im looking at getting the ZZP 50mm BOV but dont know if i should get the 19" vacuum spring or the 21" vacuum spring. i have a 2.2L

 

check your vacuum at idle no load(out of gear if auto). whatever you get make sure you get the bov with the higher vacuum rating then what you are reading at idle no load. make sure you check the vacuum at idle with the engine warmed up.

ex: if your getting 15 inhg at idle then either will work. if your getting 20 inhg at idle then get the 21"

this will prevent the bov from opening at idle sucking in air and creating an air leak which will create boost lag.

 

I was hoping someone had already done that so I didn't have to lol. I'm lazy and don't feel like getting my vacuum gauge out of my toolbox. But o well guess I'm gonna have too.

 

get the 21inHg dude

 

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