Downpipe/wastegate questions

[GangsterMD]

Ok so I got a new turbo and downpipe, and the downpipe has 2 air line hookups on it. What are they for? I assume one goes to the turbo, and the other must be for the boost controller - which I don't have yet? So can it be used with the stock setup? How do I adjust the boost? I assumed when I bought it that there would be a manual adjustment like the stock style actuator... Man there's a lot to learn on these cars

[3.8vsix]

Hook it up like this. Just buy a air compressor regulator (like a sears, etc) Works great like this.

[charlief1]

I'm jealous but I'll have mine soon enough.

[RUQWKNF]

Originally Posted by 3.8vsix

Hook it up like this. Just buy a air compressor regulator (like a sears, etc) Works great like this.

That setup will work, but over the years, I have found that hooking up the lines this way has led to a more stable boost control for me.



Basically splitting the pressure source evenly on the Tee.
Not trying to disagree, just showing what's worked best for me.

Patrick

[3.8vsix]

I will try that, thanks!

[GangsterMD]

You guys are awesome, I'd never of thought of that... So after the pressure hits whatever the regulator is set to it bleeds the air off and into the back side of the wastegate air diaphram? Then what do I do with the stock electrical plug?

[3.8vsix]

Just leave it pluged up, so it will not set a code. Then hide it in the engine compartment if you want.

[GangsterMD]

Ok so I've been trying to imagine how to hook up the regulator. I see that you have plugged a port? Can you help me understand how it works?
Thanks again,
Darren

[pacecarta]

stock wastegate solenoid can be removed , unplugged will not set any codes with a tt chip

[RUQWKNF]

Theory of operation for most external wastegates:


Boost reference signal from the turbo/intake manifold, gets divided equally at the tee. With the bleeder valve closed, all signal pressure goes to the bottom of the wastegate and boost is regulated by whatever spring you have installed in the wastegate and the tension set by the adjustment screw. (if it has one) Once the exhaust pressure flowing through the wastegate overcomes the spring rate, the valve opens and exhaust velocity is decreased and stabilized. Thereby controlling the speed that the turbine wheel and compressor wheel spin at.

Once you open the bleeder valve, it allows the pressure signal to reach the top of the wastegate. This effectively increases the spring rate of the wastegate. The more boost reference signal you add to the top of the wastegate, the more exhaust pressure is required to open the wastegate valve. The more exhaust pressure that hits the turbine wheel, the more boost pressure is created by the compressor wheel. (IE: Turbos rotating assembly spins faster) Typically, with the air compressor style bleeder valves, you can double whatever the spring rating is. (Ex: If your wastegate spring is 15psi, you should be able to reach 30-32psi with the bleeder valve fully opened) Note: Actual final boost level can vary, due to different motor and parts combinations and ambient conditions.

With the Sears air compressor bleeder valve I have pictured, there is a direction of flow arrow cast into the body. You need to make sure that this arrow is pointing towards the wastegate only. Also, the side port in the bleeder valve is for a small gauge that comes with the valve from Sears. They also include a 1/8" NPT allen head pipe plug if you choose not to use the gauge. If you install the bleeder valve inside the center console or under the dash, that gauge is useless.
Hope some of this helps a little.


Patrick

[GangsterMD]

That's starting to make sense, after I read it a couple of times... Thanks Patrick!