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Hi everyone,
I posted this today on the HomeBuiltAirplanes forum. Going to C/P it here for comments/questions/flaming.
Background, I'm planning on building up a Renesis with a Turbonetics turbo, putting it into a Mustang II. I'm planning on using MegaSquirt 3 (or whatever is available when I get there) ECUs. These ECUs control things like waste gate management, any servos you want, in addition to the the EFI and ignition.
So... <copy-paste from the forum>
The Renesis has 6 intake ports (I think a 4 port model was made for
awhile, but I'm going to buy a crate engine so that's out). I found a
white paper somewhere, written by the designers of the Renesis, talking
about each port. There's the primary, which is always open. Secondary
comes on 3,500-4K RPMs-ish. Aux turns on at 7.5K RPMs. The ECU I'll be
using has outputs for controlling things like butterfly valves for
different intake runners.
My understanding is that most people simply run on the pri/secondary
only and plug the aux, or run with them all going. Seeing as how I'll
have an ECU to do some work if I want, what do people think about
valving either the aux or the secondary and aux? The ECU is flexible
regarding mixtures and whatnot, so I'm thinking I could tune the
"cruise" setting for 6K RPMs, aux closed, and then tune the "max power"
setting for 7k RPMs with the butterfly opening at 6800 or something.
Wastegate (should I go with a turbo) can vary by RPM too, so I could
have it set for "normalize" 6800 and below, and "boost the heck out of
it" above that.
*Shrugs* I know, it's an airplane, KISS. I have a few years before I'll
be to the point of being able to wrench on the engine, so I'm dreaming
about it now and hashing things out now so that when the engine gets
here I can just build. From discussions on the Mazda list, different
length runners DO matter quite a bit, so it's not like this is a
completely worthless thought.
Thinking about it, valving the secondary seems a bit stupid, because if
that valve breaks you don't have a good portion of your power, whereas
if you lose the aux it's not the end of the world.
<end paste>
I guess what I'm going for is, I remember some conversation here about different length runners for different tuning. This could let you have the best of both worlds...thoughts? And mind you, I have a two engineer aviation minded friends, one with a ME/EE double and one with an AeroE, so I'm not completely without help designing this.
Dustin
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