got one of those cheap greddy knockoff bov's from ebay I'm putting on the car now.

I'm running 9psi on the engine. which of the two springs do I use with it?? the big one or the small one or both??

I'm thinking just the big one but I want to make sure.

 

use whatever one allows the bov to be slightly open at idle. On a previous setup with that type of bov I believe we used just the larger spring and adjusted the screw at the top for fine adjustment. Worked great.