Boost Leak Set up Question

[BOC Jason]

Alright, so i've read through gobs of thread trying to figure out exactly how to do a boost leak test. I got my coupler and clamps and my Tester itself from boostpro.net... Now what i'm wondering is how do i hook it up to the turbo compressor?

I know you have to remove the air intake pipe from the compressor and that the tester is supposed to attach there but there's not much room at all and the J-pipe's in the way...

Any advice?

 

[Gstclipse69]

I have boost leak tester from boostpro too. You need a 3" to 2" rubber coupler to connect the tester to the turbo. You can get one at lowes in the plumbing section. Its a tight fit but mine slides right on the turbo inlet just above the wastegate actuator.

 

[BOC Jason]

I went to Ace hardware and all they hard were an 3" to 3" and a 2" to 2" so i got those an just tried to make them connect and clamp it down but it didn't work. the rubber ended up folding and there's a place where air escapes...

 

[BOC Jason]

ok. I just got back from Lowes and i picked up the 3" to 2" coupling.
Now the only problem i have left is how to exactly get my tester and coupling attached to the turbo compressor without having the j-pipe in the way....

 

[Gstclipse69]

Well the j pipe is sort of in the way. What I do is take a socket wrench, put 2 long extensions on it with the socket usually 10mm, and I can grab enough of the clamp's hex to turn it and get it snug. Now while turning the clamp it has a tendency to want to swivel downward because of the pressure you're putting on it. What I do is take a flathead screwdriver and place it under the hex bolt you're turning to keep it in place so you'll have a space to access it instead of it moving all around. Hope that'll help.

 

[BOC Jason]

ok so i just did my boost leak test. when i went to put air in it it would put any more air in it over about 13 p.s.i.??

also i have my intake off so my BOV dump tube is open correct?

well after i pressurized the system there was air coming out of the dump tube spot on the BOV...what could that mean??

PLEASE HELP

 

[kanderson]

All it means is that the BOV won't hold more than 13 psi, which is kinda odd because you have a 1g BOV.

Make sure the vacuum line is attached to the top of the BOV because this helps it hold more pressure.

What does the pressure do after it drops down to 13 psi?

 

[BOC Jason]

I just put the air into the tester and it makes it's way up to 13 psi and then it just sits there and won't go any further. then i take the air off the tester and i feel air coming out of the BOV dumb tube spot... and the tester gauge goes back down to 0 psi.

 

[kanderson]

It leaks all the way down to zero psi? And the vacuum line is connected?

Clarification: it leaks the whole time, even when you are pumping the air in? not just after you stop pumping?

Sounds like your BOV might be messed up, does your car boost alright? Why did you decide to do the leak test in the first place?

 

[BOC Jason]

It leaks all the way down to zero psi? And the vacuum line is connected?

Clarification: it leaks the whole time, even when you are pumping the air in? not just after you stop pumping?

Sounds like your BOV might be messed up, does your car boost alright? Why did you decide to do the leak test in the first place?

It leaks the entire time while i'm putting air into the system.
And i noticed that my car doesnt pull like it should (specifically at higher rpms)
and i noticed that my turbo was leaking oil around the band clamp so i decided it could use a good boost leak test..

here's a picture of the turbo..
<a href="http://s258.photobucket.com/albums/hh276/JasonEyestone/?action=view&current=DSCN0283.jpg" target="_blank"><img src="http://i258.photobucket.com/albums/hh276/JasonEyestone/DSCN0283.jpg" border="0" alt="Photobucket"></a>

 

[kanderson]

If your are losing boost through the BOV, that would cause a lack of power. I don't know about that oil on the turbo though, doesn't look so great...

 

[BOC Jason]

i just re did the test and there's air coming from the BOV dump tube location and the BISS screw is letting out air and has bubble's on it from the soapy water as well.... Should that be?

 

[BOC Jason]

ok i learned that i probably need to replace the o-ring in my BISS screw but i'm still confused on the BOV dump tube. Isn't supposed to be closed when the car is off?

 

[Gstclipse69]

Yes you need to replace the biss o-ring. Lube it with some silicone grease to help prolong its life. The blow off valve dump tube should not leak air during a boost leak test. This means it can only hold 13 psi before it starts leaking. Search for "crushing 1g bov" or look in the tech articles. I think that should help.
Now, once you get to 13 psi how long does it take for the pressure to go back down to 0 psi? And where is the air coming from when your putting air in the system? I would fix the bov leak and biss, then boost leak test after that and see where your at.

 

[BOC Jason]

I can actually hear it leaking before 13 psi.. =/
and after getting up to about 13 psi it takes probably around 7 seconds to reach back down to 0 psi.