PCV/catch can setup for a street car - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-18-2013, 01:10 PM   #21
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..... not sure if trolling....
you're not sure im trolling because im suggesting if you open a huge port to atmospheric on your IM, behind your TB, you will idle at a very high RPM?
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Old 04-18-2013, 01:13 PM   #22
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Well I mean, the pcv is kind of already fully open when the manifold is under vac and closes as the manifold pressure becomes greater than the pressure in the cylinder head.
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Old 04-18-2013, 01:28 PM   #23
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Not true. It's fully open the closer to atmospheric, with more vacuum the plunger reduces the flow as it's sucked up against the inlet. it only closes completely with boost.
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Old 04-18-2013, 01:36 PM   #24
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you're not sure im trolling because im suggesting if you open a huge port to atmospheric on your IM, behind your TB, you will idle at a very high RPM?
I'm a little offended that you think i'd be stupid enough to not plug that hole. IF i do this, it will not be the first time i've removed a PCV system entirely. But previously that was on motors ingesting well more than 20psi of boost. (WAY overfilled, you know?) Or on a motor that no longer had an intake manifold.

My simple question was whether or not that'd be stupid on a BP that won't see more than 18psi at the most. If i want to go over that, it'll be on a built motor and i'll re-visit the subject at that point.
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Old 04-18-2013, 01:38 PM   #25
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you're not sure im trolling because im suggesting if you open a huge port to atmospheric on your IM, behind your TB, you will idle at a very high RPM?
I think he means capping it off lol.


What about the MSM PCV?
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Old 04-18-2013, 01:39 PM   #26
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I think he means capping it off lol.


What about the MSM PCV?
I have an MSM with an upgraded turbo that's about to get tuned @ 15psi or 250wtq, whichever comes first.

Hence the questions.

Is the MSM super awesome or something? I know on other motors we used to snag the 323GTX PCVs because they held up better under boost in theory.
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Old 04-18-2013, 01:39 PM   #27
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Quote:
Originally Posted by concealer404 View Post
I'm a little offended that you think i'd be stupid enough to not plug that hole. IF i do this, it will not be the first time i've removed a PCV system entirely. But previously that was on motors ingesting well more than 20psi of boost. (WAY overfilled, you know?) Or on a motor that no longer had an intake manifold.

My simple question was whether or not that'd be stupid on a BP that won't see more than 18psi at the most. If i want to go over that, it'll be on a built motor and i'll re-visit the subject at that point.


most people here will plug that hole and weld a second bung on the other side where it has better baffles.
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Old 04-18-2013, 01:45 PM   #28
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most people here will plug that hole and weld a second bung on the other side where it has better baffles.
Excellent, then just run both vents at that point to a catch and call it a day.

So that answers that question, but is this something that would be overkill and more work than it's worth to do on a "mid-boost" MSM? (I'm not sure if that qualifies as over-filling.)
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Old 04-18-2013, 01:46 PM   #29
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I'd just let the factory catch-can do its job.
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Old 04-18-2013, 01:46 PM   #30
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Quote:
Originally Posted by concealer404 View Post
I have an MSM with an upgraded turbo that's about to get tuned @ 15psi or 250wtq, whichever comes first.

Hence the questions.

Is the MSM super awesome or something? I know on other motors we used to snag the 323GTX PCVs because they held up better under boost in theory.
Yeah I dunno just figured it's an OEM valve designed to take boost and easier to source than the 323GTX valve.
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Old 04-18-2013, 01:51 PM   #31
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I'd just let the factory catch-can do its job.
Cool, thank you.

There's some issues with the factory catch can and how terrible it is, but for my street car, not likely to be a problem.
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Old 04-18-2013, 01:59 PM   #32
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i mean, the same can be said for the MSM turbo setup and ECU alone... so.
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Old 04-18-2013, 02:01 PM   #33
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i mean, the same can be said for the MSM turbo setup and ECU alone... so.
I don't know what you're talking about. Clearly it was the turbo Miata Mazda should have created.
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