there are 2 vacuum hose nipples on the new greddy type s BOV i have. do they both need to be hooked up. its kinda weird. i have the top one hooked up right now and the bottom is open. the snaping sound is kinda laggy though. doesnt sound like i thought it would at 6psi boost? should i run both nipples to vacuum/boost sources?

 

One of the nipples goes to the intake manifold, and the other goes to a pre-manifold source.. (charge pipe).

I forget exactly which one goes where, but it gives better response.


The top one goes to the intake manifold. The bottom one goes to a chargepipe.. or pre-TB.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93turbo16 &raquo;</TD></TR><TR><TD CLASS="quote">One of the nipples goes to the intake manifold, and the other goes to a pre-manifold source.. (charge pipe).

I forget exactly which one goes where, but it gives better response.


The top one goes to the intake manifold. The bottom one goes to a chargepipe.. or pre-TB.</TD></TR></TABLE>

yup top goes to anything post throttlebody and the lower smaller nipple goes to pre-throttlebody, it makes it open much faster

 

so what do you all mean by pre and post TB? for pre i dont have anything hooked up to any of my charge pipes. what should i do? cant i just hook them up to different vacuum sources?

 

No, one has to be pre-throttle body. You said exactly what we mean.. before the throttle body, on the charge pipe or out of the compressor housing. If you don't have anything on the charge pipe, then leave the smaller nipple.. the one on the bottom, open to the atmosphere.

You can hook it up two ways. One way with the bottom nipple open. And the other with it connected to a pre-throttle body source.

 

what i did was tap the charge piping and put a threaded nipple on it right next to the bov flange

 

ok, but i dont understand what that does? any source of vacuum should work right?

 

what would happen if i did T it into the top vacuum source?

 

top one need a vacuum sourse from inside the im. lower one goes on the charge pipe
i'll take a pic for you tomorrow when i wake up

 

this topic has been discussed to death (search for details)

I have mine hooked up like this, and I definitely notice a quicker response (no turbo chatter between shifts)

It's really a simple concept called Delta-P. You want the highest possible delta-P when comparing pressures between each side of the diaphragm..anotherwords, if you have let's say 10 Psig pressure on the bottom side of the diaphragm and 22 inches of vacuum on the other side, the valve is going to open much faster than if you only have atmospheric pressure on the bottom side of the diaphragm.

Granted the Delta-P is only higher for a moment, but sometimes that moment makes a difference.

 

I have mine hooked up like ^ does. Its not hard and takes 5min. Just run to the hardware store and get a barbed fitting, remove a peice on IC piping, drill a hole and thread the barbed fittin in. Costs like $.80 and took a couple min. I just threaded mine directly under the BOV and put JB weld around the fitting so it wont leak.

 

how soft/hard are you running the valves? i dont really like the way mine sounds. 6lbs boost

 

Here is how I adjusted mine, I dont know if its the proper method or not but it worked for me. (actually i think i need to go a wee bit tighter)

Start the car up, let it warm up and idle normally.

Loosen the lock nut on the stud, then turn the stud out so it DOES leak at idle. You should be able to see clearly through the valve on the bov.

Then slowly tighten the stud until it just seats and no longer leaks when the car is at idle normally. You may want to go a bit tighter as well than that.

Again i dont know if thats the correct method, the directions just say to tighten until it dosent leak at idle. My bov is very noisy. At 10-12psi it really sounds nice. Normal driving not even hitting any boost you can hear it "whistle". Even at about 4+psi its pretty loud. Which is pretty much what i hear from most people with a type-s.

 

do you actually hear yours start to whistle as the turbo spools?