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Old 03-22-2013, 09:30 AM   #2726
Scooby Newbie
Member#: 107171
Join Date: Feb 2006
Chapter/Region: South East
Location: Greenville, SC
2006 STi


Originally Posted by Acejam2k View Post
The Crawford AOS install does not cap off the PCV valve; it deletes it entirely. The PCV valve is directly under the throttle body, and the TB must be removed to gain access.
My bad. I didn't see the update to the instructions.
^This is not the point anyway.

Originally Posted by Acejam2k View Post
The PCV valve is considered an emissions control device. Emissions control devices cannot be removed in ST*. (This is why you must remain catted, for example)
Yes, the PCV is being removed, it is also being replaced with the AOS which serves the exact same function. The rules also say the PCV cannot be replaced. This is where I have the problem. You CAN replace a Cat with any cat.

Rules are Rules, you must abide by them blah blah. I understand. I am not going to break any rules and I am not trying to whine about anything. Lets have an intellectual discussion on why or why not the rule could be or should be changed.

Replacing the unit with a better one will still retain the emissions functionality. I am having a hard time seeing how you can extrapolate this issue into a modification which replaces the PCV valve that creates an overwhelming advantage. Does anyone have any ideas how you could replace the PCV and gain a huge advantage? Like stated before, you are not even allowed to run higher boost levels anyway.

Simply put, a PCV valve replacement should easily be allowable. If you can upgrade exhaust pieces for increased flow and better power in this class, then doing a mod that has no effect on emissions, no significant effect on power, no effect on chassis stability... it should be a no-brainier.

From Crawford themselves:
"This not only keeps the vehicle within specs of smog but keeps the oil from coating the tops of the pistons. We all know what that does to any tune you have; it causes detonation, a very bad thing for turbo engines."
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