EBC install: internal wastegate disconnected?

[raptoranderson]

I have a '98 Eclipse GST with a 20G turbo which has an internal wastegate. I have a GFB boost controller and just went to install it in my car when I noticed that it seems as though the wastegate is improperly connected ...

The pictures I have aren't great, but you'll see the nipple on the top of the wastegate is attached to a rubber hose which runs to the passenger's side of the car and attaches to some sort of black box which is also connected to the intake pipe via a rubber hose and then has a set of wires exiting from the bottom of the black box and running to the underside of the fuse box.

I thought the wastegate operated by using a pressure source? The intake pipe isn't under any load and isn't even a vacuum. Does this mean that the wastegate has been made useless?

 

[BestOfBothWorlds]

The black box is the boost solenoid located under the intake pipe on the passenger side of the car which is hooked up to your wastegate.

 

[raptoranderson]

The black box is the boost solenoid located under the intake pipe on the passenger side of the car which is hooked up to your wastegate.

How does the boost solenoid know when to open the wastegate? And how does it open the wastegate if it's not attached to a pressure source?

 

[BestOfBothWorlds]

From what I understand is the wastegate has a spring, when under the correct pressure, will open up the wastegate. So the intake to boost solenoid to wastegate depending on how much air is applied through the intake will let the solenoid know when to open open the wastegate.

 

[raptoranderson]

I'm saying that the wastegate doesn't have anything to force it open because there is no pressure being applied to the wastegate actuator. The vacuum line coming from the wastegate is what will have the air in it to push the wastegate open, but the vacuum line coming from the intake pipe won't be under any pressure since it's before the turbo, right? So where does the boost solenoid get the pressure with which to open the wastegate actuator?

 

[BestOfBothWorlds]

Ok my bad let me know if these pics help

 

[raptoranderson]

You're all good I'm just trying to figure out if hooking-up an electronic boost controller will actually do anything I suppose I can just hook it up temporarily and see if it makes any changes to the maximum boost and then if it doesn't to go from there

 

[1990TSIAWDTALON]

Hook the WG up to a boost source and leave the solenoid where it is, it just wont function.
If you want to try the EBC then place it in between the boost source and the WG and watch boost carefully.

 

[raptoranderson]

Hook the WG up to a boost source and leave the solenoid where it is, it just wont function.
If you want to try the EBC then place it in between the boost source and the WG and watch boost carefully.

What is the boost source though? The boost solenoid? And where does the boost solenoid get its boost source from?

 

[1990TSIAWDTALON]

Any port between the turbo and the throttle body....actually any port on the manifold but it is always suggested in the intake tract between the turbo and the TB. Sometimes you have to make a source. I had to drill and tap a hole in my compressor housing on my Holset to add a fitting just for that. You are correct that it won't work in the intake pre-turbo. The boost solenoid SHOULD have a hose that goes to the engine and one that goes to your WG, but you say it is in the intake tract before the turbo so that definitely won't work for the WG. Originally, it had a line from the engine to the solenoid then out to the WG. Obviously someone has done some "fine" work before you got the car like most of us find.

 

[raptoranderson]

So the turbo is pretty much hitting its maximum potential as is? So installing a boost controller won't do anything?

 

[1990TSIAWDTALON]

No, properly set up you will be able to increase boost. Do you have a wide band guage to monitor air fuels? Or a way to tune?

 

[raptoranderson]

I have a Bosch LSU 4.9 with a gauge and I'm looking into getting ECM Link V3 very soon. Along with a Walboro 255 fuel pump, 850cc fuel injectors from FIC and an AEM adjustable fuel pressure regulator

 

[GST with PSI]

Buy ECMlink and sell the EBC you have. ECMlink already has EBC as a built in functionality.

 

[92AWDHX40]

Great Marty nice post you running a ebc.

 

[raptoranderson]

Assuming my car has a stock ECU, would I need to buy a GM MAF cable or a non-EPROM socket conversion for ECM link? Also would I be correct in assuming that 850cc fuel injectors would be sufficient to provide fuel to accommodate a 20G turbo which flows 44lbs/min and around 20psi of boost?

 

[1990TSIAWDTALON]

Great Marty nice post you running a ebc.

MBC here Vic. Works ok up to my 38 lbs.