Yes, I have also seen what you have seen. Let me put it this way - my Mustang makes 900+ hp, idles at 700 RPM, and gets 18mpg. I have over 200 dyno runs tuning it. I tried everything. It worked best with the vent connected. On my Mustang I have fabricated sheetmetal valve coves and I went to the expense of welding in a -12 fitting and run a braided steel hose to another welded -12 connector on the back of the supercharger inlet pipe. It is worth the effort if you are interested in reaching peak performance -AND- drivability. You can have a car that runs perfectly well with it vented, but it will run better with it connected!Originally posted by 5150 LX
I can see your point and it is well taken, but I have run a K&N breather on mine and it idled rock solid at about 900 RPMs, I also have seen in person numerous guys cars at the track and elsewhere use one & idle fine, there are several members here running one and idle fine.
The Novi 1000 kit includes a fitting, hose & filter to run from the oil filler neck to the shield that covers the air filter, this replaces the hose that goes to the throttle body, again this worked for me & idled fine but yet the design is still an open loop....
Just sharing my personal hand-on experiences.
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