Quote:
Originally Posted by AndrewS13
Tunermt's claim that it is wrong because of unmetered/dirty air. I figured it'd be compensated for in the tune, but I've only done a base tune on a DSM so I'm definitely not the most knowledgable.
|
No that is not what i said, sorry if i did not make it clear.
OEM set up is ok and clearly works fine for most applications. If emissions inspection is not an issue I prefer not to use the OEM PCV design for the following reasons:
-low flow at high crank case pressure do to limited outlets/size on valve cover and crank case.
-The PCV 1 way valve between intake manifold and valve cover is prone to leaking which can lead to a boost leak directly into the PCV system.
-Venting to atmosphere keeps the crank case fumes out of the intake/turbo/intercooler. Over time this just keeps everything a bit cleaner and oil free.
The problem i mentioned of un metered air only comes into play when someone installs a catch can into the PCV system incorrectly which is something i see some what often and have to address before tuning.