Need more boost
02-10-2009, 10:55 PM
#1
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Need more boost
I couldn't get over 12.5 psi with my Hallman so I tried a friends Turbo XS mbc and couldn't get over 10. So know Im thinking there is something wrong with my actuator. Or could it be the bracket I made for it when I clocked my turbo? It is kind of flimsy.
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damn who the **** pissed in your coffee today
02-10-2009, 11:04 PM
#4
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Your just mad cause your still at "5-6 psi"
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That will tell you if you have a leaking wg - which I suspect. Just watch the gauge and stop when it nears your desired target boost. If does get there, then add a helper spring or dual port actuator. We are talking internal wastegate right?
02-11-2009, 09:00 AM
#6
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Yes internal on a 2554. Tell me more about this helper spring. Is it possible that my flimsy bracket for the actuator can be the problem?
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02-11-2009, 09:10 AM
#8
Yes. Check your linkage with the car sitting still and make sure it's not loose. That flapper needs to seal the port shut.
The helper spring and the dual port actuator do the same thing. The provide resistance against the boost pressure pressing on the flapper valve. So the actuator has to overcome this resistance- keeps the valve sealed longer and produces a quicker valve opening. Most actuators open over a 3-4 psi span - which means you start leaking boost far before the actuators rated open state. Internal gates are definitely the weaker solution, but they can be improved upon. You just need to make sure that's the problem.
helper spring thread
another post describing my spring
The helper spring and the dual port actuator do the same thing. The provide resistance against the boost pressure pressing on the flapper valve. So the actuator has to overcome this resistance- keeps the valve sealed longer and produces a quicker valve opening. Most actuators open over a 3-4 psi span - which means you start leaking boost far before the actuators rated open state. Internal gates are definitely the weaker solution, but they can be improved upon. You just need to make sure that's the problem.
helper spring thread
another post describing my spring
Last edited by m2cupcar; 02-11-2009 at 09:20 AM.
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02-11-2009, 10:06 AM
#9
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Yes. Check your linkage with the car sitting still and make sure it's not loose. That flapper needs to seal the port shut.
The helper spring and the dual port actuator do the same thing. The provide resistance against the boost pressure pressing on the flapper valve. So the actuator has to overcome this resistance- keeps the valve sealed longer and produces a quicker valve opening. Most actuators open over a 3-4 psi span - which means you start leaking boost far before the actuators rated open state. Internal gates are definitely the weaker solution, but they can be improved upon. You just need to make sure that's the problem.
helper spring thread
another post describing my spring
The helper spring and the dual port actuator do the same thing. The provide resistance against the boost pressure pressing on the flapper valve. So the actuator has to overcome this resistance- keeps the valve sealed longer and produces a quicker valve opening. Most actuators open over a 3-4 psi span - which means you start leaking boost far before the actuators rated open state. Internal gates are definitely the weaker solution, but they can be improved upon. You just need to make sure that's the problem.
helper spring thread
another post describing my spring
Thanks M2.
I have to stop at Homedepot on the way home so I'll look for something. That spring you used, what is it made for?__________________
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02-11-2009, 10:18 AM
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Yeah deffinately, dont need to be hitting 20+ psi or anything. lol
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02-11-2009, 11:05 AM
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02-11-2009, 01:43 PM
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I already had an incident where overboost protection probably saved my motor when the manual boost controller **** fell out and I saw 20psi. Driving without overboost protection is like glory-holing in the Castro. Sooner or later a simple mechanical failure or malfunction will poz your sweet, unsuspecting neg-hole.
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02-11-2009, 02:19 PM
#17
Overboost saved my motor when I had my WG hooked up wrong so that it would never open. 
I was like, "Damn, it's an 8 PSI gate and I'm making 12 PSI and hitting overboost? Let's try 200kPa overboost and see what happens. Damn, still not right! Wow 15 is sweet! And maybe my WG's hooked up wrong..."
See the other thread on internal wastegate woes. Get the dual port thingy if you can. It's better.
I was like, "Damn, it's an 8 PSI gate and I'm making 12 PSI and hitting overboost? Let's try 200kPa overboost and see what happens. Damn, still not right! Wow 15 is sweet! And maybe my WG's hooked up wrong..."See the other thread on internal wastegate woes. Get the dual port thingy if you can. It's better.
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02-12-2009, 08:57 AM
#19
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Ok, So I wired the wastegate shut and I can deffinately hit over 15 psi. So I guess I have to work on a helper spring.
Here is an assortment of springs, M2, do any of these look like what you used?
Now someone talk to me about this over boost protection. I set it at 16 psi and it could have gone right past that so then I set it at 10 and it did go right past that. Is there anything else I need to setup?
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Here is an assortment of springs, M2, do any of these look like what you used?
Now someone talk to me about this over boost protection. I set it at 16 psi and it could have gone right past that so then I set it at 10 and it did go right past that. Is there anything else I need to setup?
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Last edited by levnubhin; 10-07-2009 at 03:02 PM.
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02-12-2009, 09:25 AM
#20
It's hard to say w/o any scale reference. Guessing, mine looks like something in between your small and large springs. Maybe the same wire ga. as the one second from the right with only a few coils. Here's a photo of mine installed with a sharpie marker stuck in the actuator bracket for size/scale reference.
It's set up so it only takes very little effort to get it over the wastegate arm. I used some sheet metal as a connector for the spring to keep it from interfering with the actuator connection.
It's set up so it only takes very little effort to get it over the wastegate arm. I used some sheet metal as a connector for the spring to keep it from interfering with the actuator connection.
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