Boost Leak Test=Leak out of BOV recirc tube

[Champ Masters]

Got a little problem. I did a boost leak test recently and I found that air was escaping out of my BOV recirculation tube. This is not supposed to happen is it?
The BOV is an authentic Greddy Type RS and I've messed with tightening and loosening the screw, but it still leaks out.
Could the BOV be bad? This would piss me off because this is the second brand new Greddy that I've had that has had problems!

Any info on this would be greatly appreciated. Thanks!

 

[DSMunknown]

Replace the recirculation tube.

There definitely should not be any air coming out of the BOV when performing a BLT. If you can replace the Greddy with another valve, such as a 1G RV, and confirm it's the Greddy then you'll have the cause. But it sounds like the valve isn't sealing properly. When you put the soapy water on, where were the bubbles exactly coming from?

You may also want to inspect your rubber diaphragm for rips.

 

[boostnhard]

I back up the diaphragm theory, because these BoVs are no longer made, I doubt yours is brand new unless its a knockoff(but you said it wasnt). So Im sure its your diaphragm, eventhough the one dsmunkown is showing you says its for a type S it will for sure fit the RS you have(I know from personal experience). If you need further help with the install PM me, Ill be glad to help!!!!!

 

[DSMunknown]

As far as I know, the diaphragm from either model are the same.

 

[SpiralOut]

I had the same prob with my greddy.

 

[ILLiCliPSE]

the recirc tube isnt leaking, the bov is leaking. the recirc tube obviously isnt the problem. your bov needs rebuilt, or you need a new one.

 

[snohacking]

I have had a few greddys do that on me. Never buying a greddy again

 

[CanadianTSi]

Is it a really big leak or just a slight leak? Alot of Greddy valves seem to have a slight leak...

 

[BOC Jason]

My first gen has the exact same problem. =/
Looks like an excuse for me to get the TiAL

 

[boostnhard]

As far as I know, the diaphragm from either model are the same.

If you read carefully youll see that thats what i said!

 

[Champ Masters]

Thanks everyone for the replies!

Thanks for the link DSMunknown. I'll inspect the diaphragm but it's a brand new bov so I don't know why there would be a problem.

Here is the bov I got from ExtremePSI and I also got the recirc adapter: EXTREME PSI : Your #1 Source for In Stock Performance Parts - GReddy Type-RS Blowoff Valve: Universal

The recirc tube itself is not leaking, it's when I boost leak test from the turbo inlet my intake is not hooked up so the boost is leaking thru the bov and out of the end of the recirc tube. There are no soapy bubbles coming from anywhere on the bov the air is just escaping out of the blue "horn" area on the bov.

Unfortunately I can't try a different BOV cause my intercooler pipe is flanged for the Greddy. To check if it's the diaphragm do I just unscrew the screws at the top of the bov and open it up?

Thanks again guys!

 

[DSMunknown]

If you read carefully youll see that thats what i said!

Just reiterating your statement.

Thanks everyone for the replies!

Thanks for the link DSMunknown. I'll inspect the diaphragm but it's a brand new bov so I don't know why there would be a problem.

Sometimes you're just one of those unlucky people. There have certainly been others who have had this diaphragm problem right at the start. If it is the diaphragm, others have taken some Permatex Ultra Black RTV silicone sealant and lubed it up to make a proper seal (you can find it at any NAPA or most automotive stores). You may want to try this first before spending ~65 bucks on a new diaphragm.

And don't even think about using any other than the Permatex Ultra lineup.

The recirc tube itself is not leaking, it's when I boost leak test from the turbo inlet my intake is not hooked up so the boost is leaking thru the bov and out of the end of the recirc tube. There are no soapy bubbles coming from anywhere on the bov the air is just escaping out of the blue "horn" area on the bov.

Unfortunately I can't try a different BOV cause my intercooler pipe is flanged for the Greddy. To check if it's the diaphragm do I just unscrew the screws at the top of the bov and open it up?

Thanks again guys!

Try putting lots of soapy water on the inside of the BOV. This way you can see if the bubbles are coming from the top or bottom of the inside of the valve.

Yes, just find an appropriate allen wrench and take off all the screws. I would loosen all the screws first, then back them out in a cross pattern. There are two springs in the center, so hold the top of the BOV down so it doesn't shoot up in your face or fall on the floor (scratches ).

 

[Champ Masters]

Great info DSMunknown, thanks a bunch!

I'll inspect the diaphragm and see what I can see. I'll give the RTV trick a chance and if all else fails, just order a new diaphragm. I must have the worst luck when it comes to Greddy bov's

Thanks again for the tips!

 

[DSMunknown]

You should be greatful that other vendors offer this part. A few years back, you would only be able to get these diaphragms directly from Greddy. And with their shitty customer service, it could take anywhere from several weeks to several months to get your clammy hands on a new one. Not to mention they were 80-100 bucks, not including shipping. So contemplating on getting another Greddy (or another CBV) was something to seriously consider.

 

[Strm Trpr]

You could call Tom at ETS and have him send you an IC Pipe that is flanged for a 1g BOV.
Meanwhile you can pull that POS off and inspect it.

 

[TalonJohn94]

There definitely should not be any air coming out of the BOV when performing a BLT.

I have this same slight leak (maybe a couple PSI) and I also have a "leak" from the boost controller when I do a BLT.

What is the point of this bleeder hole?

 

[r1991_4g63t]

how much is a couple psi? how much does it hold before it starts leaking? which BOV do you have?

 

[DougR]

Buddy. I have the exact same BOV and mine leaked horribly bad. Right out of the box.

I ended up pulling mine Completly apart. Polished everything inside to a mirror finish. Except the piston! its either anodized or nylon coated. So I just gently gave it a smooth buffing. Nuthing extreme, just smoothed it out..
Polished the brass piston seat so good it makes Gold look bad Then lapped the piston to the seat useing mothers aluminum polish.
Then used a hardening Silicon around the edge diphram. Top and bottom on the sealing edges...

Gave the entire thing a nice silicone spray lube and put it back together useing Tiny amounts of blue loctight on All screws...

It now holds 30psi with No leaks... been doing so for like 7 months. (Well it was bench tested at 30. Its currently running at 16.5 daily)

The greddy is actually a decent BOV. its QC is what makes it suffer... Once you clean them up and givem a good ol polishing. they work great.

 

[jenkinsfan1]

Type 1 HKS BOV thats all I am saying !

 

[TalonJohn94]

how much is a couple psi? how much does it hold before it starts leaking? which BOV do you have?

I don't know, its like a slight breeze coming out of the (stock 1g)BOV when doing a BLT.

I don't know how much it holds before air escapes, because the minimum my air compressor would go was 15 psi.

 

[jm1080]

Great info DSMunknown, thanks a bunch!

I'll inspect the diaphragm and see what I can see. I'll give the RTV trick a chance and if all else fails, just order a new diaphragm. I must have the worst luck when it comes to Greddy bov's

Thanks again for the tips!

The diaphragms are expensive, but I do have a brand new one that I was going to use on my greddy which I never ended up needing, so if you or anyone needs one pm me and I can sell for cheaper than 80-100.

 

[r1991_4g63t]

I don't know, its like a slight breeze coming out of the (stock 1g)BOV when doing a BLT.

I don't know how much it holds before air escapes, because the minimum my air compressor would go was 15 psi.

well i believe the stock 1g BOV only holds 16, so that might be normal?

 

[TalonJohn94]

well i believe the stock 1g BOV only holds 16, so that might be normal?

Oh, I thought the 1g held more. So I shouldn't tune for higher boost until I fix that, right?

 

[r1991_4g63t]

a crushed 1g BOV will hold a little more, but im pretty sure stock they only hold 16

 

[the_mork]

A 1g bov can hold quite a bit, it will depend on the individual piece but I've known them to handle 20psi without shrugging, crushed and dodge garage modded bovs can hold even more than that. I've just switched to a forge bov though and it holds beautifully.