Originally Posted by SPOHN (Post 2374879)

After discussions with Sam at GTM there is absolutely nothing wrong with putting filters on the intake side and leaving the others side completely vented to atmosphere and using no catch can at all. That's my plan. Maybe put filters on them so nothing can go in the holes.

Originally Posted by Kingbaby (Post 2374559)

Yea...I capped off the bridge on the crankcase, and the one on the driver side. Keep the one on the passenger side going to the back of the intake manifold.

thought?

EDIT:

I'm NA

Originally Posted by Sh0velMan (Post 2374722)

Air doesn't blow out of the outlet though, you have to put vacuum on it to draw it out.

That's why I said you'll run lean unless you plan on installing an electric vacuum pump to evacuate the crankcase.

I've tested this on my own car and confirmed that without vacuum on the PCV outlet, no air passes through the crankcase (other than blowby).

Originally Posted by wstar (Post 2374853)

Running breathers on the intake side as pictured is fine, IMHO. It's really not much functional difference from the stock configuration where the intake air filters play the role of that breather (and as a bonus - sometimes there is flow reversal and/or backfire through that line - at least that won't be going into your intake). But on the other side, you should hook up vacuum through a catch can. This will actively draw negative pressure on the crankcase and keep fresh air coming in through the breathers to replace it. If you were to vent the catch can to air and cap off the vacuum, the catch can won't really do anything (you might as well be venting both sides to air as above).

Originally Posted by synolimit (Post 2379909)

The yaw sensor has no bearing on drag racing correct? Must be a lateral force yes?

Originally Posted by synolimit (Post 2379845)

I've never known a race track that will allow this during tech inspection. If the motor blows oil has a direct line out of the motor and onto the track and your headers. I've only known OEM setups with a catch can not vented to atmos to be legal. If the motor goes everything's contained and will run through the motor and crop dust everyone as you blow smoke out the tail pipe. At least then the oils had a chance to burn up a little. Yes throwing a rod out the block will contain no oil but that's if it happens and un-foreseeable. Yes I also know that's not the normal flow of air when hooked up but a blown motor can change the dynamics of the flow. I personally wouldn't run anything to atmos on the track. On the street I do.




Pic?





On other cars I've let it just come out if it needed to; vented to atmos, never had issues. I do think you'd run lean though "if" it were still attached to the manifold because it'd be drawing in unmetered air.



Except the MAF sensor already accounted for the air brought in through the real air filters. That's not fine as pictured because the manifold will now bring in air into the motor from two (4 total) different locations. One metered, one not. Only way it will work is a 100% capped off system letting the pcv's just open from pressure building up behind them, or OEM with a OCC. as stated though, Its not track legal to just let crank pressure blow out to atmos. Oil on the track or headers if the motor goes = burned alive.

Originally Posted by Sh0velMan (Post 2380032)

Yes, but disconnecting or disabling the sensor will disable VDC completely, and cripple the non-LSD cars even more.

Originally Posted by Sh0velMan (Post 2380046)

I just want to say one last time that if you put breather filters on all four PCV connections, you will have no more positive crankcase ventilation.

Your crankcase will be ventilated, of course, and any pressure build up due to blow by will be relieved, but fuel and water vapor will condense inside your crankcase every time the engine cools and nothing will forcibly remove those vapors while the engine is warming up. PCV exists for reasons other than just emissions, it keeps potentially corrosive vapors from collecting inside your crankcase.

Sam is absolutely correct that it will not hurt anything short term, but think about what is going on inside there over the course of a year or more. Water and gasoline sitting on parts that were never meant to have water and gasoline sitting on them.

I just really think it's foolish to do the "elimination" when you gain absolutely nothing by doing it and cause a vulnerability in the process. Last I'll say on it, I promise.

:tup:

Originally Posted by Sh0velMan (Post 2380046)

I just want to say one last time that if you put breather filters on all four PCV connections, you will have no more positive crankcase ventilation.

Your crankcase will be ventilated, of course, and any pressure build up due to blow by will be relieved, but fuel and water vapor will condense inside your crankcase every time the engine cools and nothing will forcibly remove those vapors while the engine is warming up. PCV exists for reasons other than just emissions, it keeps potentially corrosive vapors from collecting inside your crankcase.

Sam is absolutely correct that it will not hurt anything short term, but think about what is going on inside there over the course of a year or more. Water and gasoline sitting on parts that were never meant to have water and gasoline sitting on them.

I just really think it's foolish to do the "elimination" when you gain absolutely nothing by doing it and cause a vulnerability in the process. Last I'll say on it, I promise.

:tup:

Originally Posted by Red__Zed (Post 2380572)

With FI it's probably smarter to eliminate it than to leave it. You're looking at a very different engine ecosystem with boost.