Favor to ask if you have an SK synchrometer
 

If you have one of these synchrometers and a 986 Boxster S....could you put it on the oil filler while the car is running and tell me what the flow rate is? Curious for diagnosing my AOS.

Thanks!

http://www.alamomotorsports.com/weber/STE_SK.jpg

Not what you need to diagnose an AOS; the system should be pulling around 5 inches of water vacuum if the AOS is in good shape, if it is over 7-10 inches of water, the AOS is toast. Note that the measurements are in inches of water, not mercury like most vacuum test equipment.

I had read airflow increases too. But definitely trying to find a pressure gauge and figure out a way to measure without cutting a hole into my oil cap.

Of course air flow would increase with rising vacuum; but there is no spec for what the flow rate should be, while there is a maximum vacuum level...........