Quote:
Originally Posted by nick_d_240sx
In my attempt to better understand the factory PCV system here are a few diagrams from the Japanese FSM for the SR20DET showing the pipes connected to the intake related to the PCV system.
Factory SR20DET Intake Diagram
PCV and I'm not really sure where that lower pipe goes? Lower intake manifold? EDIT: Looks like it goes to the AAC valve
Split air pipe to intake manifold and lower pipe to lower intake manifold? EDIT: Looks like it goes to the AAC valve
I just thought this looked funny.
Another view
Picture
Ever since converting to Speed Density I have a catch can vented to atmosphere and have had a fucked up rich idle issue which led me to this thread. I am going to re-plumb the hose from the Tee on the valve cover to the catch can and back to the intake before the turbo. I will edit this post with results.
In my opinion -AN isn't really necessary for anything in the system. Simple barbs/hose/hose clamps are adequate. -AN only needed for pressurized fluid.
I find it hard to believe that a working PCV system vs Venting to atmosphere would actually net HP gains, but I think it actually will/does. Something so simple but necessary for applying vacuum to the crankcase. |
A broken pcv mostly makes your car leak, smoke, crud up and go to shit internally, which will sure fuck your net HP in the long run.
The gains here are doubtful - for one thing, running a huge line to pull huge vacuum actually takes power, that's energy spent one way or another, coming out of the same total volume of energy in your gas tank.
Vacuum's good in the motor, but there's going to be diminishing returns past a mild point, which is why production cars don't come with hoovered out PCV systems. Cars with excessively positive OR negative crankcase pressure develop all sorts of weird problems, like seals flipping and wearing, or other solenoids or systems not doing what you'd think because they can never bleed vacuum as fast as they need, or whatever.