Thread: How to get PCV to work instead of valve cover breather!

Gtfo already ninja'd ya

Haha but I have picturezz

I just drilled a hole in my oil neck for now.

Originally Posted by dsmuts

I just drilled a hole in my oil neck for now.

If I could make it cleaner and had to drill into the lim like Anthony did though, I'd rather do it now before i put this all on so I don't have to take it all off again.

The LIM needs a hole drilled in the back right to line up with ZZP/WBS intercooler.

You can drill into the front side of the intake or the valve cover or the oil cap. It will be connect to the stock throttle body. Cap the nipple on back of gen 5, it is no longer connected.

Okay so it needs to be somewhere, the front or the rear is fine? And connect it to the tb?... Or one for each?

Look at the top left manifold. There are 2 holes under the "a" "n" in the word standard. That gets the rear PCV PCV to work.


You need a hole somewhere in the front. Valve cover / oil cap or drilled in sideways. Like you asked.

There at 2 holes hear as well. One is hard to see, but it is smaller and shinny.

Originally Posted by sseilmnop

There at 2 holes hear as well. One is hard to see, but it is smaller and shinny.

Okay I see them, now should I drill and tap where that picture is, (front left) or do I need to have it near the 'a' & 'n' holes?

ZZP/WBS effectively block the rear PCV hole on purpose so that no vacuum is put to crankcase if you don't buy there manifold.

This disables proper PCV operation but makes the installs easier for customers and ZZP.

Originally Posted by GrandPrix06GT

Okay I see them, now should I drill and tap where that picture is, (front left) or do I need to have it near the 'a' & 'n' holes?

The hole in the rear is a separate issue from the fitting in front.

The rear hole sucks (vacuum) air out of crankcase. You need to let air in so on the front you drill and tap a hole in valve cover/cap/ or in sideways into LIM. This lets the air into the crankcase. This hole in front connects with a hose to throttle body.

Okay, and the zzp/your core has the pcv hole in the rear to suck in correct? So I just tap in the front and connect to throttle body correct? Lol like in Anthonys picture..

Yes like Anthony's picture


Or from the bottom of #1 post

"**Note for L32 throttle bodies**
You do not need to drill the throttle body. Cap nipple on back of Gen 5 supercharger pointing straight up (it won't pass through Intercooler) and connect that hose instead to front valve cover. The stock l32 manifold will need the 1/4 hole drilled in back. You will not have to do anything to throttle body. PCV will be fully functional."

And it's to relieve all the pressure pretty much in the crankcase like you are saying. So since the rear pcv is functioning and sacking the air in, I tape the front n run it to the tb to relieve it. If I'm understanding..

Okay I gotcha, the front post says tap 1/4 to the rear, and Anthonys is in front, so that was confusing me..

Ok guys for those that can help I have a gen v sc, zzp gen 3 ic modified for gen v, ported lim for ic and N* setup with evap and egr.

my question here is the rear and front pcv are blocked off by the ic. I may be able to get the rear pcv to function by modding the ic. But here is where I am confused.

Some say to just block off both and run a breather but that makes me wonder how will the rear function if I do a breather in the front valve cover?

Also I want pcv to work due to emission so breather I want as a last resort.

So my question here is if I get the rear to function what dp I do about the front.

Tap into the oil neck of the valve cover run a hose to the same place I am running the rear pcv?

Between the tb blade and after the maf? Both front and rear?

Hope you guys can help will be doing this later today off work.

Originally Posted by GTP89

Ok guys for those that can help I have a gen v sc, zzp gen 3 ic modified for gen v, ported lim for ic and N* setup with evap and egr.

my question here is the rear and front pcv are blocked off by the ic. I may be able to get the rear pcv to function by modding the ic. But here is where I am confused.

Some say to just block off both and run a breather but that makes me wonder how will the rear function if I do a breather in the front valve cover?

Also I want pcv to work due to emission so breather I want as a last resort.

So my question here is if I get the rear to function what dp I do about the front.

Tap into the oil neck of the valve cover run a hose to the same place I am running the rear pcv?

Between the tb blade and after the maf? Both front and rear?

Hope you guys can help will be doing this later today off work.

The zzp LIM manifolds are drilled in the back to get the rear PCV to work. You should be able to located and drill the hole near the original stock hole in your manifold if your not running a ZZP LIM.

If you don't want a breather connect the front valve cover to the N* as the instructions show. Picture in first post should show this.

Ok but the rear keep it hooked up to my tb as I had prior to installing the ic correct?

Also that picture you mentioned is the only one not showing.

Thanks for the quick reply by the way.

So should I just tap into the neck up front and route it to the same connection on the tb as the rear one correct?

That way I have both front and rear working.

Once you drill the LIM, the rear PCV is all internal in supercharger. The intercooler blocks the front PCV. The nipple on the back of gen 5 pointing up is actually part of the (blocked) front PCV.
With a intercooler installed it is blocked from making the connection to the front PCV hole.

Connect front valve cover or oil fill extension to the TB. Cap the nipple on the back of the gen 5 supercharger.

Awesome I did not know that. You are awesome man thanks I really appreciate it this has been holding back my build alot

Do you recommend running a catch can setup?

I have one they gave me. With a filter on top of the can. And it has two hoses on it.