Quick question: Blow off valve

[davidreckless]

My blow off valve flutters, what should I do?
I've tried tightening it, it's pretty hard to do, but I did it as tight as I could without breaking the bolt off, then backed it off half a turn.
It is a type-s blow off valve by the way.

 

[my dreamt dsm]

You gonna have to tap the bov to a pressure source. The nipple that is coming from the back of the bov. Regardless of what people will say, it'll help. I know, it worked for me! Good luck!
And if you have a boost controller tap it to the pressure source! A little flutter is okay. It's surge you don't want!

 

[gofer]

Your vacuum line coming off the bov needs to go to a source located on the the IM and NOTHING should be tapped into it.

 

[my dreamt dsm]

The main hole from the bov goes to the manifold. But the type s flutter's a lot. You will decrease that flutter if you tap the back nipple of the bov to a pressure source.

 

[davidreckless]

Awesome I appreciate the response guys! I'll give it a shot right now.

 

[castrodsm7]

the harder u do the bov the more it will flutter..and the bov line make sure it is on the intake mani and to the bov and there is no air coming in from no where else and no air coming out..that will be a boost leak and make different sounds.

 

[my dreamt dsm]

Awesome I appreciate the response guys! I'll give it a shot right now.

Give it a shot and get back to me. I racked up the info from hours of research on the web and on tuners. I gave it a shot and it work. You won't get rid of the flutter 100% but you'll get like 1.
It also depends on how much you boost from what I read but haven't found if it's true or not. The lower your boost the more flutter! You can only adjust the type s so much to an extent that you wish you could extend some more! People tried many things but I racked up that this was how many got rid of it.
I might get ridicule but I'm sure not all bovs are made equal

 

[davidreckless]

It worked! Hooked it to the manifold instead of the wastegate and it makes that legendary screech! Also hooked another hose up and my idle is much more smooth. I had people thinking I had non-stock cams there for awhile ;]

 

[my dreamt dsm]

Cool. But I'm curious on how you hooked it up! Didn't feel like it was what I mention, !

 

[davidreckless]

I just ran the hose from the bov nipple to on on the intake manifold.

 

[crash89]

Ive got my type-s from the nipple to the IM and mine still flutters. I love it!

 

[gofer]

The reason why the bov needs to be sourced directly at the IM is because you want it to open immediately when you go into vacuum and close immediately when you go into boost. Both vacuum and boost are controlled by your throttle position which is off of the throttle body, if its tapped into anything else it won't respond immediately so it flutters and sounds like party favors or a turkey gobbling.
You should not only notice the flutter disappear but the car should go into boost a lot better as well.

There are (3) things in a turbo setup that you want connected directly to a vacuum/boost source with NOTHING tapped into them or else they won't operate as advertised.

• Blowoff Valve off the IM
• Wastegate off of a IC pipe close to the turbo or the turbo's compressor housing (this includes a boost controller if you have one)
• Fuel Pressure Regulator of off the IM

 

[davidreckless]

Just took her out for a drive, and it works great. One thing I did notice though is that I hit 22lbs. Is this normal? I'm running a 13b on stock internals. Arent they supposed to stay at stock without an MBC?

 

[sexystover]

you have a vacuum leak at your wastegate line then, your wastgate line should run from the wastegate to the intercooler piping or the turbo boost source

 

[davidreckless]

What do you mean by turbo boost source?....do you mean the intake? I didn't even have a line connected before and just connected it from the wastegate to the intake and it still does the same thing (22lbs).

 

[zanderson]

Wait, you connected your wastegate line to the IM? And just curious, why do you have a 13b on a 2g? That's a downgrade even from the crappy t-25

 

[gofer]

This stuff isn't rocket science but it can be a bit confusing until you understand how everything works in the setup your running.
To the OP, where is the vacuum line connected to coming off of your wastegate actuator (WGA)? Essentially, the wga is a boost controller but its not adjustable unless you change it internally. The stock wga will open between 10-12lbs to control the amount of boost you build, without having it hooked up properly it will remain close because it doesn't know when to open.


To jnf63, this threads resolved because he fixed the flutter issue so I don't think your jacking the thread. Typically using the second nipple on the back of the Type-S isn't necessary, the flutter your getting could be because you have something else tapped into the vacuum line going to the IM such as the WGA or the fuel pressure solenoid/regulator? If this isn't the case and you want to try running another vacuum line to the back of the bov then welding up a nipple on a IC pipe isn't necessary either. All you need is a few tools and a vacuum fitting and it can be done in your garage in just a few minutes.
The tools you need to get the fitting into the IC pipe are a 1/8" to 1/2" step drill bit, drill, and a tap set. Any vacuum fitting will work really and can be bought a Home Depot or any car parts store, I suggest getting a 1/8" NPT vacuum fitting similar to the one pictured below. Then just drill and tap a hole in your LICP and thread in the vacuum fitting (use RTV on the threads) and put the pipe back on and connect your vacuum line to the bov.

Heres what a step bit looks like...

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Heres what the 1/8" NPT fitting looks like...

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[davidreckless]

Wait, you connected your wastegate line to the IM? And just curious, why do you have a 13b on a 2g? That's a downgrade even from the crappy t-25

The car came with the 13b, it was $900 and all that was wrong was that it threw timing, so I can't really complain.
And I connected wastegate to intake pipe, not manifold, just because I misread something on here.

This stuff isn't rocket science but it can be a bit confusing until you understand how everything works in the setup your running.
To the OP, where is the vacuum line connected to coming off of your wastegate actuator (WGA)? Essentially, the wga is a boost controller but its not adjustable unless you change it internally. The stock wga will open between 10-12lbs to control the amount of boost you build, without having it hooked up properly it will remain close because it doesn't know when to open.

Well Gofer, I connected it to the BCS underneath the intake pipe. I'm doubting that's right. Then again I'm not sure, because most people around here don't run with it connected since they run with an MBC. And My keboard messed up and I meant to put that I have a Type-RS BOV so it only has one nipple.

By the way, I no longer have flutter. Thanks Gofer!

P.S. I fixed the problem, hooked wastegate up to vacuum source and now its sticking at 10 PSI. Bitter sweet. Im safe . But I miss 23lbs.

 

[davidreckless]

Oh you definitely helped! I appreciate any input, it might not have been what I need right now, but you never know when a friend of mine or a fellow dsm'er will need that exact advice.