Real quick question on BOV during BLT

[razrman8]

I am doing a BLT right now. I took off the piping that connects the UICP to the TB and capped it off. So I can see if my intercooler system is holding air. Should thee BOV be releasing the air when building up the pressure. I would think so since the pressure has no where else to go. Just forces its way throught the BOV.. Simple question. Just making sure everything is correct

 

[gofer]

No. The bov should stay closed while its in boost and should ONLY open when its in vacuum... If the bov is opening while your building "x" amount of boost then it becomes a boost leak. Its either a faulty bov, the way you have the vacuum lines hooked up is wrong, or your building A TON of boost in the piping and its blowing it open.

 

[razrman8]

Wow. So I have a HUGE boost leak from the bov if its leaking when I pressurize it?

 

[MY1GDSM]

You shouldn't have to cap the end of an IC pipe before the TB either, You should be able to leave it one an test... If not do a BLT on the Intake alone and find your leaks their first...Your line from the Vacuum source to the BOV is pressurized when your Boosting so Technically speaking it helps keep the Bov close more as boost raises.

 

[gofer]

How many lbs are you able to build before it starts to open? Its also possible you have the vacuum lines wrong as well or doing the leak test wrong.

 

[razrman8]

Here's the video
Qikking away with my HTC Evo 4G | United States | By Keenan Willis (thorcr80)

I capped of the uicp because someone said itd be a good idea to see whether there are leaks from turo to uicp then from the tb on... I didnt see the harm. But to me, If you are forcing that air in, air has no choice but to force the spring on bov up and seep out

 

[donniekak]

By capping the uicp before the tb, you are preventing the port on the bov from seeing boost. This will cause the bov to open under pressure. Do a regular blt.

 

[skatershawn]

i once had this problem so i thought my BOV was bad and got a "newer" one.. the newer one didn't do it when i first installed it but started to slightly do it a few months later!

i asked around and people kept telling me it was fine for a little to leak.. still cant fiugre why it would be but i moved on! Glad to finially hear from another source its not good!

Time for a tial bov!

to the OP i would guess the bov diaphragm is bad, your bov spring is weakened or you lines are hooked up wrong!

 

[razrman8]

Alright normal BLT performed. My TB shaft seals are bad (already knew that have new one on it way) . Only thing other than that that I can hear is when I take off oil cap, I hear air. Im assuming its coming from the pcv .

 

[50trimgst]

Knock off tial leaks FYI tho not at first.

 

[donniekak]

Knock off tial leaks FYI tho not at first.

All bov's blow open without equal pressure applied to the port.

 

[razrman8]

You know. I wonder if its my MAF? Because I know if I had a boost leak that was affecting me that much. I would see or hear it. MAF would explain why the 16g is getting 2psi and the t25 was 7psi. Both different levels

 

[rlacasse1]

No, I don't think the MAF would cause that.

 

[razrman8]

I can't think of anything else it would be. I mean llike I said, I could hear the t-25 spool more than I can the 16g. It'd spool to 7, and the 16g "spools"(if you can even call it that) 2.

 

[rlacasse1]

Are you sure that the turbo is ok.

And have you checked all the vacuum lines.

And have you checked to make sure that there is no wastegate issue. Like making sure it is fully closed when just sitting there. You can disconnect the actuator arm and chekc that. Once you disconnect it move it back and forth and see if it is seating up, like it is stoppin against the hole it covers. If that makes sense.

 

[MY1GDSM]

Is you wastegate adjustable? how bad is your boost leak? Do you have any Exhaust leaks? Does your Turbo have any shaft play?

 

[razrman8]

I am sure that the turbo is good. The t-25 had a boost problem and the e316g is having a boosting problem. Wastegates fine on BOTH of them. And I highly doubt the 2 turbos are bad. The 16g has like 4k miles on it. I can't get any shaft play out of either. My boost leak is not bad at all. But I am getting a new TB its on its way, I believe. Theres just no way that this tiny leak is causing to me boost 7psi on t25 and 2 on 16g. Different psi. Different turbo. Something is happening and I'm clueless. I just dont know what else it can be.

No, the wastegate is not adjustable

 

[nek]

I dont get it... I was under the influence that if you capped off the uicp, then the bov would open because it doesnt have equal boost keeping it closed (caused from bov-intake manifold). If your only testing the uicp then the only thing keeping the bov closed is the spring, so once the boost pressure surpasses the spring force, the bov will open.

Also, I dont think any amount of boost leak will cause you to boost 2 lbs. Something else is wrong.
If your wastegate is stuck open, that would cause your boost to crap. Make sure your flapper isnt moving around by itself.

 

[razrman8]

I dont get it... I was under the influence that if you capped off the uicp, then the bov would open because it doesnt have equal boost keeping it closed (caused from bov-intake manifold). If your only testing the uicp then the only thing keeping the bov closed is the spring, so once the boost pressure surpasses the spring force, the bov will open.

Also, I dont think any amount of boost leak will cause you to boost 2 lbs. Something else is wrong.
If your wastegate is stuck open, that would cause your boost to crap. Make sure your flapper isnt moving around by itself.

Just disreguard the the uicp cap off part. Its not a wastegate problem I am sure of that. I checked both of them. With o2 housings off of both of them.

It it was a wastegate problem, since my wastegate seals off, itd have to be something forcing my wastegate open. Which would be anywhere 10+psi, and Im not even building that. I am building 2psi, which isnt anything. If it is, not saying it is, a boost leak, why would the t25 boost 7 and the 16g boost 2. Why are they different? What would be making a difference? Ported 16g? I dont know

 

[rlacasse1]

Honestly, it really sounds like a wastegate issue.

So you're positive that the wastegate is naturally closed. Cause it really sounds like it's just hanging open.

Where did the actuator come from, is it new?

 

[razrman8]

The actuator is the one that was on the turbo.

1 car+ 2 different turbos= same problem

I'm just lost

 

[BoostedBeater]

Are you sure the wastegate isn't getting hung up on something? Could've been fine when you installed but failed to seal since.

What is your vacuum setup to your wastegate? Please list the entire path.

Have you tried testing force needed to move the wastegate arm?

 

[MY1GDSM]

Why aren't you using the wastegate that goes to the 16g? Did it just not come with one?
They aren't the same they don't even bolt up the same way... I'd say defiantly a wastegate Problem, try shimming it so it has more pressure on the W/g Flapper Arm.

 

[razrman8]

I am using the wastegate that came with the 16g. I didnt take it off of the t25.

My vacuum lines are like so.
*bottom line of BCS runs to j-pipe nipple And that line there is t'd off and that line that is t'd off goes to wastegate actuator
*top line of bcs goes to the intake

 

[zanderson]

My 1g had a good size boost leak out of both of the TB seals, they weren't huge, but they were good sized. Put on another tb and that ended up leaking as well. On my 14b I would spike to like 6 psi, then it would just drop right away.