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So you would consider my current setup, if it were on a turbo KA, a bandaid for a haggard setup, and even worse while NA? I'd like to hear what you consider a proper PCV setup. I don't wanna get into this because you and I should both know the PCV catch can setup has NOTHING to do with how my car is running, but since you wanna bring it up...
People run far simpler catch can setups on KA-Ts, with lines to PCV and valve cover vent running to a VTA catch can with no problems. On the facebook groups, I've seen tons of people running a catch can this way no issues. Running a straight fitting instead of a PCV valve allows less restricted flow of crankcase gases, and having these two sources hooked up to a vacuum is the PROPER way to do it, because putting these to a vacuum source improves ring seal and helps evacuate blowby more effectively. The valve cover vent is literally hooked up to the intake from the factory, and the PCV valve gets vacuum from the manifold from the factory.
Keep in mind, on my setup, the one vacuum source has plenty of restrictions: the tap for the intake is only 1/4" diameter, which is much smaller than the 5/8 intake vacuum hose the valve cover is hooked up to from the factory; I'm running a check valve so positive intake pressure at WOT isn't going through the crankcase; the catch can has a filter on the vacuum port so it doesn't suck up any oil from the other two ports, and finally, this vacuum is split between 2 sources: the valve cover vent and the PCV.
Putting my finger over the PCV/valve cover vent sources at the catch can only produces a small vacuum, hardly noticeable. The oil cap isn't hard to pull off, nor is the dipstick. The vacuum that is being pulled is not nearly as significant as you may think. Just to prove it wasn't the issue, I disconnected the vacuum hose, capped off the port for it, and ran the PCV and valve cover hoses to atmosphere. Car felt no different.
Yes, I know a catch can isn't something important on an NA car. I was trying to get rid of vacuum leaks (PCV hoses were destroyed anyway) and get this out of the way while I had the IM off, because I plan to go turbo eventually. No, obviously this doesn't make my car faster (though in high HP applications, a sealed catch can setup that provides crankcase vacuum has been proven to net 10-20whp increase on 500whp+ R35s), but I see this as a modification that improves function and health of my engine. You should see the stuff that the catch can accumulates. And how on earth would a catch can setup confuse the computer? You think the computer gets readings off the PCV system or something? Using a sealed catch can setup ensures all air going into/out of the crankcase is metered by the computer.
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