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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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we're all sick and tired of ur quest to make mo powa, wire the damn wg shut and eyeball the boost gauge...12, 18, 25, just control boost with ur right foot and stfu
ps--lmao at the sig |
Originally Posted by tvalenziano
(Post 366748)
we're all sick and tired of ur quest to make mo powa, wire the damn wg shut and eyeball the boost gauge...12, 18, 25, just control boost with ur right foot and stfu
ps--lmao at the sig |
Originally Posted by tvalenziano
(Post 366748)
we're all sick and tired of ur quest to make mo powa, wire the damn wg shut and eyeball the boost gauge...12, 18, 25, just control boost with ur right foot and stfu
ps--lmao at the sig Your just mad cause your still at "5-6 psi" __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
Originally Posted by tvalenziano
(Post 366748)
wire the damn wg shut...
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Originally Posted by m2cupcar
(Post 366861)
:werd: 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?
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? __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
pop off the actuator and then wire the wastegate closed....can you make more?
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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 |
Originally Posted by Braineack
(Post 366870)
pop off the actuator and then wire the wastegate closed....can you make more?
Originally Posted by m2cupcar
(Post 366873)
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 Thanks M2. :bigtu: 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? __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
The hardware has a cabinet/drawer that's filled with springs. I just a picked a couple that looked applicable.
Make sure you test your wastegate/boost spool on road w/o distractions, because you want to be watching you're gauge when this is going down. :eek5: |
just dont blow the welds off your intake mani mmmmk?
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Originally Posted by m2cupcar
(Post 366903)
The hardware has a cabinet/drawer that's filled with springs. I just a picked a couple that looked applicable.
Make sure you test your wastegate/boost spool on road w/o distractions, because you want to be watching you're gauge when this is going down. :eek5: Yeah deffinately, dont need to be hitting 20+ psi or anything. lol __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
that's what overboost feature is for!
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Originally Posted by Braineack
(Post 366926)
that's what overboost feature is for!
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Originally Posted by Braineack
(Post 366926)
that's what overboost feature is for!
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Word. Overboost protection FTW, or to avoid FTL.
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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. |
Overboost saved my ass at least once. Turns out if you turn the car on, and THEN plug the GM solenoid in, it locks at 100% DC. :bang:
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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? __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
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.
http://i158.photobucket.com/albums/t...rspring640.jpg 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. |
How much does the waste gate open when it does? Half way, all the way?
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The spring does not keep the valve from opening to it's max open position. The idea is to get your spring tension so that it helps keep the valve shut as boost is rising, but ultimately is overcome by the force of the actuator. Not exact, but think of the actuator as having a linear progression as it opens whereas the spring will change that line to a curve (like a skateboard quarter pipe). Make sense? Your logs are going to show you what's going on with the spring. You'll see improvements with spool as you increase tension, and eventually start to see hints of exceeding your target as the spring tension is too great and keeps the gate from fully opening.
Did you compare your spool (not just peak boost) with the gate wire shut compared to the gate in normal operation? |
Originally Posted by m2cupcar
(Post 367471)
The spring does not keep the valve from opening to it's max open position. The idea is to get your spring tension so that it helps keep the valve shut as boost is rising, but ultimately is overcome by the force of the actuator. Not exact, but think of the actuator as having a linear progression as it opens whereas the spring will change that line to a curve (like a skateboard quarter pipe). Make sense? Your logs are going to show you what's going on with the spring. You'll see improvements with spool as you increase tension, and eventually start to see hints of exceeding your target as the spring tension is too great and keeps the gate from fully opening.
Did you compare your spool (not just peak boost) with the gate wire shut compared to the gate in normal operation? Not yet, I did datalog though. I'll have to take a look at it later. Although I havent figured out how so show boost in mega log viewer. __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
When in Megalogviewer look at the column on the left. These have things like CLT, TPS, RPM, etc. Left click directly on something you don't care about like CLT or one that's blank. A list will drop down of options for that line. Click on what stats you want to have shown. There's a lot there. This will revolutionize your view of MLV!
Jeez. The youth of today. Gotta do everything for em. |
Originally Posted by cueball1
(Post 367508)
When in Megalogviewer look at the column on the left. These have things like CLT, TPS, RPM, etc. Left click directly on something you don't care about like CLT or one that's blank. A list will drop down of options for that line. Click on what stats you want to have shown. There's a lot there. This will revolutionize your view of MLV!
Jeez. The youth of today. Gotta do everything for em. I know about the different options but I donot see boost listed. __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
you have to turn boost on by going into optional fields and telling MLV what the typical ambient kPa is first....
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MAP doesn't show?
Might be a dumb response since I'm just a user. I don't build the things. A little bit of knowledge can be a dangerous thing in my hands. |
Originally Posted by Braineack
(Post 367522)
you have to turn boost on by going into optional fields and telling MLV what the typical ambient kPa is first....
Im there, its asking me "Engine off MAP pressure in KPA" ? __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
Originally Posted by levnubhin
(Post 367530)
Im there, its asking me "Engine off MAP pressure in KPA" ?
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Originally Posted by levnubhin
(Post 367530)
Im there, its asking me "Engine off MAP pressure in KPA" ?
Mine says 64 KPA. I found this thread when I Googled ambient kpa and it should be right if I have a 2.5 bar map. Scott, is that what you gave me? https://www.miataturbo.net/forum/t23963/ __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
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