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Is it better increase boost by connecting the solenoid to the bottom port and limit the compressor signal OR is it better to have the solenoid direct the signal to the dome? I know both work, just wondering which is more effective in terms of overall response.
Currently hooked to the bottom and works great but I am curious.
On top while leaving the boost reference unaltered on the lower should be the most stable with good resolution
I agree, though this won't give you near as wide of a boost window without on board air. Which might not be a concern depending on boost level he wants to run.
I use a 3 port solenoid. With no power it allows all the boost to the bottom port and none to the top. As it pulses it slowly limits flow to the bottom port while allowing more air to the top. When it's 100% closed it allows no air to the bottom and 100% to the top.
With a 3 port solenoid and no on board air this will give you the largest boost window. I can run 8-25 lbs this way... Sure I can run more but haven't tried more DC at this point. You do need a small bleed hole for the top chamber when plumbed this way.
I just have the solenoid hooked up in between the line from the compressor to the bottom of the gate right now and have a very smooth boost line as viewed on the logger...its nice and flat whereas before with just a line hooked up and no controller I had a slightly falling boost line. Right now running a 7psi spring and so far at 50% DC I'm getting 14psi. Not sure how much is left with this spring and more DC.
forcefed, what spring are you running in the gate with your setup?
No idea really. 2 springs came in the 38mm EMUSA "mini" WG. I took out the smaller of the 2 in each of my gates. Nets me about 8lbs with the bottom gate reference plumbed in.
Originally Posted by ryanleiker
How big is a small hole?
Bout like that...? No idea, I just grabbed one of the tiny carb jet bits and went with it. I'm super scientific...
If you're set up to the bottom of the gate and have a 7 psi spring and you're seeing 14 psi, it doesn't sound like your 50% duty cycle solenoid is doing anything. You're doubling spring pressure which is often the case with nothing hooked to the gate.
If you're set up to the bottom of the gate and have a 7 psi spring and you're seeing 14 psi, it doesn't sound like your 50% duty cycle solenoid is doing anything. You're doubling spring pressure which is often the case with nothing hooked to the gate.
is def doing something...with 0% DC I got 7psi and boost went up incrementally with DC up to where its now. Now, I have 2 waste gates, not sure if that has any influence on anything.
just wondering if anybody tried each scenario and noticed a difference in spool-up, smoothness etc. Just trying to save some time.
And again it isnt as simple as that because there are other factors at play.
How efficient is your system, what spring are you using inn the gate, what range of control do you need, is EGBP a concern, how good is whatever controller you are using ?
The latter being a vital part of the equation. Not all controllers are equal ! Some are pretty much *****, and then there is the aspect of actually configuring the controller correctly...and as countless threads here show, many struggle with that !
Every one of the above things is a variable, each one has an effect on the other so there is no simple answer to what you're asking.
Ok, sounds like the solenoid is normally open. So at 0% you're getting full compressor pressure to the bottom which then gives you your spring pressure. At 50% it must not be able to do much of anything to help open the gate which in turn is doubling your sprig pressure.
I agree, though this won't give you near as wide of a boost window without on board air. Which might not be a concern depending on boost level he wants to run.
I use a 3 port solenoid. With no power it allows all the boost to the bottom port and none to the top. As it pulses it slowly limits flow to the bottom port while allowing more air to the top. When it's 100% closed it allows no air to the bottom and 100% to the top.
With a 3 port solenoid and no on board air this will give you the largest boost window. I can run 8-25 lbs this way... Sure I can run more but haven't tried more DC at this point. You do need a small bleed hole for the top chamber when plumbed this way.
I can achieve the same results with my leash on air. control on top side
Ok, sounds like the solenoid is normally open. So at 0% you're getting full compressor pressure to the bottom which then gives you your spring pressure. At 50% it must not be able to do much of anything to help open the gate which in turn is doubling your sprig pressure.
yeah I can blow through it when its off. I'm gonna up the DC a bit to see if there's anything left in her.
I just have the solenoid hooked up in between the line from the compressor to the bottom of the gate right now and have a very smooth boost line as viewed on the logger...its nice and flat whereas before with just a line hooked up and no controller I had a slightly falling boost line. Right now running a 7psi spring and so far at 50% DC I'm getting 14psi. Not sure how much is left with this spring and more DC.
The only way to find out is to try it. There is no magic formula simply because there are so many variables.
Hell, even pipe sizes to/from solenoid/gate can make a difference, as can type of solenoid, as can how you configure the solenoid, as can where the reference signal for mthe solenoid is taken from etc.
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Top or bottom of wastegate for boost control 
