To start off, I have read every thread possible on this topic and can't find a answer specific to my problem.

With that out of the way, I just put on the Greddy Type S (With Single Spring Mod). I have tried tunning it with the adjusment screw 3 threads in, half way in, and screwed all the way in until the point of the annoying loud whistle. I don't have any flutter or compression surge that I can hear or feel, but the car is only holding ~17 lbs of boost. I have a dyno flash which should be set to 20.5 lbs OR 21.0, I don't remember exactly. Anyway, I'm thinking the DV is starting to open to soon and thus not allowing the pressure to build up to the 21 lbs. I'm going to put the stock DV back on this weekend just to make sure my boost guage isn't off. IS there any additional adjusments I can make to the greddy to have it hold proper boost? I'm starting to wonder if the single spring mod is really that great, if you take the stock DV and press on the valve and try to open it manually with your finger it takes a great deal of force, and with the greddy it's no where nearly as much force needed to manually open it by pushing on it with your finger. Another question to ponder, if the EVO can hold 21lbs of boost, shouldn't it be setup in such a way that the DV valve doesn't open at all until it hits ~21 lbs of boost, as where the single spring mod has it starting to open at 16 lbs of boost.

All in all, I think the greddy has potential, I don't want the annoying whistle, I just want a strong clean sound when it recirculates. Recommendations?

The only other mod is the HKS RS Intake.

Thanks guys.

 

bump to get some information flowing

 

huh, weird thing is I also have the type-s on my evo, and a bout two weeks ago I also couldn't get any more than 17 lbs. I've got the perrin mbc set at 20lbs. As soon as it hits 20 it just falls to 17 and stays there. I even tried spraying all the vacum hoses and fitings. Even checked my boost gauge to see if it was leaking and nothing. Not sure if it has the single spring mod because it was on the car when I bought it (last Jan) but i havn't had any problems until now. My mods consist of Buschur TBE, rmr intake, type-s bov and the perrin mbc. I was thinking that my mbc had taken a crap, but it may be the bov?

Hope someone can help us

 

Our customers have run into this also.
We go with an HKS Universal valve to cure it.
BTW the spring Mod wont help either.
It is a very weak BOV ... sorry..

 

HKS SSQV?

 

yup

 

so what causes it to build boost and then let it drop to 17 lbs.? What other bov's do you prefer?

Thanx

 

turbo running out of breathe. It's normal for the turbo to taper.

 

had the same problem..was only getting 17 lbs , took it off put in a MR bov pulls to 21.5 with no problems. i did read somewhere that the greddy doesn't hold over 18 lbs but i can't remeber when i found that.

 

I ran into the same problem. My type-s was leaking pretty bad because i "crimped" the rubber diaphragm when i put it back together. Most likely, you have to take it apart and very carefully screw everything back together to make sure you don't crimp the rubber diaphragm. When you screw it back together, look carefully between the 2 big flanges and use a very small screwdriver to poke the diaphragm back into place while screwing it back together again. FYI, i'm running both springs with no probs at all @ 22 PSI.

 

I have the same valve 93 map holds 24 drops to 22 and half.93 plus meth holds 28 drops
to26 and half . Single spring mod gt35 and xede controlling boost.

 

put the second spring back in

 

We'll here is an update. I have a dyno flash so I should be holding 21 psi in 3rd 4th and 5th gear until redline then taper to ~18 psi. It was working fine in the spring. Now I haven't really paid much attention to it all until recently. So I get the Greddy and put it on and get to about 18 psi. So I swtiched back to the stocker dv, and it it's doing the same thing around 18 psi. So I'm wondering if the hot humid air has anything to do with this. That or I have a leak somewhere. I put in a call to lancershop to see if they would take the greddy back and let me get something else. The greddy i got seems to have some defects by the way, the adjusment screw got stripped, or to be exact the screw hole is being stripped (and it seems others had this problem) and the recirculator vavle doesnt screw in all the way. It still has 2 to 3 threads left, but the bolt itself started to strip. It's almost looks like the bolt is the wrong size for the hole. So hopefully I'm gonna send it back and go with something else, but in the meantime im going to build a compression tester. If anyone in Baltimore has one that I can borrow for a weekend it would be much appreciated.

 

I tried it with and without the soft spring. I got flutter and compressor surge. It's true that the car seems to shift better with the single spring. But I'm still a little confused over all this. If you take the stock DV and try manually pressing the valve open with your finger, it's next to impossible. But the greddy is pretty damn easy. That just strikes me as wrong, I wan't a replacement dv that exhibts the same properties as the stock dv. If I can send this greddy back, what do you all think i should get. Im not intrested in sound, I just want something that can grow with the car (in terms of performance upgrades) and something that lets the react cleaner betwen shifts.

 

I've heard great things about the greddy. Can't hold boost at 17-20 psi??? You might have gotten a defective bov or you're not setting it right. It should not leak at those psi. 25?? Well that's a different story.

Good luck and look into the new forge RS.