Is keeping the pcv valve recommended under boost, should the pass side be left hooked up to the TB or just get a breather?

 

On mine, I put a breather on the passenger side and left the PCV valve hooked up the way it came stock.

 

Thats how Im hooked up, you blowing out oil anywhere?

 

You may need a check valve inline with the PCV valve. This is to keep boost out of the crankcase. Some (most) PCV valves will leak some when under boost pressure.

RBob.

 

Get a breather....

 

Im not leaking just thought I might need a breather on the pcv valve side.
I think the check valve is a good idea as well, I have seen setups with either or.
Which inline check valves would work, Im only finding regular valves.
Thank you

 

I've seen brake booster check valves used in the PCV line. Although I'm not sure whether they would hold up to the oil or not. Although oil isn't nearly as bad as fuel, so they may be OK.

For valves with viton seals check this page:

http://www.usplastic.com/catalog/ite...3369&catid=489

Use the 3/8" or 5/16" ones for PCV and CCP. And the 1/8" ones to keep boost out of other areas. Such as the EGR, cruise, AIR solenoids, and ??.

RBob.

 

I may try to go back to a PCV system on my setup. Right now I have both valve covers vented into a catch can with breather on the can. I dont think its working as well as it should. Had some oil come out of the valve cover grommets but I'm not using baffles which could be the problem.

Stock PCV valve I could easily blow air thru it with my own breath, let alone 15+ psi of pressure. So I scrapped the PCV idea for now, but would like to investigate it further. Just need a strong one way valve and maybe a filter inline so i do NOT suck in oil thru the motor.

 

If you had a cheap 2-bar map sensor on it you could tap in different areas to see how well it is working. If the map takes in a fair amount of oil then it may be destroyed or may just need to be cleaned out.
I tried one on a log manifold to record EBP and it only lasted less than 50 hours. Water/alky and condensation in general destroyed it, but it worked long enough to record the EBP via the ECM to compare against intake PSI, TPS, etc.

 

With my 9 psi setup I'm not seeing any significant problems with oil coming out. Certainly on the passenger side breather, there is no oil. There is a slight filming of oil on the valve cover around the filler cap that builds up over time. That's using a standard PCV valve. Perhaps you could use two PCV valves - one of those in-line types and then the stock PCV that goes into the valve cover grommet. What little bit of pressure leaks past the in-line would then be more easily stopped by the second PCV.

 

On my buddy's turbo Chevelle (blow-through carb system) we used Mopar-style breathers in both valve covers (that have hose nippes on the top) and then ran hoses from the beathers over to a catch can. Works flawlessly.

Never tried it with a PCV system, but if we ever did we would certainly look for some kind of one-way valve to put in the line. A standard PCV valve will DEFIN ITELY allow considerable back-flow into the engine. Just blow through one in the same direction that boost would be trying to go and you'll see what I mean.

And if it's a blow-through carbureted setup it would be air and fuel back-flowing into the crankcase. That risk didn't seem like a good idea to us which is why we went with dual breathers and a catch-can.

 

Thats not a bad idea to try... I do have the extra knock sensor port i can put a vacuum nipple fitting on it. Just wonder if I can read both maps in the ecm? Code $59 does have 2 bar and 3 bar options I believe but not sure if its simultaneous or not.

 

Most OEM's put the outlet of the PCV breather into the inlet of the turbo so it can be sucked through. I personally dont like the idea from a performance standpoint due to the heat and potential detonation issues.

 

Can you do a filter in line to catch any oil?

problem with my car is at the track I do not run air filters so i no longer would have that vacuum source. Maybe its time for a pump.