My RPS 50mm BOV came with an extra spring, I'm guessing for a low vacuum motor? It didn't come with any directions. A lot of you guys are running this BOV, it's what Kyle sells with his kits.

Anyone know which spring I should be using for my 5.3L? It idles at 16 inHg and decel is 22-24 inHg. The plan is for 10-15psi of boost.

 

I have the stiff spring in one, and the weak and medium spring in the other....it really doesnt matter which spring you use since when you go into boost it will force it shut.

 

use the stiff one, works just fine

 

Thanks for the replies! Is there a proper way to test for the right one to use? Im assuming it has to do with how easily the BOV opens when letting off the gas.

 

yea.. its for the response time and so it shuts faster.

I just put my RPS on and run it.. it doesnt open till im in high rpms high load and let off real fast..

 

I play around with the hard spring cut it some to get it to open easier, but It came under to put the hard spring in and ride. My BOV open at higher rpm and letting off the throttle.

 

tial uses engine vac. to figure out what spring you will need

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