Too light of a spring will blow open too fast for boost to react. Not saying that's it but I agree with mink delete the gate before you do anything else
Surging
- Thread starter madman1234509
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Too light of a spring will blow open too fast for boost to react. Not saying that's it but I agree with mink delete the gate before you do anything else
madman1234509
New member
With that setup wouldn't you be turning the regulator clockwise to let more boost in the top port, thus keeping pressure on the valve and not opening as soon. Did you get that diagram off a gasser site?
Powerstroked162
On Da Juice
Thats how its done. Pressure on the diaphragm to keep the gate closed. Less pressure reverts back to spring pressure in the gate.
Now that I think about it, my gates are only plumbed with regulated boost reference to the top port.... regardless, for the time being, ditch the gate and run it. Remove it from the up pipes and see what you come up with. If the problem goes away, obviously you know thats your issue and if you want to add the gate back then you'll need to re-route your reference lines
Now that I think about it, my gates are only plumbed with regulated boost reference to the top port.... regardless, for the time being, ditch the gate and run it. Remove it from the up pipes and see what you come up with. If the problem goes away, obviously you know thats your issue and if you want to add the gate back then you'll need to re-route your reference lines
gates really should be ran in that manner all the time, it allows for far better control of the wastegate.
When reading spring pressures on gates, if you have 22psi of spring that means thats the min boost pressure you will achieve with full boost to the bottom of the gate, no pressure to the top of the gate, and back pressure acting on the valve in the gate. Keep in mind that it only works with a perfect 1:1 ratio of boost to back pressure but it will get you in the ball park.
I think your gate is giving you hell one way or the other.
Are you getting the backpressure reference from the same place your back pressure sensor is hooked up?
When reading spring pressures on gates, if you have 22psi of spring that means thats the min boost pressure you will achieve with full boost to the bottom of the gate, no pressure to the top of the gate, and back pressure acting on the valve in the gate. Keep in mind that it only works with a perfect 1:1 ratio of boost to back pressure but it will get you in the ball park.
I think your gate is giving you hell one way or the other.
Are you getting the backpressure reference from the same place your back pressure sensor is hooked up?
madman1234509
New member
It's from the same up pipe
But a different location?
Generally I like to have the gate and ebp sensor on seperate uppipes
madman1234509
New member
Yea same pipe different location
madman1234509
New member
So just got a call. The waste gate is off. The truck isnt surging anymore and is hitting full boost. 50.6psi and full back pressure. Truck still had a weird shudder just cruising at 55mph or so. Im going to have to drive the truck, the guy was saying that with the torque converter locked if you roll onto the throttle it gets going then does something weird and falls on its face. Im going to drive it tomorrow and let you guys know. Going to leave the gate off of it for now until I see what hes talking about. That could be causing the gate to "flutter". I really doubt it was the plumbing. My buddy has the same exact gate and plumbing of the gate and it works perfect.
Craig@MFI
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make sure the valve seat isnt missing off the wastegate
Good to hear - as Ive said before, mine is doing the same shudder at 55 in the race tune. I swapped converters and nothing changed. When you get yours back I wouldnt mind hearing if your shudder goes away in the smaller tunes as mine does.
madman1234509
New member
Maybe that shudder is the tuning then. I never noticed it when i ran the 250 tune the other day. Some guys keep saying trac bars fix it. As for the falling on its face while slowly rolling on it with the torque converter is locked, ill get back to you guys. I'll get some logs and stuff. I'll see how its driving, and if its good ill either put the gate back on, plumb it differently, or just swap it with another one
idkillinit
New member
You sure your buddies has a 20lb spring. I think mine is a 22
madman1234509
New member
Took the truck out a bit today before work. Runs amazing now. Pulls hard as hell. Def going to be getting an RCD torque converter soon. Hopefully ill be able to get on a dyno to get you guys some numbers on stock fuel with the cam and do a write up. Debating on putting the gate back on and plumbing it differently to see if it changes what was going on or just leaving it till I get bigger turbos
Powerstroked162
On Da Juice
Good to hear. If you feel comfortable enough to do it, maybe think about taking the gate apart and look at the diaphragm to see if its blown or not before you go through the effort of reinstallation. I honestly think it was just the way your reference was ran that was giving your issues
madman1234509
New member
It doesn't have a diaphram. The way its plumbed works. Tons of diesel guys run em like that on comp d. The guy who built my truck has a twin cummins and my buddy with his 6.4 are both plumbed that way with the same gates it they work awesome
A wastegate with no.diaphram? Please ellaborate
BFT
Moderator
BFT
Moderator
The gate with no diaphragm is actually pretty cool. Check it out, it makes for an interesting read and possibly something to look into for our set ups
http://www.turbomagazine.com/tech/0705_turp_synchronic_wastegate/viewall.html
http://www.turbomagazine.com/tech/0705_turp_synchronic_wastegate/viewall.html
madman1234509
New member
I dont believe jgs gates have diaphrams. I think in the begining thats why I went this route is so I wouldnt have diaphram issues in the future.
I don't know anything about them so good to know. Also.could be the reason your having issues
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