External Gate Setup

oldsmokey

oldsmokey

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Jun 28, 2007
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Ive got an Extreme Billet 40 mm gate with stacked springs inside. It takes about 65psi to the bottom of the gate to open it. This is with the truck off so no drive pressure. The way its setup now is with full boost to the bottom and nothing to the top and the primary is a little slow to light. Im trying to decide how to set the gate up? I have different springs so I could lower the spring pressure. Should I run drive pressure to the top? Regulated boost? Full boost? The way I see it if I run drive pressure to the top I would need to put in lighter springs as the drive pressure would be equilized. Correct? Im hoping to open start opening the gate around 25 psi. Anyone have any input to get me started?

Thanks Joel
 
If you run drive to the top it will be harder to open then with nothing going to the bottom. I would run drive to the top and get yourself a boost elbow or air compressor regulator to regulate boost to the bottom port. Gives a nice fine adjustment to when the gate opens. If you can't get it to open how you want it after running it as suggested then maybe swap the springs around.

If your primary is hard to light wouldn't you want the gate to remain closed to keep drive going to the primary or is your hot pipe setup such that drive vented from the gate goes to the primary?
 
My gate is pre seconday, then goes into the hot piping just before the primary. Im was kinda thinking the same as you. Running drive pressure to the top and lower the spring rate until I can open it with boost pressure. Right now if i run drive pressure to the top wouldnt I need 65 psi worth of boost to open it. As the drive pressure would level out on both sides of the gate?
 
oldsmokey said:
My gate is pre seconday, then goes into the hot piping just before the primary. Im was kinda thinking the same as you. Running drive pressure to the top and lower the spring rate until I can open it with boost pressure. Right now if i run drive pressure to the top wouldnt I need 65 psi worth of boost to open it. As the drive pressure would level out on both sides of the gate?
Click to expand...

Explain how you are testing. I.E. when you say 65 psi of boost opens the gate is that just off the truck with an air compressor?
 
Yah, truck off with compressed air. Im thinking that if i run drive pressure to the top the gate will act the same as it does with the truck off. With equal pressure to both sides. That would mean that i would need to drop the spring rate allowing the gate to open at lower boost levels. Basiclly opening the gate with boost pressure only as the drive pressures should be equilized
 
I see. Well go ahead and put some lighter springs in it, plum regulated boost to the bottom, unregulated drive to the top, and then do some testing by giving more boost to the bottom with the regulator to open sooner or less boost to the bottom to open later to get you close to your 25psi or wherever you want to be!
 
oldsmokey said:
Yah, truck off with compressed air. Im thinking that if i run drive pressure to the top the gate will act the same as it does with the truck off. With equal pressure to both sides. That would mean that i would need to drop the spring rate allowing the gate to open at lower boost levels. Basiclly opening the gate with boost pressure only as the drive pressures should be equilized
Click to expand...

An no, it won't act the same. With the truck off there is no drive going to the top port which does not give the springs any assistance in keeping the valve closed. With the truck on and drive pressure going to the top it will be harder to open the valve.
 
What about running pressure to the bottom, and regulate boost pressure to the top?

I don't have much experience with wategates, but my assumptions lead me to believe: Assuming the y direction is positive: The drive pressure and the lower pressure sum to produce positive force acting to open the gate. The spring pressure and upper pressure sum to produce force in the negative direction and act to hold the gate closed. In my eyes that means you want to limit the pressure to the top and allow the forces in the upward direction to be unregulated and open the gate.
But I may have absolutely no idea how the gates look internally.
 
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Different ways to skin a cat. That way could work as well. Each way has it's own unique set of things that are desireable and not. :)
 
I had mine setup a little different. I only used regulated boost on the top port and nothing on the bottom. The gate already has drive trying to push it open, so I used pressure on top to fine tune where I let it open. Works great, but only if you find the right spring for your setup.
 
I run unregulated drive pressure to the top, regulated boost to the bottom, and a fairly soft spring. Since the drive pressure is equal on both sides of the gate, it's just boost vs. spring pressure so it doesn't have much holding it closed and the boost controller tells it when to open.
 
But if that's the case and you regulate pressure to the bottom port then once you have exceeded the regulated boost pressure the gate would stay in the position its at. If for some reason the boost began to increase the gate would still stay in a fixed position and not open more. This does not seem desirable. At least without regulating the pressure to the bottom port the gate could continue to open. :what: Why regulate to the bottom port? its just the force generated by the bottom pressure vs the spring? What good would come from regulating the pressure?

Are all of the areas the same? If not that would change things a lot.
 
On our gates the area is not all the same. That is why we recommend running them the way Nick is.
 
if you go on the Tial site, being oen of the MOST recognized wastegates around - they show the proper way to hook up an external gate, and it is regulated boost to the top port and full boost to the bottom port - that way any size spring you wish to run will work

It is also claimed that runnin too high of a spring pressure is very hard to control with any precision
 
seeker1056 said:
if you go on the Tial site, being oen of the MOST recognized wastegates around - they show the proper way to hook up an external gate, and it is regulated boost to the top port and full boost to the bottom port - that way any size spring you wish to run will work

It is also claimed that runnin too high of a spring pressure is very hard to control with any precision
Click to expand...

Thanks
 
GRotman said:
On our gates the area is not all the same. That is why we recommend running them the way Nick is.
Click to expand...


I believe what Glenn means is the gate is 50mm and the piston is a different diameter.
 
Whos running their gate with full boost to the top and regulated boost to the bottom so drive pressure and regulated boost will open it. Just seems like it would work best to me atleast. I'd try to keep the soot fout of the top of the gate by not running drive pressure to it.
 
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