What wastegate spring rate for electronic boost controller?
#1
What wastegate spring rate for electronic boost controller?
I need some advice on what spring to buy for my Tial 35mm external wastegate, and I couldn't find a thread covering it.
I'm setting up to run electronic boost control from the Megasquirt using a solenoid.
I want to work my way up to 10psi gradually, since megasquirt will take some figuring out, and I want the ability to run low boost in the winter.
The way I look at it, the weaker the spring the quicker the wastegate will open but the slower it will close, although it should close much faster than it opens since it has both the spring and boost pressure acting on it.
My question is this: What spring should I use if my ultimate goal is 10psi, and I want the ability to gradually turn up boost AND I want best wastegate performance. Would a 4psi spring be too low? If so I could buy a "winter" spring at say 4psi.
Thanks for helping!
I'm setting up to run electronic boost control from the Megasquirt using a solenoid.
I want to work my way up to 10psi gradually, since megasquirt will take some figuring out, and I want the ability to run low boost in the winter.
The way I look at it, the weaker the spring the quicker the wastegate will open but the slower it will close, although it should close much faster than it opens since it has both the spring and boost pressure acting on it.
My question is this: What spring should I use if my ultimate goal is 10psi, and I want the ability to gradually turn up boost AND I want best wastegate performance. Would a 4psi spring be too low? If so I could buy a "winter" spring at say 4psi.
Thanks for helping!
#8
This has been hashed out more times than I can remember, but the stock internals are not limited by boost, per se. They are limited by cylinder pressure and knock. Boost contributes to cylinder pressure...as does the onset of boost and at what RPM it comes on.
Furthermore, 10psi from a TD04-15G is different than, say, 10psi of boost from an SC61 turbocharger. Further-furthemore, the '99+ cars have higher static compression and generally cannot run as much boost as the '90-'97 cars (although their heads flow much better).
Furthermore, 10psi from a TD04-15G is different than, say, 10psi of boost from an SC61 turbocharger. Further-furthemore, the '99+ cars have higher static compression and generally cannot run as much boost as the '90-'97 cars (although their heads flow much better).
#9
This has been hashed out more times than I can remember, but the stock internals are not limited by boost, per se. They are limited by cylinder pressure and knock. Boost contributes to cylinder pressure...as does the onset of boost and at what RPM it comes on.
Furthermore, 10psi from a TD04-15G is different than, say, 10psi of boost from an SC61 turbocharger. Further-furthemore, the '99+ cars have higher static compression and generally cannot run as much boost as the '90-'97 cars (although their heads flow much better).
Furthermore, 10psi from a TD04-15G is different than, say, 10psi of boost from an SC61 turbocharger. Further-furthemore, the '99+ cars have higher static compression and generally cannot run as much boost as the '90-'97 cars (although their heads flow much better).
So, what happens if you use too light a spring w/ an EBC?
#11
you can run a low pressure spring with an ebc..... because you can usually adjust the solenoid duty cycle in order to adjust wastegate crack pressure....
the problem I am having with my MBC and a .4bar spring, is that the wastergate opens too early, and slows boost response..... you can remedy that with a properly set up EBC
now if I can just get my AVC-R installed and tuned correctly.....
the problem I am having with my MBC and a .4bar spring, is that the wastergate opens too early, and slows boost response..... you can remedy that with a properly set up EBC
now if I can just get my AVC-R installed and tuned correctly.....
#13
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well it's more complicated than that. boost pressure is directed to one side of the diaphragm in the actuator and (pounds per square inch)/(square inches) = (pounds of force), but those are different square inches than the wastegate port on your turbo generally speaking. the WG port is smaller and the pressure is lower post-turbo than boost.
but at some point (why I say "high boost") it'll still open up. you wanna find out, get your 4 psi spring and dont run a vac line to the actuator
but at some point (why I say "high boost") it'll still open up. you wanna find out, get your 4 psi spring and dont run a vac line to the actuator
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