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Sounds good. I'm planning on a pair or maybe even 3 MS3 units with a relay board going between them. Basically, said board would distribute any and all sensor signals so that all MS3s would see all the signals, but the injectors and coils would be run by only one MS3. I don't yet know exactly what I'm going to do here, but the MS3 (with the expansion board) can run 8 injectors. I'm thinking 2 or 3 per rotor, so that if any one injector goes down, it keeps running OK. The MS3 does the whole injector staging thing well, so that might work.

It also has 8 sparkplug outputs (with the expansion board), so it can drive each independently.

On Thu, Feb 17, 2011 at 10:40 AM, Ernest Christley <echristley@nc.rr.com> wrote:

Dustin Lobner wrote:

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.

Dustin, I'm using the Megasquirt-3. God willing, and the creek don't rise, it should be making some noise this weekend. All I've got left is to install the throttle cable, run a water line, and attach the battery. (and then carefully step through each system to make sure everything is connect, of course).

I went with the Ford EDIS ignition. The MS will control the advance, but the ignition will continue to operate with 10 degrees of advance if the MS dies. I positioned the VR sensor so that the advance will actually be 25 without any input. Initially, I'm only using one 4-place EDIS, with the waste spark going to the trailing plug. A future enhancement is to install the second EDIS module, and ground the waste spark, forcing all the power to drop across a single plug. I have two VR sensors installed, both using the same pickup wheel.

I'm using stock injectors, with a returnless fuel system. In case of fuel-pump/Megasquirt/injector failure, I ran a second fuel line to the throttle body that is controlled by a needle valve. If the injectors quit for any reason, the plan is to crack open the valve and let the fuel just dump into the intake. It will most likely run rough, and it would never start that way, but it should keep me in the air.

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