stock intake tube, how many tubes connected?

[chelfy]

I'm on the 2nd day of my 14b install on my 2g, and I was careless and don't remember which vacuum lines go where on the turbo and intake, and i remember there being a nipple on the bottom side of the t25 that doesn't exist on the 14b. if someone can point me in the right direction i would be very grateful. I hate trial and error!

 

[DSM4me44]

That nipple that was on your T25 is actually non existant on a 14b. If you have the factory j pipe that goes on the 14b, it has a nipple on it. That takes the place of the one that was on the T25.

Your profile doesn't list any mods such as a MBC so im guessing this is the way you need to set it up.

The vaccum line that goes to the nipple on the J pipe needs to go to the boost control solenoid. Then a line from that goes to the wastegate actuator.

Cap the little nipple off on your intake.

Let me know if this makes sense.

 

[chelfy]

on my stock intake the only thing i'm confused about is the hole on the underside, which is very small. i don't remember if i removed tubing from it or what. is that what you're talking about when you say cap the nipple off because i don't have any nipples on my stock intake and i can't think of a way to "cap" the hole.

 

[Burnett03]

Ditch the boost control solenoid.

 

[chelfy]

ok, after looking further i noticed there is a nipple down by the lower engine mount that i apparently disconnected something from as well. What the hell is that, it looks like there is a solenoid by it and thin metal tubing running up somewhere else. ahh!

 

[Defiant]

http://www.dsmtuners.com/forums/showthread.php?t=188631

 

[chelfy]

ahh, great! thanks everyone!

 

[Mr Peepers]

The vaccum line that goes to the nipple on the J pipe needs to go to the boost control solenoid. Then a line from that goes to the wastegate actuator.

Just clarifying, do not set the BCS up like this.

The BCS is in the closed/blocked position when there is no power going to it. When the car is started there is power sent to it and it opens, allowing boost to build when the WGA is closed. Under normal conditions, when the ECU sees a certain psi it will shut off power to the solenoid making it close again, and allow the wastegate to open. This is how boost is controlled from the factory. See attachment below.

If it's set up like a MBC directly between the J-pipe and WGA, the BCS will be open when there is roughly <10psi. This will make the wastegate slowly open once it sees enough boost to overcome the spring pressure and exhaust gas pushing on the flapper, essentially acting like a line directly connecting the J-pipe and WGA.
Let's say the WGA only moves 3/4 of its travel by the time it hits ~10 psi. The ECU will then cut power to the BCS like it normally would, but instead of allowing pressure into the WGA like a stock setup, it will act like a valve holding that 10 psi in, also not allowing any more pressure to the WGA. If the car reaches 10 psi at 3k rpm, and keeps climbing in rpm, the WGA would need to open the flapper farther and farther as rpm increases to hold the balance. It cannot do this since it's now being blocked by the BCS and will most likely creep since it cannot use its full range of motion(limited by whatever psi the ecu cuts power to the BCS at).

So, hooking up the BCS directly between the pressure source and WGA will make it act like a line running directly to the WGA before full boost is reached, and be more prone to boost creep. Putting it back to stock or running a line directly to the WGA will be more useful.

-Matt

 

[chelfy]

Hey guys, did a 14b swap on my 2g, when i was putting everything back together i noticed was a small hole on to bottom side of the intake tube and that i had nothing to plug into it. it is connected to the bov, valve cover, and bcs. what is the other hole for, smaller than a pencil? did i forget something!?

 

[daves06r1]

You should have three ports on your intake tube. Well four if you count the big bov port. The small one towards the front of the car would go to the factory bcs. There are 2 bigger ones on the back side of the tube one is evap canister and the other goes to the side of the valve cover. The hole is there because the nipple for the line has come out. You can get them at any parts store.

 

[kmoore]

The stock intake has 3 "nipples" connected to it

 

[Mr Peepers]

The tube just behind the MAS in the intake would originally be connected to your BCS. If you have a MBC then plug this hole off, you don't need it anymore.

 

[chelfy]

thanks everyone for your replys. I figured out what was making me so confused, i didn't see the tube running to the evap canister. cheers!

 

[chelfy]

thanks everyone. everything is up and running fine.