External wastegate controller idea

carcrafter22

carcrafter22

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Oct 24, 2007
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I have been searching for a while now and cant find the exact info I am looking for.

I want to hook an in cab boost controller so I can tune on the fly.

I have looked into the cheapo ebay boost controllers, homemade adjustable valves etc.

In searching here on comp d I found a thread that mentioned using air regulators like used on air compressors but the thread didnt mention much more about them. I like the regulator idea but after calling JGS tech support I am only more confused since he was no help and said it may or may not work. I know you guys will be able to help so here I am.

Can anyone explain the best way to hook up an in cab boost controller for my JGS 40mm external wastegate so I can tune the twin turbos on my truck?

Right now I have the bottom port on the wastegate ran into the compressor housing on my secondary turbo (turbo bolted to the header). The top port is open.

Here is a pic of what it looks like right now.


Thanks
Randy
 
i just used a small air compressor type air regulator, and for lines used 1/4" plastic fuel line and the attendant fittings

Works extremely well

I can take pix for you once my truck is back together or as it goes back together - as right now it is a bare frame getting painted and detailed
 
pics would be great but I am wanting to get this done tomorrow since I hope to have my pump back next week and I want to be driving as soon as I get the pump on.

I stoped at lowes earlier and looked at a small regulator they had with 1/4npt ports, I guess that would work?

How did you plumb yours? did you just run a line from the intake manifold to the regulator then from the regulator to the top port on the external gate?
 
I may be lying to you but from what i have gather using other gates. You need to plum the drive pressure into the top of the gate. this allows equal pressure on the back side of the gate as on the front side. This equalizes the valve. By adding boost to the bottom port it you can fine tune when it opens by using a regulator. Add a little bit of boost at the bottom port o the gate you help blow the valve open.
 
Run a boost line into the cockpit, use a cheap flow control from northern tool (found a thread with one on here last night.) with a check valve plumbed into the line parallel with the flow control but flowing the opposite direction. Outlet plumbs to the wastegate. Boost comes into the flow control, also seating the check valve, actuates the wastegate when you want it to. Boost drops off the inlet side, rather than pessure coming from the wastegate back through the flow control, it flows through the chewckvalve, instantly dumping the pressure from the wastegate diaphram. (why can I not spell that word)

I can provide a schematic drawing tomorrow.


Scratch all that, this thing has unrestricted relief:

http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_200336350_200336350

You could put in a check anyway just for the quicker relief
 
from the "intake" manifold you run one line directly to the bottom port of the wastegate, then from the manifold you run a second line to the air regulator and from the regulator to the top port on the wastegate

It is the regulated boost plus the wastegate spring that is your adjustment for wastegate opening

I dont think that the way you have the current setup comin off of the one turbo will allow you to tune it properly because your not gonna see full boost at that location
 
Just use a air compressor regulator and I plumbed full boost to the top and regulated boost to the bottom and the drive pressure and regulated boost can control how much it opens.
 
I went to northern tool and bought a regulator good for 250psi and some small brass fittings, I wound up rerouting the lines so the line from the compressor goes to the top gate port and the line from the intake goes to the regulator then from the regulator to the bottom gate port. How does that sound?
 
seeker1056 said:
I dont think that the way you have the current setup comin off of the one turbo will allow you to tune it properly because your not gonna see full boost at that location
Click to expand...

i agree, dont you have to move the line going into the bottom wg port (in the pic) to the other side of that turbo?
 
I am using that spot in the turbo because it is where the stock wastegate got its boost reference from, I figured this would be fine is it not?

Do I need to run another line from the intake manifold to the bottom of the wastegate? I really dont want to but will if I have to.

Here is how it is now after changing the lines around and installing a new line in the intake manifold so I could run regulated air to the bottom of the gate.

 
couldnt see it good in the first pic - looks like it would be reading full boost to me - right where it is

that motor has a lot of 'stuff' hangin off the left side of it dont it...
 
Yeah sadly it does LOL. I wish I could have stuffed the hx52 on the passenger sidebut then I would have had to move the motor over to the drivers side about 2 " to get clearance.
 
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