PCV bypass

lj909

Oh that's a good idea to vent on the ground but if part of your system is still hooked up then your sucking unmeasured air and messing with your a/r ratio. Also if your still sucking from the pvc then your not getting the little benefit.

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PW 07 HR350Z R.I.P. Totaled by 82yr old woman
2010 40th Anniversary 370Z

synolimit

I know a subi is different but I used to vent to the ground also (very illegal for a track!!). Then I started getting faster in high G corners and was dumping all my oil out the valve cover breathers. My car was soaked in oil!!! That's why they have to run a catch and return system. But instead of hooking it up oem style to the mani where the motor will burn it up lowering HP, AFR, oil level, we hooked the return to the crank case breather so whatever got spit out went back in to a safer/better place. Not sure if its a Z problem but someone who can fuel starve in high G right handers would need to confirm yes or no.

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13 370z-

L33T Z34

Let me modify page EC-509 of the '09 service manual to show you how I do it. Where the red x's are I placed K&N crank case breathers on the valve covers. This dumps to the ground/atmosphere. Where the red x's are on the intake (accordion tubes) I placed pipe plugs to seal the holes, no vacuum leaks. I do not remove the PCV valves or the hoses off of these to the intake manny. I simply do not want blow by gasses being dumped into my intake before the TBs during "full throttle" conditions. As LJ stated, this keeps the intake air CLEAN and COOLER, thus subsiding detonation.

Attached Images

PCV Diagram Anno.jpg (202.1 KB, 110 views)

synolimit

So I just took all my catch can and stuff apart (had a leak). I've noticed my hoses on the front of the mani coming from the catch can now have oil in them. But that's impossible because my catch can doesn't allow this! So I'm assuming the oil is not coming from the catch can/PCV valves, but from the inside of the manifold since my Z1 post tubes still are hooked up normal to the valve covers?

I'm not doing a dump to atmos when I have a proper CC! But I'm not sure I feel comfortable blocking off the post tube port and the valve cover head. Its gotta be there for a reason.

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13 370z-