V1 Nukers City Goblin - 2009 SS/TC number 2 build

[Zoom Zoom]

Picture 1 on intake hooks up like this, You need for that big Z54 turbo to work

 

[TheNuker]

What is that piece on the intake called, and what does it do? And where does it go after it comes out? So I see the nipple on the intake manifold goes into that black box, which I have, then it goes out of the black box into some solenoid or something, then out to where?

Thanks,
Nuker-

Picture 1 on intake hooks up like this, You need for that big Z54 turbo to work

 

[Desert Sasqwatch]

The black box is a vacuum reserve tank.

 

[Zoom Zoom]

What is that piece on the intake called, and what does it do? And where does it go after it comes out? So I see the nipple on the intake manifold goes into that black box, which I have, then it goes out of the black box into some solenoid or something, then out to where?

Thanks,
Nuker-

To the turbo, the yellow looking connection

 

[TheNuker]

But it looks like that hose is attaching to some kind of part on the intake, What is that part and what does it do? I'm assuming after that part in the intake top that it connects to the hose goes to the part on the turbo thats tanish plastic color with nipple pointing towards passenger side?

Nuker-

Ugh this never freaking ends i'm always missing parts.

 

[Northshoresaint]

But it looks like that hose is attaching to some kind of part on the intake, What is that part and what does it do? I'm assuming after that part in the intake top that it connects to the hose goes to the part on the turbo thats tanish plastic color with nipple pointing towards passenger side?

Nuker-

Ugh this never freaking ends i'm always missing parts.

Here’s what I know:
The part on the top of the intake is the turbo bypass solenoid. The tannish plastic part on the turbo is the bypass valve. The black tank is a vacuum reservoir.
Other model cars that use the LNF don’t employ the vacuum tank, the bypass solenoid tube that goes to your vacuum tank is connected directly to the intake.
So the solenoid switches from the intake (vacuum when throttle is closed) to atmospheric pressure (or nearly atmospheric) to actuate the bypass valve.
Here’s what I don’t know:
When does the solenoid actuate the turbo bypass?
Why does it actuate the bypass?
I’ve searched other forums and can’t find much info except that many have deleted the vacuum tank because it’s prone to leaks.
The LNF crate engine I purchased does not have the vacuum tank.
Here’s how it’s connected on my engine:

 

[Ross]

Most turbos have an electronic boost regulator (probably built into the Cobalt ECU) while others just have a limiting spring.
A boost controller controls the amount of pressure going to the wastegate.

 

[Northshoresaint]

Most turbos have an electronic boost regulator (probably built into the Cobalt ECU) while others just have a limiting spring.
A boost controller controls the amount of pressure going to the wastegate.

The turbo bypass valve is a separate system from the waste gate and boost controller. When open, the valve bypasses the compressor section of the turbo. Possibly so that it spins up faster? Or spin down faster?

 

[Ross]

Here is an article on blow off valves/bypass valves. It explains what they do.

 

[TheNuker]

Where does the hose to the Df supplied fitting go in your picture?

nuker-

 

[TheNuker]

Okay I ordered the part that goes on the intake. My gosh this better be the last **** part I need.

Genuine GM Solenoid 12633355 | eBay

Your use and browsing of this parts catalog is at your own risk. Cancellation Policy. We cannot take back installed or tried parts. We cannot take back used or parts.

www.ebay.com

 

[TheNuker]

Here’s what I know:
The part on the top of the intake is the turbo bypass solenoid. The tannish plastic part on the turbo is the bypass valve. The black tank is a vacuum reservoir.
Other model cars that use the LNF don’t employ the vacuum tank, the bypass solenoid tube that goes to your vacuum tank is connected directly to the intake.
So the solenoid switches from the intake (vacuum when throttle is closed) to atmospheric pressure (or nearly atmospheric) to actuate the bypass valve.
Here’s what I don’t know:
When does the solenoid actuate the turbo bypass?
Why does it actuate the bypass?
I’ve searched other forums and can’t find much info except that many have deleted the vacuum tank because it’s prone to leaks.
The LNF crate engine I purchased does not have the vacuum tank.
Here’s how it’s connected on my engine:
View attachment 22121

So I'm guessing the "To DF supplied fitting" means that it goes to the intake brass barb?

Thanks guys!
Nuker-

 

[Northshoresaint]

Where does the hose to the Df supplied fitting go in your picture?

nuker-

So I'm guessing the "To DF supplied fitting" means that it goes to the intake brass barb?

Thanks guys!
Nuker-

To be honest, I haven’t installed the intake piping yet, so I haven’t identified exactly which brass barb it connects to. I think I read where the valve cover nipple fits on the MAF tube and the tube in question fits on the MAP tube.

 

[Northshoresaint]

Here is an article on blow off valves/bypass valves. It explains what they do.

Wow, thanks Ross, that explains it. So I guess the vacuum reservoir will get the Bypass valve open before there is actual vacuum in the intake manifold. Interesting that only Cobalt LNFs have them. With an upgraded turbo, it’s probably more important.

 

[Zoom Zoom]

The black box is a vacuum reserve tank.

I have the vacuum

Where does the hose to the Df supplied fitting go in your picture?

nuker-

picture for you, if you need any more while I have engine out let me know

 

[Zoom Zoom]

The black box is a vacuum reserve tank.

I have the vacuum reserve hooked up do I need it with my Z54 turbo,

 

[TheNuker]

I have the vacuum

picture for you, if you need any more while I have engine out let me know

Perfect thank you, This better be the last part i'm missing hahahaha I want to start this **** thing and see if it blows up or not

Nuker-

 

[Zoom Zoom]

In section 144 up in the 2nd picture I showed not to cap that nipple off as you can see I did and the boost doesn’t work if you cap it off , just leave open

 

[TheNuker]

Started on piping, going to move to 2.5” on the cold side due to clearance issues.

nuker-

 

[TheNuker]

Going to redo all of that piping tuesday, it looks like **** LOL.

On another note, What is the thread size on the brass nipple on the DF supplied LNF lower charge pipe that the TMAP goes into?

Thanks,
Nuker-