Greddy Type S bov Installation question

[bruinbear714]

Ok guys, I was cleaning up my garage when I found the paper work to my greddy type S... It shows the top nipple to be fed vacuum/pressure. Which is the way I have it. The bottom nipple that comes off the BOV at an angle shows that it needs to have pressure feeding it from the SAME pipe its mounted to. Basically just a 3 inch hose from that nipple down to the same hot or cold pipe its mounted to so it see's pressure all the time. I also looked at my HKS bov and its shows the SAME diagram with both nipple's hooked up. I called Greddy, turbonetics, and some other companies and they all had different answers. Some said it should be vented, some said that lower nipple needs to see pressure...Now I have noticed on my motor, when I give about 10-25% throttle, my bov starts to trip open and closed really fast thus causing the motor to really hesitate badly... The only way to cure it is to push the throttle more or release throttle completly...Now, I have tightened the spring all the way and loosened it all the way and this problem remains. Which leads me to believe that this bottom nipple might need to be hooked to pressure...What do u guys think..??

ThanksRobert

I just finished an SR swap that uses the Greddy Type-S bov also... we have the bigger nipple of the two tee'd off the wastegate signal, and the smaller of the nipple unconnected. The car will stumble when rev'ed up and allowed to idle. However, with recirculation the car works fine even with the little nipple unconnected.

[SloS13]

I just wanted to point out that you said nipple. That is all

Just kidding. I was getting compressor surge no matter how much i adjusted the Type-S. Much better after connecting the second nipple. Haha. I said nipple

[klattr1]

the bottom port allows for better response. Most people dont even mess with it.

[C-Kwik]

I just wanted to point out that you said nipple. That is all

Just kidding. I was getting compressor surge no matter how much i adjusted the Type-S. Much better after connecting the second nipple. Haha. I said nipple

Surge seems unlikely to me. Unless the BOV just wasn't opening at all when you lift off the throttle. But it should not surge while boosting even with a wide open BOV. Surge occurs when the motor can not ingest enough air at a given psi or to be more accurate, pressure ratio. In either case, if the BOV was wide open, the turbo would flow more air at a given boost since it would be working harder to try and maintain the wastegate's set boost level.

[andrave]

I have an hks bov with the same setup, and I was told to hook one side up to vaccuum and one side up to boost, and if it leaks too much at idle, just to tee them both together off vaccuum, but that way it won't open as quickly either.I'm doing blow through mafs so I'm gonna go with boost assist initially and see how it works.