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Greddy Type S BOV once and for all

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limitup

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Discussion starter · #1 ·
Ok so I put in my new Greddy Type S BOV and I can't figure out how to adjust/install it properly. I have searched and read EVERY thread I could find on the subject, but there is so much conflicting info that I'm just as confused as when I started. Here are various conflicting statements I read when I did a search:

"Don't ever connect the small nipple to anything unless it's a race car - just leave it open"

"Connect the small nipple to a pressure source on the turbo"

"Connect the small nipple to the same line as the big nipple"

"Just cap/plug the small nipple"

"The soft/hard adjustment controls boost"

"Just leave it all the way soft, that will hold at least 20 psi and you won't get any compressor surge"

"Make it as hard as possible without compressor surge"

"The soft/hard adjustment makes no difference unless you connect the small nipple to something"

Blah blah blah blah blah. Now, my problem is that I am having a hard time holding 20 psi ... and when I lift slowly at part throttle it makes some hella weird sounds. Not the "juuh juuuh juuuuugh" sound that is supposed to be compressor surge ... more of a high pitched sound. But not a squeek ... it's more like a bird chirping ... 3, 4 or 5+ times depending on how slow I lift off the gas.

I will try every possible option/combination if I have to ... but I'm hoping someone has a more definitive answer on what to do with the small nipple for starters. So far I've left it open and whether I adjust the BOV all the way soft or all the way hard I can barely tell any difference at all.
 
#2 ·
If you have the T too small you can connect the small nipple to the nipple at the turbo housing. Thats what I did for over a year and a half no problems. Tighten it till you hear compressor surge, then loosen it till you don't. Thats basically how you set it.
 
#3 ·
44pirate said:
If you have the T too small you can connect the small nipple to the nipple at the turbo housing. Thats what I did for over a year and a half no problems. Tighten it till you hear compressor surge, then loosen it till you don't. Thats basically how you set it.
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You shouldn't be running the T25 at 20 psi very inefficient. If you have an upgraded turbo then just cap off the little nipple and forget about it. The t25 can't hold 20psi it can hardly hold 15psi to 5500 rpm so if your saying your having trouble holding 20 psi thats why its the T25 not the BOV
 
Discussion starter · #4 ·
Sorry I should have included more info on my setup. I'm running the FP Big 28 and HKS EVC IV boost controller. So, the nipple on the turbo is currently being used. Someone said I shouldn't tap into that for the lower nipple since it's being used by the boost controller ... know anything about that?
 
#5 ·
limitup said:
Sorry I should have included more info on my setup. I'm running the FP Big 28 and HKS EVC IV boost controller. So, the nipple on the turbo is currently being used. Someone said I shouldn't tap into that for the lower nipple since it's being used by the boost controller ... know anything about that?
Click to expand...
NO I don't know about that. When you say you have trouble holding 20 psi. DOes it drop as you go up in the rpm's or does it increase as you go up in the rpm's
 
Discussion starter · #6 ·
It drops to around 16 psi by the time I hit redline ... but it didn't do this before with my 1G BOV running at about 17psi. So it seems the greddy BOV is too loose ... but when I make it harder it doesn't seem to do much.
 
#7 ·
I had all the same questions that you do when I first got the Type-S.

Based on the design, the small nipple is a second location that you can hook up a pressure source to, which helps open the BOV. It simply helps the BOV operate quicker, to avoid compressor surge. That is why you saw quotes of people telling you to hook it to a pressure source. If you are already using the hole on the compressor housing, then you really don't have any sources that aren't being affected by anything else. (This is a long explanation but if you connect it to the line that your boost controller is set to, then when the BOV opens, the boost controller will never see the actual amount of pressure that the tubo is making, and it won't open the wastegate. So this could be somewhat dangerous). You can just plug it up...the Big28 shouldn't be that prone to surge anyway.



As far as the spring. The more you tighten the screw, the more it compresses the spring, which makes the BOV hold more boost. It makes the valve harder to open.

Eric
 
#8 ·
99GSTRaptor said:
I had all the same questions that you do when I first got the Type-S.

Based on the design, the small nipple is a second location that you can hook up a pressure source to, which helps open the BOV. It simply helps the BOV operate quicker, to avoid compressor surge. That is why you saw quotes of people telling you to hook it to a pressure source. If you are already using the hole on the compressor housing, then you really don't have any sources that aren't being affected by anything else. (This is a long explanation but if you connect it to the line that your boost controller is set to, then when the BOV opens, the boost controller will never see the actual amount of pressure that the tubo is making, and it won't open the wastegate. So this could be somewhat dangerous). You can just plug it up...the Big28 shouldn't be that prone to surge anyway.



As far as the spring. The more you tighten the screw, the more it compresses the spring, which makes the BOV hold more boost. It makes the valve harder to open.

Eric
Click to expand...
I just put in a16g. My problem is I get compressor surge no matter how hard or soft I set the Greddy S. Do you have any thoughts on my problem?
 
Discussion starter · #9 ·
I'm seeing the same thing. I have the BOV set to about 1/2 turn from all the way soft, and I still get pigeons when I lift the gas slowly at low boost. I have read that a lot of people say they get slight compressor surge when lifting at low boost, but that can't be right? Plus with it so loose I fear it won't be able to hold the 20+psi I want to run soon. I need to order a new lower IC pipe from dejontool anyway, so I think I'm going to have them add a nipple to it, so I can hook the little nipple on the BOV to the lower IC pipe. Then I should be able to re-adjust the BOV more towards the hard side, and hopefully not get any compressor surge. Does this make sense or am I missing something?
 
#10 ·
limitup said:
Sorry I should have included more info on my setup. I'm running the FP Big 28 and HKS EVC IV boost controller. So, the nipple on the turbo is currently being used. Someone said I shouldn't tap into that for the lower nipple since it's being used by the boost controller ... know anything about that?
Click to expand...
Why did you tee off the nipple?>.....You should have your boost source for the boost controller teed off the line going to the top nipple to the greddy......Then that will open up the the nipple off the turbo to run to the lower nipple on the greddy...

I have a hahn....(has nipple on compressor) And have yet to run a vac line to the lower nipple on the greddy as of yet.....But i think i am going to try it one of these days to see if it makes a difference.....As i too get the "pigeons" when i let off of the gas @ part throttle >low boost
 
Discussion starter · #11 ·
The EVC IV boost controller has 3 ports on the solenoid. Port 1 goes to the intake manifold (same as the big nipple on the BOV), Port 2 need to be connected to a pressure source (nipple on the turbo) and Port 3 goes to the wastegate. So that's how I have mine setup now. So I figure if I get a new lower IC pipe with a nipple I can connect the small nipple on the BOV to there.
 
#12 ·
Ok I kept asking this same question when I first got my Type-S and I took it apart since the previous owner had rotated the cap, and whallah the diaphram is pinched. New diaphram $80 from Greedy. Still does it but not as bad. I am on the T-25 and running 16psi with it set in the middle, I had it set full soft but I didn't like how the car felt under acceleration. Basically it goes like this, you want a BOV that can take more boost then you have to settle for part throttle surge. If you drive your car everyday like me you would be surprised to see how much money you save in gas if you quit hitting boost unless you are WOT, its not that hard. I get ~350 miles a tank and I get on it a couple times everytime I go out its the part throttle boost that eats gas. So just don't get part throttle boost and poof no more surge at part throttle.

Taylor
 
Discussion starter · #13 ·
What you're saying sounds logical, but a few things bother me. A well-known DSM tuning "guru" told me that I shouldn't be getting any compressor surge at all. The other thing is that a 1G BOV holds at least as much, if not more, then the Greddy Type S on full soft. With the 1G BOV I get no compressor surge whatsoever, so why do I get it with the Greddy on full soft? I've even connected the lower small nipple on the Greddy BOV to a pressure source and it doesn't even seem to make any difference.
 
#14 ·
The type S spring should be stiffer than the stock 1g spring.I have no comp surge at all with my Greddy....Also is you 1st gen bov compressed?

Some peolpe have peoblems with the Type S and some don't.I've had problems with mine diapham leaking.Put some RTV on it and it's fine now.Then the dasmn set screw stipped out and had to retap it... :/
 
#16 ·
Yah, all you people who don't have a "boost source" for that second nipple, listen to DookGST. you really ought to T your MBC or EBC onto the line that goes from the TB to the upper nipple of the BOV, and use the Compressor nipple to presurize the second nipple of the BOV.

I used to have all sorts of trouble with the Type S until I T'ed that TB->BOV hose.

to my suprise reason this also made my Hallman MBC much more accurate. Honestly i have no idea how it might change an EBC's accuracy,

anyone have their EBC's T'ed ??
 
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Discussion starter · #17 ·
My EBC IS T'd into the BOV line that goes to the TB. But the EBC also makes use of the nipple on the turbo, so I'm adding a nipple onto my lower IC pipe for the little nipple on the BOV. Not sure why though ... it doesn't seem to do anything. I temporarily disconnected my EBC and put in my Joe P MBC and then connected the little nipple on the BOV right to the nipple on the turbo, and it didn't do jack sh*t. No difference at all...
 
Discussion starter · #19 ·
Are you suggesting that my problem is/might be caused by the torn rubber membrane like the problem you had? I don't have a leak ... just some weird azz noises when I lift at low boost. Or are you saying that might also be caused by a torn membrane? In any event, this thing is brand new. I'm sending it back and getting another one. If that one does the same thing I'll just switch back to a modded 1G BOV. Thanks everyone!
 
#20 ·
Friend of mine has the type S.... that chirping from his explanation of things was a trademark of the type S not a bad thing... just how it handles low end venting... *shrug* could be wrong but I wouldnt worry about that chirping... all the type S's ive heard sound like that when you back off at low throttle....
 
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