Surprising results for such a little mod. Not only does the engine rev smoother, but there is more low end torque. There is probably more high end torque too but I can't tell when the turbo kicks in.
Gutted PCV Valve
igs
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shabby, what's the problem with gutting a pcv valve?
i assume igs put on a breather filter and capped off the intake manifold nipple, if you were thinking he didn't.
igs, please tell me you did
i assume igs put on a breather filter and capped off the intake manifold nipple, if you were thinking he didn't.
igs, please tell me you did
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http://www.dsmtalk.com/forums/showthread.php?s=&threadid=27056&highlight=pcv0Jiggy0 said:who even gave u this idea
A stock pcv valve is closed under boost, so it doesnt allow any pressure to get inside the head(its connected to the intake manifold). In no boost situations its open to vent any crackcase pressure into the intake manifold.
Now since your's is fully gutted, once you build boost you have a) a huge boost leak and b) your filling your head/crackcase with pressure.
Assuming you disconnected the vacuum hose to the pcv valve then its fine, but since you didnt say that i went all bonkers on you
Now since your's is fully gutted, once you build boost you have a) a huge boost leak and b) your filling your head/crackcase with pressure.
Assuming you disconnected the vacuum hose to the pcv valve then its fine, but since you didnt say that i went all bonkers on you
In no boost situations the valve is only slightly open. Blow through it and you will see what I mean. Gutted, it can flow freely and vent considerably more crankcase pressure.shabby said:A stock pcv valve is closed under boost, so it doesnt allow any pressure to get inside the head(its connected to the intake manifold). In no boost situations its open to vent any crackcase pressure into the intake manifold.
Now since your's is fully gutted, once you build boost you have a) a huge boost leak and b) your filling your head/crackcase with pressure.
Assuming you disconnected the vacuum hose to the pcv valve then its fine, but since you didnt say that i went all bonkers on you
Yes, my intake manifold is plugged.
Well then what about the crankcase breather hose? It vents from practically the same place (doesn't it?) and is always open. Taboo says that the PCV hole and crankcase breather hole are nothing more than two openings in the valve cover. RRE also recommends removing the PCV valve and replacing it with a straight fitting.shabby said:
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Could you post a picture of what you have done?
i've seen alota guys get a straight fitting from a hardware store, replase the pcv valve with it, and then run both the nipples to a catch can( breather nipple + the new pcv valve "straight through" fitting). I was planning on doing this after i move my battery to the back. Is there anything wrong/dangerous with this mod.? Ya, im going to plug the manifold nipple...got any suggestions on what to plug it with??? those little rubber caps would just pop off.
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you guys should read that thread i posted, but to answer some questions...
Aluh, no negative side effects
doug, it vents from the same place. taboo and rre are correct. you would only have a huge boost leak and fill the crankcase with pressure if you did NOT cap off the intake manifold, and that was what shabby was saying in your quote.
cam, you most likely won't be able to find a straight fitting with a thread pattern that fits (details in the link). just unscrew the nipple in the intake manifold, unscrew the pcv in the valve cover, swap places, cap off the pcv (which is now in the intake manifold). capping the pcv off with a rubber vacuum cap will do. i have all my intake manifold vacuum lines removed, and they're all capped by those rubber caps. just zip tie them under the bead roll if you want to be safe. this works since the pcv and intake manifold nipple use the same thread pattern--now you have a straight fitting on the valve cover and a sealed intake.
Aluh, no negative side effects
doug, it vents from the same place. taboo and rre are correct. you would only have a huge boost leak and fill the crankcase with pressure if you did NOT cap off the intake manifold, and that was what shabby was saying in your quote.
cam, you most likely won't be able to find a straight fitting with a thread pattern that fits (details in the link). just unscrew the nipple in the intake manifold, unscrew the pcv in the valve cover, swap places, cap off the pcv (which is now in the intake manifold). capping the pcv off with a rubber vacuum cap will do. i have all my intake manifold vacuum lines removed, and they're all capped by those rubber caps. just zip tie them under the bead roll if you want to be safe. this works since the pcv and intake manifold nipple use the same thread pattern--now you have a straight fitting on the valve cover and a sealed intake.
cam, if you really dont want to use any of those rubber caps, heres another alternative
leave the pcv hose connected to the intake manifold the way it always was. cut the other end of the line down to like an inch, plug it with a bolt in the open end, then tighten a hose clamp around it real tight. i like that method better ever since one of those caps blew off during a leak test
leave the pcv hose connected to the intake manifold the way it always was. cut the other end of the line down to like an inch, plug it with a bolt in the open end, then tighten a hose clamp around it real tight. i like that method better ever since one of those caps blew off during a leak test
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Well i'm in a 2G and just eliminated my whole evap system incl. the PCV valve. I just ran the PCV line and the breather line together into a filter/can. Should have it cranked within a week. I'll be driving it for a couple of weeks before i do my engine/turbo swap so i'll let anyone know if i have problems.
Yep, I dont see how it would make you run richer at all. The gases normally are sucked into the intake mani anyway and the oily vapors etc will do more harm than anything I would think. I cant think of how this would be in any way a bad mod to do.
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