PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

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Old Mar 11, 2009 | 04:44 PM
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Default PVC Delete

Any benefits for deleting PVC system with using a breather on valve cover and would this make it make more diffucult to tune?
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Old Mar 11, 2009 | 05:07 PM
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It's PCV not PVC. Don't eliminate it, just use a catch can to coalesce the oil vapors. No effect on tuning.
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Old Mar 11, 2009 | 08:12 PM
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You can upgrade to a LS6 valley cover and remove the PCV system if you desire. But you'll most likely still need a catch can. Do a search on the LS6 valley cover, its a common mod.
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Old Mar 11, 2009 | 08:39 PM
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Originally Posted by bigdsz
It's PCV not PVC. Don't eliminate it, just use a catch can to coalesce the oil vapors. No effect on tuning.

I'd beg to differ with the No effect on tuning statement. We've had plenty of customers that don't properly maintain their breathers that they just had to have because the internet tells them it is some wonderful thing. A saturated breather will affect idle drastically- Setting the IAC and TB set screw and or TAC module on a fly by wire car are predicated on airflow being steady. A plugged up breather changes all of that. Unless your engine builder specifically states that you have to have one (big cube motor) the stock pcv system and later LS6 pcv systems are the way to go.
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Old Mar 11, 2009 | 09:18 PM
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Sorry for not being clear, I meant the catch can has no effect. I don't think breathers are a good idea.
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Old Mar 13, 2009 | 06:03 PM
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Originally Posted by Doc
We've had plenty of customers that don't properly maintain their breathers that they just had to have because the internet tells them it is some wonderful thing.
Hey! I resemble that remark..
BTW..Did you get it to idle?
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