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Re: [FlyRotary] boost controllers
Rusty,
All boost controllers I have come across
work by modifying the pressure the waste gate controller is seeing to ‘trick’
it into either staying closed, or staying open. All waste gates
will open if not kept closed by something. The spring that is used is fairly
stout. It has to work against both the intake manifold pressure and the
exhaust manifold pressure which are both working to open the waste gate. But
don’t just install a random spring – either it will be too weak to
do any good, or it won’t open the waste gate when it needs to and you’ll
blow an engine. (in other words, there is no perfect sized spring unless it is
acted against by the boost pressure.)
The stock waste gate controller is about
as light as it gets and you shouldn’t run into any problems with the ~5-7
psi it usually dishes out. But if you wanted to decrease the boost you
could lengthen the actuating arm a little or change out the spring.
Install the stock waste gate controller, Rusty.
It does little good to have a turbo that doesn’t produce any boost and
you can easily control your manifold pressure with the throttle (every turbo
car runs just fine idle). Also, keeping that waste gate closed at low
power settings will help quiet the exhaust.
Greetings,
Has anyone ever seen an aftermarket boost controller that
uses a motor of some sort to directly drive the wastegate?
I've found a couple of controllers that will work as
absolute pressure devices (HKS EVC IV atm, and EVC PRO), but they use a stepper
motor as a variable air leak for the normal wastegate actuator. Even
this would be a step forward, but I'd need an actuator with a light
spring. Of course I can't tell how low these controllers will regulate,
since they only brag about the high end. Anyway, something else to think
about.
Speaking of light springs in the actuator, how light could
you go and still have it work? In other words, if there was nothing
hooked up to the wastegate lever, would it have a tendency to open, or
close? I'm guessing that it would try to open, so you need some spring
pressure to hold it closed, but how much, I haven't a clue. As usual,
more questions than answers...
I'm starting to imagine a big RC servo being controlled by
some sort of electronics connected to a MAP sensor. Hey Tracy, how about
throw that into my EM-2 :-)
Rusty
The end is near... uhh, make that in sight :-)
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