3 Port and "3 Port Like 4 Port" Boost Demo With 3 Port Mac Valve

all right so this video I'm going to cover hooking up a three port boost controller 3 Port Mac valve used for boost control and I'm also going to cover three port like four ports it's using a three port valve to get it to work like a four port where you can get more out of your spring pressure so there's just something I want to clarify before I get into the video I set up a tune that I can control the boost controller with throttle position [Music] all the way to all the way on I just want to be clear that I'm not saying set your Boost controller up based on throttle position I'm just saying that I had it set up this way so I can reach it and I have a way to control the solenoid so I wanted to cover that because I know there'll be guys that are like oh that's a really dumb way to do that uh this isn't like control strategy it's just like how to do the plumbing so I'll go over both methods actuate the wastegate and then I'll show a data log at the end to compare the difference between 3 port and three port like four port okay so I was hooking up the Boost controller on the truck and I decided I'd do a little boost control video using a three-part Mac valve and an old wastegate so this is a 60 millimeter wastegate I have the feed line coming from my compressor this would be basically like your boost reference from your intake manifold or your compressor housing on the turbo I have one line going to the bottom of the wastegate and then one line right now going to the top of the wastegate and this would be like a typical traditional three port boost control setup just as an example I'll turn the compressor on and you can watch the wastegate move foreign is I'm getting air coming from the compressor it's going to the bottom of the diaphragm on the wastegate and it's lifting up the valve so now as I actuate the throttle it will take air from here and it will start to feed it onto the top of the gate so before we go into more detail on that I want to talk about how the solenoid actually works because I think that's an important piece of it and may help people understand this whole thing a little bit better now I have the solenoid set up so I can just manually turn it on and off so what I want to talk about is how the circuitry in here actually works so you have a number one the right side here is Port one this one is Port two and the center is Port 3 which is event on Port one if you actually look inside here there's a little screen on the inside of here so another way to look at this is normally open or normally closed so there's a normally open circuit and a normally closed circuit if you look at how this is plumbed right now into number one this is a normally closed circuit so if I apply air to Port one there is no error flowing through the solenoid when I turn the solenoid on or I give it power it goes to open and it passes air through the solenoid from one to Port two so it flows it through this way so if I switch the ports over to Port two we now have air flowing through the normally open circuit and then if I apply power to it it switches to where it's coming out this side over here so now you have a hundred percent of your airflow coming out here solenoid activated you have a hundred percent of your airflow coming out here air hook back up to Port one normally closed give the solenoid power it passes air through the solenoid so when you have air coming in from your turbo or your intake manifold over over here you want to be able to actuate the solenoid and then send air through Port 2 to the top of the wastegate and that's where your vent comes in so Port three import two this circuit here is normally open so this also acts like a vent so when you send air through the solenoid this way it will send it to your wastegate but then when the solenoid turns back off it's allowed to vent the air back out through three and it doesn't lock the solenoid and lock the air on so if you go through the opposite direction I still have positive air pressure in this circuit because it's going to be sending air through here coming out here going to the wastegate but then when I turn the solenoid off it turns into a normally closed circuit and it would just lock air pressure onto the wastegate and you don't want that you want it to be able to vent off so now I'll hook this up to the wastegate and then we'll look at it working so here would be wastegate hooked up with just a reference to the bottom of the wastegate no boost controller so you have your line coming in from your turbo or from your intake manifold the line comes into the bottom of the wastegate under the diaphragm and then when you get air pressure under the diaphragm it lifts up the valve and then wastes the exhaust gas so by controlling the release of the exhaust gas you control the turbo spool and you control your boost pressure so set up like this your final boost pressure would be determined by the spring that's in the wastegate and your amount of back pressure that you have pushing up on the valve so I'll turn the compressor valve on and we'll apply some air to the wastegate and watch the valve move [Music] all right so there we have air coming in you can hear it flowing it's actually leaking a little bit through the um through the diaphragm but even just doing that with my finger you can see how this valve moves because it's holding pressure onto the top when I plug that typically that shouldn't be leaking but that's a different story so we have so you have air coming in from the turbos or manifold pushing up on the diaphragm and pushing this valve open so depending how much boost pressure you have you may be assisted by exhaust pressure so my thumbs right now would be exhaust back pressure also moving the valve around so that's where you might see different final boost levels using the same wastegate with the same spring on different setups because of the amount of back pressure or how efficient the whole setup is your exhaust back pressure may be opening or closing the valve even more so now let's say we want to control the boost what we want to do is we want to start adding pressure onto the top of the wastegate to push this valve down and push this valve closed so we're not wasting as much gas so to do that we can add air to the top of the wastegate by taking another line and adding it to the top you can see my valve is open now I'm going to take my air reference and add it to the top so where does that put my final position of that valve so you can see how much more closed it is my back pressure is still able to push up on it a little bit but you can see the valve position there compared to the valve position here so typically if you have a line to the bottom of the gate and aligned to the top of the gate and they're both equal as we were just showing that setup would make about double what the spring pressure is so and by Spring pressure I mean whatever your reference is when you're just doing a line to the bottom of the gate so if you're running even if you have a eight pound spring if you run one line to the bottom of the gate and it makes 10 pounds and then you run a line equally to the top of the gate it'll make around 20 pounds so that jump from 10 pounds to 20 pounds might be too much so that's where you would add your Boost controller so you don't have to put all of the reference to the top you can modulate how much you put to the top and you're able to control it so let's do that we'll hook up the Boost controller which is just a valve and you can do this with a manual valve also enough similar to what I was doing before when I was putting the line to the top of the gate now I'll modulate it with the throttle so this is going to be adding duty cycle to this controller and it's going to be starting it at zero percent and then ramping it to 100 so as I give it a little throttle you can hear the solenoid working then as I give it more this would be like giving it more duty cycle starts to close that valve foreign all the way to the point where the solenoid is on and I'm applying equal pressure to top and bottom of the wastegate but I have the ability to control it so if I didn't want to go equal I can put half here I can give it a little I can give it a little bit less it can hold the valve right in the middle so it's not all the way open it's not all the way closed I can hold it right in the middle and kind of modulate where I want it and I can manage the boost pressure that way another thing to add is the valve is all the way open right now so I'll stroke the valve down to where it's closed in its closed position so that's all the way down but watch when I push on it with my thumb how easy it is to still open the valve now I can give it full equal pressure and now I'm not able to move that valve at all so my thumb would be representing back pressure so a less duty cycle my back pressure can easily manipulate this valve or open it up a little bit more if I give it more duty cycle it doesn't open the valve as far so that would Supply more air to the turbo more exhaust gas to the turbo give you more boost all right so I have this set up a little bit differently now still using a three port three port like four port because you're using a three port valve like a four port would work what that'll allow you to do is apply more reference to the top of the gate than the bottom of the gate so if we remember what we were talking about before this circuit from two to three is your normally open circuit so now instead of having an open line going to the bottom of the gate as a reference all the time it's going to go through the valve and this is your normally open circuit going to the bottom of the gate so you'll always have air pressure here when the solenoid is off as you start to actuate the valve it'll start sending air through number one to the top of the gate but in this configuration instead of maxing out at equal pressure one to one on top and bottom you start to close off the reference to the bottom of the gate and you apply more reference to the top of the gate which forces the valve to be closed more and gives you higher boost level than you would have had before so the other configuration you'd be able to double your wastegate pressure and this can figuration you can triple your waste great pressure so I do have a t added on here because this configuration doesn't have a vent so the four port valve actually has a built-in vent so again if you remember what we said this circuit does before this is normally closed when the solenoid is off so if you apply air pressure to the top of the gate here and then you shut the valve off you're going to be locking pressure in this line here on the top of the gate so you want that to be able to vent out if you don't have a t in it you could like poke a little hole in the airline also or you could drill a hole in the fitting here or whatever as long as this has a way to vent so now what I'll do is I'll turn the air back on we'll watch the valve open and then I'll actuate the throttle and we'll start to move this thing I'll start to actuate the valve you can see that it functions very similarly but now if we give it more duty cycle we'll be able to give more to the top than the bottom we actually start closing this off which closes off the reference to the bottom of the gate forces the valve closed so now what I should be able to do using throttle position as a reference is I should be able to apply air to the top of the gate watch when the valve is closed it's fully actuated and then see what the throttle position is hook it up the other way do the same thing and then this configuration should close the valve sooner than the other one meaning that a lower amount of duty cycle on the controller this way will give you a higher boost level sooner so let's do that all right so I have it hooked up traditional three-port way so what I'm going to do now is I'll give it reference to the bottom I'll actuate it until the valve closes and we'll see how much duty cycle it took to close it and then I'll hook it up three port like four port and we'll see how much duty cycle that takes to close [Applause] Now hook it up the other way now I have hooked up three port like four port compressor reference here goes through the normally open circuit to the bottom of the gate and then we're going to apply air to the top of the gate through this When I close now look at the log and see what it looks like okay so here's that data log you can see the two big spikes there this one's about half of what this one is so this is regular three port configuration it took 88.5 percent duty cycle on the controller to get the valve to close all the way so what that would be doing is nearly 100 duty cycle it's applying air almost equally to the top and the bottom of the diaphragm on the wastegate so you're almost maxed out there so now going over here that took about 38 duty cycle to get to the same point with the valve closed so at 38 duty cycle we'll call it half is the point where you reach having equal parts one to one on top and bottom of the gate so once you cross that point you start applying more pressure to the top of the gate forcing the valve down harder and making more boost and that's all I have to say about that

Channel: Blaser Builds

Views: 45,404

Keywords: a21 bravo, a21bravo, lq4, lm7, l33, lq9, budget ls swap, LS, LSX, Turbo LSX, Turbo lsx swap, lsx swap, Auto, repair, mechanic, education, engines, fast, how To, troubleshooting, electronics, electricity, DIY, Generator

Id: 7xfWmWf_w1s

Length: 14min 27sec (867 seconds)

Published: Thu Oct 20 2022