Greddy Type S: Does this mean I've got a leak?

[soldave]

Well I managed to pick up my Greddy Type S BOV after 2 failed attempts earlier in the week. Got the thing hooked up and set it to soft so I could configure it. Went out for a short drive and was getting a lot of compressor surge. Strange, but I went home and softened it even more. Went out again and same thing.

Got very frustrated and checked everything was fine by putting the stock dump valve back on. It was, so I started taking the dump valve apart to check the diaphragm. That was fine, and I noticed in the valve that there are 2 springs. I removed the smaller one and put it back together. Set the adjusting screw to middle tightness and went for a drive. Finally got the BOV making a noise when on boost and no compressor surge.

But having to remove one of the springs got me thinking: is that a decent sign I've got a leak somewhere? I will get a compression/leak check in a week or so but wondered what you guys think. I should also add that today I was running stock boost of 0.71 bar. Once my tuner comes back from his holidays I will be cranking it back up to 1.5 bar. Maybe at those higher boost levels, the other spring will need to be put back in.

Any thoughts would be appreciated

 

[tbonitz301]

You are leaking boost. Put the spring back in it. Sounds like you are creeping. If thats the case your BOV is going to do nothing for you. Port your o2 housing.

 

[soldave]

Forgive my ignorance there, but what is telling you that I'm creeping?

 

[bluetlr2001]

Im not sure if you have a boost leak or not and im not sure were they got the idea of boost creep. But i have heard of people having to do the single spring mod to the greddy bovs because some cars dont have enough vacuum to pull it open with both springs in. Buti would do a boost leak just to be safe. If im not mistaken there have been posts on here about the single spring mod. You can search it some just to be sure

 

[soldave]

I'm with you on that comment about the creep. That would mean the boost is going up without control and that certainly isn't happening. I will get O2 housing ported at some stage but it's not something I really need in relation to this problem.

I reckon I do have a small leak or 2, and would be really surprised if I didn't. I think I did the single spring mod right, but will go and search the forums to make sure...

 

[m_0ney_pit]

The type-s usually leaks stright from the factory. To fix it take some silicone and put a ring around the inside where the rubber meets the top of the housing. You also might have a leak in the rubber diaphram so check that out also. They also leak from the top of the adjustment screw so put from teflon tape on that.
The only way to make it stop compressor surging at partial throttle is to hook up the lower port to a boost source but that also leaks and there is not a good way to fix it. I suggest if you want to hook up the lower port use a line that goes to your wastegate because it will give slightly higher pressure and you really won't notice it as a boost leak. After all that sealing and modifying its still not as a good as a 1g BOV or evo 8

 

[D's GS-T]

Did you check all your hoses and everything. On my type S it fluttered like crazy, and I finally figured out I have a leaky hose. after I fixed the hose it worked perfect for me. I love the type S, bit it was a real PITA until I got it figered out. And yes some people take the spring ut and run it like that. I was going to, but I fixed it.

 

[soldave]

I will check all the hoses once my buddy who has the compressor gets back. That may be the reason I'm getting compressor surge instead of the normal BOV sound with 2 springs in.

 

[meliketoball]

I will check all the hoses once my buddy who has the compressor gets back. That may be the reason I'm getting compressor surge instead of the normal BOV sound with 2 springs in.

I'd take that lemon of a dump valve you bought out and put the stock one back on. If you bought it used, go back to that guy and tell him you sold me a POS.

Anyway, you live in Japan.. How cool! And your English is excellent.

 

[soldave]

So are you saying that particular BOV is faulty, or is it something you don't like about those BOVs in general?

 

[m_0ney_pit]

I was saying in my last post where the leaks in the greddy type-s are located and how to fix them. I don't personally like the type-s...I have one sitting right next to me and I have a 1g on my car.

 

[edenTSI]

same. bought a type-s and took it off like 3 weeks later. stupid investment but i sold it to my buddy so whatever. i just got another 1g bov that i plan on crushing soon.

 

[soldave]

A mini-update here as the plot deepens. Last night I put teflon tape on the adjustment screw and top nipple as advised by a couple of sources to ensure no leakages from there. Anyway, today I went for a drive after work and put the foot down a little. I find that when I take my foot off the gas (to change gear or when I need to brake), the BOV only makes its noise at low boost. When I'm running at my stock boost levels (around 0.7) there is no compressor surge or anything, but the BOV makes no sound at all.

Is that because the valve is just opening too much and letting all the air out quickly? I'm not technically minded so may be way off but I'm sure some of you might be able to figure out what's going wrong with this thing.

 

[Gregory]

That would make perfect sence since I believe the adjustment bolt is 100% on the top of the valve where there is suppost to be vacuum to pull open the valve when you let off the throttle. If that was leaking before, it was leaking vacuum when you let off, and thus, not opening to its full potential.

 

[soldave]

This morning I put the other spring back in and went for a very quick drive before work. Had the spring set to maximum softness (i.e. just in) and when I changed gear it was dumping (i.e. no compressor surge) but with very little noise. At low boost, I was getting a noise. Think it might need tightening/hardening a tiny bit more, maybe along with some teflon tape on the adjustment screw to make sure I'm not losing any vacuum.

I never thought setting up a BOV would be so much damn work!

 

[95CarbonEclipse]

Tell me about it... I've got the Type S and must've tweaked with that thing for months. I'm still not sure if it's set correctly or not. I can't wait to get a blow through setup so that I can switch to a Tial BOV.

 

[soldave]

The annoying thing now is that I could pick up a Greddy Type R for $100! Would do that but am determined to get this damn thing working correctly.

 

[m_0ney_pit]

Its about as good as it gets with both springs in and the adjustment screw backed all the way out. It will only surge under vacuum then.

 

[soldave]

Well, I think I know why I was having issues. Just went to adjust the screw at the top and it popped off and flew into my face! It's taken out the threads in the cap so I'm a little buggered. Have managed to put my MacGuyver hat on though and botched a repair. The adjustment screw is now not in there. I have a couple of wahsers pushing the spring down inside and the ever-reliable duck tape keeping it airtight. I might be a little hasty, but it seems to be working...

 

[m_0ney_pit]

Well, I think I know why I was having issues. Just went to adjust the screw at the top and it popped off and flew into my face! It's taken out the threads in the cap so I'm a little buggered. Have managed to put my MacGuyver hat on though and botched a repair. The adjustment screw is now not in there. I have a couple of wahsers pushing the spring down inside and the ever-reliable duck tape keeping it airtight. I might be a little hasty, but it seems to be working...

Thats so ghetto, just go to the hardware store and get a new bolt...

 

[soldave]

Not the bolt I need. The bolt is fine. It's ripped the threads out of the cap itself.

 

[m_0ney_pit]

Oh ok thanks for clearing that up. Same thing actaully happened to mine, I just tapped out the threads to an m6 and put a stainless bolt in

 

[soldave]

May have to look into that. Only issue is here in Okinawa tap & die kits are as rare to come across as rocking horse crap! May be a side-job for my mechanic when I've got other work for him

 

[soldave]

Just an FYI for you all. Even with enough duck tape for a large-scale kidnapping (!) covering the adjustment bolt hole at the top, the Greddy BOV will still leak at 1.2 bar. Rather than put another adjustment bolt in, I think I'm just going to ghetto-fix it by welding a tiny plate over the hole. It won't really be adjustable (only by washers put on the inside) but will be much more secure.