cant make gate spring psi
TECH Enthusiast
Joined: Feb 2020
Posts: 734
Likes: 209
So , you are getting 9 lbs in the manifold with hose from compressor to bottom of gate with 14 lbs of spring in the gate ? Is the 14 lbs confirmed with bench testing ? Could easily be only 12 . A few lbs lost from intercooler/piping restriction and back pressure helping open the gate is pretty normal and not a concern. The first picture of the gate shows good placement but no way of seeing the hose layout. The gate leaking from the lower housing would cause higher boost as stated but not a huge concern if gate functions well. Attempting to add boost with the controller and having no or reverse effect makes me question the controller or the way it is plumbed. A simple hand drawn diagram of your plumbing with help every one here see what's going on, should be lots of online hose routing diagrams to look at and I'm assuming a 3 port solenoid? Also saw your post about gear ratios, maybe try boosting in high gear if you aren't already - find a safe place !! Hope this helps
Thread Starter
On The Tree
Joined: Feb 2019
Posts: 157
Likes: 1
Solenoid is correct basic 3 port. Ill have to try just straight from compressor to gate without the boost control as well.
I'll try put more spring in. Could 9 possible be all it will make in first with the way the tunes now?
I remember having my manual boost tee and that not changing hardly with lots of turns.
I'll try put more spring in. Could 9 possible be all it will make in first with the way the tunes now?
I remember having my manual boost tee and that not changing hardly with lots of turns.
Thread Starter
On The Tree
Joined: Feb 2019
Posts: 157
Likes: 1
Solenoid is correct basic 3 port. Ill have to try just straight from compressor to gate without the boost control as well.
I'll try put more spring in. Could 9 possible be all it will make in first with the way the tunes now?
I remember having my manual boost tee and that not changing hardly with lots of turns.
I'll try put more spring in. Could 9 possible be all it will make in first with the way the tunes now?
I remember having my manual boost tee and that not changing hardly with lots of turns.
You'll just have to keep adding spring and easing into it to see what it makes. I think with the placement and valve size, once the gate cracks the exhaust flow is able to overcome the spring and just dump. What springs does it have?
TECH Enthusiast
Joined: Feb 2020
Posts: 734
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That 60 mm gate has nearly twice the surface area of a 44mm gate making it pretty easy for backpressure to blow it open , especially with good placement like you have . Don't think you mentioned which turbine you are running ? Which would effect the drive pressure. Still puzzling that your ebc is not having any effect
I am having the same issue as you are with my 50mm gate. I need a 20psi spring to make 15 psi. I think like 408 said it the surface area of the gate. My back pressure is low and it seems the gate cracks open early and it gets blown ope.
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TECH Addict
Joined: Dec 2004
Posts: 2,177
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From: Florida
Don’t forget guys, the pound rating of the gate spring is arbitrary and doesn’t equate to manifold pressure. It’s why ‘dome’ pressure is usually different than manifold pressure.
Make sure your map is correct and focus on that not on what eBay rates your spring at
Make sure your map is correct and focus on that not on what eBay rates your spring at
Teching In
Joined: May 2012
Posts: 45
Likes: 1
hey hey, I have precision gates and springs and have 15-16lb springs giving me 10psi. 😂 But im not complaining cause the controller makes up for it.
Thread Starter
On The Tree
Joined: Feb 2019
Posts: 157
Likes: 1
I've got 19# spring now and with the compressor Hooke up-to top port making 16psi pretty well, might go more I let off.
So you guys didn't find any back pressure issues though. I was thinking to weld in a fitting and maybe get. Some measurements
So you guys didn't find any back pressure issues though. I was thinking to weld in a fitting and maybe get. Some measurements
TECH Enthusiast
Joined: Feb 2020
Posts: 734
Likes: 209
I don't think you have a backpressure issue , just backpressure like the rest of us. Probably about 1.5 - 2 times boost pressure I would ball park it. Not a problem , good info for further tuning but not necessary IMO for a street car. Put in whatever spring pressure gives you the boost your looking for !! Should be able to double that pressure with a 3 port ebc. Line from comp housing to bottom of gate , that line teed off to the solenoid , solenoid to top of gate . Ebc off or at 0% should give gate spring pressure ( not actual spring pressure, but what your setup gets with that spring) in your case that's going to be quite a bit lower cause of the big gate , great placement and backpressure. Nothing wrong , just gotta adjust until you get what you're looking for. You've got another thread going on this subject with some tuning numbers , briefly the power does seem low and the timing a bit conservative for pump gas ( not terrible) If you want to run a long time . But way low for E 85 (not available for me , but have read enough on here to see what others are doing) for pump alot use the 14lbs 14° setup , I would and have tried 14lbs and 12° read plugs and go from there. Hope this helps
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Joined: Feb 2020
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Judging by the earlier picture ,you've got the crossover pipe running under the engine- is there a flex piece in there ? Did you use the type with no woven mesh on the inside?if not , those are known to come apart and cause blockages and/or send pieces through your turbine. You might want to check pressure before the flex and near the turbo to rule that out