QUESTION   Could I get some further explanation on why to only have the key operate the starter. A switch is a switch, what is the difference between a car were the key operates ignition and is momentary to the starter? There would still be a master and the engine monitor would still be separate.

ANSWER: I don't like to see the key switch between the ECU and the battery.   After marked ignition switches are not very reliable, and even if they were, I don't like them, or their flimsy terminals on the back.  It would have to power a relay that would trigger the ignition.  Too many parts.  I want the ECM and a fuel pump to have as few connections to reach the battery as possible.  The ECM / fuel pump switches should be the best quality you can find.
 
 ECU INSTALLATION HINTS
Put it in a place where you can drop it down in 10 seconds by laying on your back under the panel.  There WILL be software updates and the chip is INSIDE the ECU.  Make something with a strap and 2 wing nuts / lock washers, having the ECU lid facing down and enough slack in the wire loom that it will drop down with the ECU and you will be able to remove the screws from the connectors.  The easier you can get to it, the better your life will be in 3 years :)
 
Jan

Tray for ECM for the Subaru H6 in my RV-6A

Here's how I mounted the ECM in my RV-6A

 

 
The tray started out as a sheet of .032 aluminum.  

The front and sides were bent to strengthen it.
 
Dry fitting the tray for position. I put it rearward enough that when it flips down, it will clear the rudder pedals and be just about vertical.

   Marking where the ECM will go.
 
Positioning the forward hinge support. It is made from 3/4x3/4 .063 aluminum angle.
  

Fitting hinges to the tray and forward hinge support. I've also cut lightening/cooling holes in the tray. The upper right corner was angled to clear an engine mount.
 
Final fitting of tray. Tray in the lowered position.   Tray in the raised position. From here, I'll clamp it in final postion and drill 2 holes for rivets to secure the forward hinge support and 2 holes rearward for screws to hold the tray up.
 
Underside view of the completed tray. Note that the hinge pin is captured by a screw on the tray. You can see the nutplates that will hold the ECM in place.

   Top view. The nutplate in the upper left corner is for the screw that captures the hinge pin.
 
ECM mounted to the tray. It is shock mounted with rubber grommets and foam pads at each corner.

   Tray hinge support riveted in place and tray rotated down. Very easy access to the ECM.
 
Tray in the raised position. You can see the two nutplates for the screws that hold the rear of the tray up.   View from the front. I'll leave just enough slack in the wires to allow it to rotate down far enough to unplug the connectors, then rotate it down further to unscrew it from the tray.

 

http://picasaweb.google.com/afulmer1/SubEControlsCompartment

http://picasaweb.google.com/afulmer1/RearBatteryTrayRV7WithEggenfellnerE6TOnFirewall

Do not fly without a minimum of:
 

DO NOT USE AN IGNITION SWITCH TO TURN ON / OFF POWER TO THE ECU OR FUEL PUMP.  USE THE KEYED SWITCH FOR CRANKING THE ENGINE ONLY.