the PCV system, you have to purchase a valve, so when you go into boost it does not leak into the crank case.

 

Yes, I realize I need a check valve (or 2).. But still have not figured out how it all gets hooked up so it works properly in all running conditions.

 

This is the way I have mine hooked up and haven't had any issues. All you are doing is intercepting the air that would go from the valve covers via pcv back into the intake manifold. You create vacuum for the catch by attaching the correct hose to the intake on the blower. Both covers are connected by a hose so the one at the pcv goes into the can, the hose going out of the can goes to the intake manifold. The large hose that usually goes to the stock midpipe is what you connect to the blower/turbo intake.

 

Anyone have any good pics of their vacuum , pcv and breather setups . I'm following the stillen s/c instructions for my install . But I don't plan on using the stillen bov or re circulating the bov air back to the intake.

For example if you put the pcv to the atmosphere, what do it I do with the port on the intake mani that used to feed it..

I also want to avoid stalling issues when coming off boost as much as possible .