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How does the stock Boost controll system work on a 2G?

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Nitro413

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Discussion starter · #1 ·
Hey. I'm going to be installing my TurboXS dual stage controller. I've found there are a few different ways to do it. I figured if i new how the stock setup worked, that would help me understand things a bit better.

Who knows how the stock stystem works--with boost control solenoid, and the "y" tube connecting the turbo and the wastegate to the boost solenoid, and then that tube going back to the intake?

Thanks for the help.
 
#2 ·
This is how it works, to my knowledge.

You have a line coming from the compressor housing that runs to the boost control solenoid. This tells the solenoid how much boost the turbo is creating. This boost pressure then exits the solenoid and goes into the intake. Until you reach the point where the solenoid shuts off, which is about 12 psi stock, this path I explained is an open loop, which never lets the pressure back up and open the wastegate. When the solenoid does shut, then the boost pressure can't exit the other side of the solenoid, so the only place that it can go is into that Y tube that is connected to the wastegate, thus opening the wastegate.

I hope this helps.
 
Discussion starter · #3 ·
That helps quite a bit. Thanks.

When i hook up the TurboXS, i'll have the one tube coming from the Turbo housing and the other one going back to the wastegate. I know that there is another way to control boost by connecting the one tube to the wastegate and the other to that tube coming from the BOV. Where is that tube getting boost from? What does that tube do?
 
#4 ·
The line on the BOV also see the boost pressure at WOT because the turbo compressor compresses the air, sends it to the intercooler and then the intercooler sends it into the intake manifold, which is where that line from the BOV connects to. At closed throttle, that line sees vacuum and it helps open the BOV.

I would recommend just connecting the line from the compressor housing into the inlet on the XS control solenoid and the outlet on the wastegate. Don't worry about the line on the BOV...leave that connected to the intake manifold and don't tap into it. I mean, if you think about it, you should get better response this way since you are seeing the boost right when it is being created.
 
Discussion starter · #5 ·
Good point. Alright. I'll do that with the controller. As for the boost gauge, where should i tap that into? I know that about 4psi or so is lost between the turbo and the throttle body w/ the stock IC. So where is the best place to tap in the boost gauge for an accurate reading?
 
#11 ·
Ok, here ya go
www.taboospeedshop.com/emissions.htm
Look at the after pic and use the optional boost gauge source connection. Forget about the solid line the goes to the fpr and only use the optional as your feed. If you don't plan on removing your vac lines just T into the same spot rather than running a dedicated hose off the outlet ;)
 
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RippinGSX
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