Wastegate woes( Cortex EBC installed)
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On The Tree
Joined: Dec 2013
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From: North Vanacouver , BC
Wastegate woes( Cortex EBC installed) I have a JGS 60mm wastegate on my setup 5.3 LS9 Cam , S475 T4 83mm exhaust 1.10 A/R( high back pressure setup) . Its probably oversized for my application hence why I have a hard time keeping it shut better than boost creep I guess. I bought it about 8 years ago when I barely knew anything about turbos and the guys at forced inductions recommended I buy one . With the lightest spring I get 2 psi with line hooked to bottom of the port and 3-4 psi with nothing hooked to the WG. With the two springs together and a small spacer to make them even tighter and line hooked up to the bottom port it'll do about 9 Psi tapering of to 7 at the top of the rev range . With nothing hooked to the WG it'll do 19 psi gradually dropping to about 15 at the top .
I just ordered a cortex boost controller (best bang for the buck given the features ) haven't recieved it yet . I was wondering if it would be ok to just run a line to the top of the dome to add some pressure and keep the gate shut especially at higher rpms to get a flatter boost curve . Since any other way I hook it up it's only going to limit the amount of peak boost I run . The other way would be to run a line with full pressure to the top and have the boost control solenoid hooked up to the line going to the bottom port and just bleed of some pressure there. Any suggestions?
I just ordered a cortex boost controller (best bang for the buck given the features ) haven't recieved it yet . I was wondering if it would be ok to just run a line to the top of the dome to add some pressure and keep the gate shut especially at higher rpms to get a flatter boost curve . Since any other way I hook it up it's only going to limit the amount of peak boost I run . The other way would be to run a line with full pressure to the top and have the boost control solenoid hooked up to the line going to the bottom port and just bleed of some pressure there. Any suggestions?
Last edited by Lsx Rubi; Dec 5, 2020 at 11:48 PM.
I have a JGS 60mm wastegate on my setup 5.3 LS9 Cam , S475 T4 83mm exhaust 1.10 A/R( high back pressure setup) . Its probably oversized for my application hence why I have a hard time keeping it shut better than boost creep I guess. I bought it about 8 years ago when I barely knew anything about turbos and the guys at forced inductions recommended I buy one . With the lightest spring I get 2 psi with line hooked to bottom of the port and 3-4 psi with nothing hooked to the WG. With the two springs together and a small spacer to make them even tighter and line hooked up to the bottom port it'll do about 9 Psi tapering of to 7 at the top of the rev range . With nothing hooked to the WG it'll do 19 psi gradually dropping to about 15 at the top .
I just ordered a cortex boost controller (best bang for the buck given the features ) haven't recieved it yet . I was wondering if it would be ok to just run a line to the top of the dome to add some pressure and keep the gate shut especially at higher rpms to get a flatter boost curve . Since any other way I hook it up it's only going to limit the amount of peak boost I run . The other way would be to run a line with full pressure to the top and have the boost control solenoid hooked up to the line going to the bottom port and just bleed of some pressure there. Any suggestions?
I just ordered a cortex boost controller (best bang for the buck given the features ) haven't recieved it yet . I was wondering if it would be ok to just run a line to the top of the dome to add some pressure and keep the gate shut especially at higher rpms to get a flatter boost curve . Since any other way I hook it up it's only going to limit the amount of peak boost I run . The other way would be to run a line with full pressure to the top and have the boost control solenoid hooked up to the line going to the bottom port and just bleed of some pressure there. Any suggestions?
you can take a 5psi spring and make 20 psi with it. 5psi with the vac reference to the bottom. 10psi with no boost reference. 10psi with boost reference to both ports... and 20psi with boost reference to just the top port
you can plumb a 3 port Mac valve to supply boost reference to the bottom port and when you send a pwm single to it, it will begin diverting the reference to the top pot. Giving you control from spring pressure to 4x spring pressure. Roughly. There are a lot of variables and it takes some testing to dial boost control in
Last edited by Dragframe; Nov 2, 2020 at 10:09 PM.
I suggest drilling a tiny little bleed hole in the line going from the top of the gate to the Mac valve. You may not need to do this, but the jgs gates are high quality and I expect little leakage with their design. The bleed hole will give the boost in the line somewhere to vent when the Mac diverts to the bottom port.
Mac valve is just a flow diverter valve that you can pulse to get a desired amount of flow between the ports.
Last edited by Dragframe; Nov 2, 2020 at 10:12 PM.
Thread Starter
On The Tree
Joined: Dec 2013
Posts: 182
Likes: 11
From: North Vanacouver , BC
I suggest drilling a tiny little bleed hole in the line going from the top of the gate to the Mac valve. You may not need to do this, but the jgs gates are high quality and I expect little leakage with their design. The bleed hole will give the boost in the line somewhere to vent when the Mac diverts to the bottom port.
Mac valve is just a flow diverter valve that you can pulse to get a desired amount of flow between the ports.
Thread Starter
On The Tree
Joined: Dec 2013
Posts: 182
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From: North Vanacouver , BC
On the three port valve since we are using the vent side as well, what will happen is the once the valve is at 0 duty cycle and valve is denergized the pressure in the dome will be trapped , that's where the tiny vent will help .
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New car has a Cortex EBC and I don't think this has been done, so this will help the EBC control the WG more effectively?
Please forgive the million questions, just trying to understand the how and why.
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I have a cortex. I have their 3 port solenoid, 44mm Tial gate.
I can control down to 6 psi and up to 20 psi. I have a line to the top and bottom of the dome, NO bleed hole. its worlds better with the cortex than with a manual valve.
I can control down to 6 psi and up to 20 psi. I have a line to the top and bottom of the dome, NO bleed hole. its worlds better with the cortex than with a manual valve.
Thread Starter
On The Tree
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From: North Vanacouver , BC
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From: Norn Iron
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From: Norn Iron
The method above is less common and what I've been doing for the last decade. The bleed hole was my idea, and is not in any instructions for that plumbing method, but it makes operation much much easier.
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From: Norn Iron
I was unaware of this mod, I installed an Innovate SCG-1 EBC in my old car and never drilled a hole and it seemed to work fine?
New car has a Cortex EBC and I don't think this has been done, so this will help the EBC control the WG more effectively?
Please forgive the million questions, just trying to understand the how and why.
New car has a Cortex EBC and I don't think this has been done, so this will help the EBC control the WG more effectively?
Please forgive the million questions, just trying to understand the how and why.
There are at least 2 plumbing options where you use both top and bottom chambers....both are not the same though.
The method above is less common and what I've been doing for the last decade. The bleed hole was my idea, and is not in any instructions for that plumbing method, but it makes operation much much easier.
The method above is less common and what I've been doing for the last decade. The bleed hole was my idea, and is not in any instructions for that plumbing method, but it makes operation much much easier.
between the Wategate diaphragm and cheap Mac valves, I think some people get away without the bleed because there is enough leakage in the system to provide the bleed.
But bet if those people added the bleed, they would get improved the control and flatter/consistent boost curves
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From: Norn Iron
between the Wategate diaphragm and cheap Mac valves, I think some people get away without the bleed because there is enough leakage in the system to provide the bleed.
But bet if those people added the bleed, they would get improved the control and flatter/consistent boost curves
But bet if those people added the bleed, they would get improved the control and flatter/consistent boost curves
Thread Starter
On The Tree
Joined: Dec 2013
Posts: 182
Likes: 11
From: North Vanacouver , BC
Well , thank you gentlemen , knew someone would have a solution here . Don't know when my boost controller is going to show up though , they are having trouble sourcing the pressure sensor , so I maybe waiting a while.
I've yet to see a top port "seal" on a waste gate. I can't see that bleed hole being necessary unless it does. That is how I've run my $16 3 port china MAC valves on my cars since the start and has always worked very well.
Thread Starter
On The Tree
Joined: Dec 2013
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From: North Vanacouver , BC
I finally recieved my boost controller couple of days ago . Hooked it up last night and was playing with it today . Still having issues controlling boost . Have the solenoid hooked up as mentioned in one of the above post . 0% DC makes 5-7 psi , going from 10% to 88%DC I only see it going from 9 psi to 13 psi respectively. Which only leaves me with a very narrow window of resolution to play with .Is that usually the case ? Should I try putting in stiffer springs and see if that works better . If I command 100% DC it will make over 26 psi ( which is where I have the boost cut set ).
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From: Norn Iron
As always, draw a schematic of EXACTLY how YOU have it plumbed/configured.
Often people make mistakes, and they think they're doing something they are not. It is essential for any attempt at a remote diagnosis.
Often people make mistakes, and they think they're doing something they are not. It is essential for any attempt at a remote diagnosis.