Greddy Type S BOV....2 vacuum lines?
 

I bought an eBay greddy type s bov and it has 2 fitings for 2 lines. I know one goes to the intake manifold and i read that the other one goes to the pre-turbo pipe? and just to clarify the top fitting goes to intake manifold and the bottom to the pre-turbo? thanks.
https://images.channeladvisor.com/Se...-TYPE-RS-2.jpg

Re: Greddy Type S BOV....2 vacuum lines?
 

yes but I just leave the bottom one alone

Re: Greddy Type S BOV....2 vacuum lines?
 

unless ur doin a low low boost app, hookin up the bottom line helps it blow off easier for less chane of compressor surge. but if ur boostin enough leave it alone

Re: Greddy Type S BOV....2 vacuum lines?
 

around 8psi is that low?

Re: Greddy Type S BOV....2 vacuum lines?
 

that's about normal for daily drivers. jus try it out without the second one, if it seems like a lil sergy... either loosten the top adjustment screw, or hook up that lower one, jus adjust it so it dont leak under boost, if it serges then hook up that pressure source on the bottom

Re: Greddy Type S BOV....2 vacuum lines?
 

in the pic they have the bov piped into something... wtf is it piped into? (where it blows off too)

Re: Greddy Type S BOV....2 vacuum lines?
 

I thought the lower one was just a vent so the diaphram could move, you can hook it up to the air intake side so you have filtered air.

you can do that for maf systems or just if you want it quite, stock cars are like this.

Re: Greddy Type S BOV....2 vacuum lines?
 

nope... it takes its air like the wg, positive pressure which helps lift the diaphram which reduces compressor surge cuz it actually opens sooner, gives you more of a whistle rather then a flutter.

Re: Greddy Type S BOV....2 vacuum lines?
 

for mine to work right I had to take out one of the springs(smaller one).

Re: Greddy Type S BOV....2 vacuum lines?
 

i tried that, then the piece of ---- wouldn't hold boost.

Re: Greddy Type S BOV....2 vacuum lines?
 

How do i know if i have compressor surge? what does it sound like?
Right now i have the bottom line to atmosphere and when the bov goes off it lets out like a laser woosh sound immediately followed by a softer squeak/whistle sound

Re: Greddy Type S BOV....2 vacuum lines?
 

the softer squeek whistle noise could be compressor surge, almost like a soft duck or a choked out pigeon

Re: Greddy Type S BOV....2 vacuum lines?
 

That's exactly how my apexi twin chamber works. When i used to get compressor surge it kinda made a chu chu chu chu sound when you'd let off the throttle, just really fast though.

Re: Greddy Type S BOV....2 vacuum lines?
 

the chuc hu chu chu sound is compressor surge lol

Re: Greddy Type S BOV....2 vacuum lines?
 

for lower boost setup do you connect only the lower one or both of the nipples?

Re: Greddy Type S BOV....2 vacuum lines?
 

both, top for vac source, bottom to pre-throttle body, jus like the wg comes factory, like the nipple on the compressor housing. no vac source should go to the bottom one or else it wont blow off. only pre-throttle body positive pressure

Re: Greddy Type S BOV....2 vacuum lines?
 

Im thinking about buying a cheap knock off Greddy tyoe s but is it worth it? I might buy a used Real one.

Re: Greddy Type S BOV....2 vacuum lines?
 

i hear there almost the same, if you dont boost much, go for it. if your a power monster then get a real bov, not even a type s

Re: Greddy Type S BOV....2 vacuum lines?
 

AKS dump trunk bov :8

Re: Greddy Type S BOV....2 vacuum lines?
 

I bought one of there BOV's too. They sent me a carbon fiber one though (I wanted a Purple one). I drilled a hole in the charge piping and JB Welded a brass fitting on there for the 2nd vac line.

Re: Greddy Type S BOV....2 vacuum lines?
 

exactly what ur supposed to do lol, but there is a pre-throttle body port on most throttle bodies which dont see vac which woulda worked also

Re: Greddy Type S BOV....2 vacuum lines?
 

wait i don't get it......so are you supposed to tap the second line to the charge piping after the turbo? or before the turbo?

Re: Greddy Type S BOV....2 vacuum lines?
 

after turbo but before throttle body... jus like your wastegate son