I think Tracy's latest upgrade support wideband o2 auto tune without the EM. Skip the narrowband and save some fuel $ during tuning. Your fuel savings will more than pay for the wideband and it's more useful in flight.

Bobby Hughes
Sent from my iPhone

> On Jun 3, 2014, at 6:12 AM, "Ed Anderson" <flyrotary@lancaironline.net> wrote:
>
> Charlie, I'm a bit behind the times on Tracy's EC2 - but, last I knew it did not have an auto tune feature (my info could easily be out of date), plus it was my understanding that the auto tune feature required the EM2/3 as well as the EC.
>
> For best results the EFISM should be grounded to the aircraft electrical ground rather than to a ground pin on some other accessory.  It should not really make a difference, but closer to the battery negative lead the better in my opinion.  Current thought seems to be not to use aircraft chassis as a primary electrical ground.
>
> PS Don't' forget to bring the EFISM with you.
>
> Ed
>
> -----Original Message----- From: Charlie England
> Sent: Monday, June 02, 2014 9:11 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] controller, sensor, wiring questions
>
> Currently building the wiring harness for the engine/controller, & have
> a few questions.
>
> 1st, is anyone running multiple devices that need to see the 1-wire O-2
> sensor? I need to feed both the EC2 (for auto-tune) and Ed A's monitor.
> Will there be a conflict if both are connected to the sensor at the same
> time?
>
> 1a (for Ed A), does your monitor care where it's grounded, for
> stable/accurate measurement? Both pin pairs 19/37 and pins 1/16 go to
> chassis ground, but the pairs are not common to each other in the EC2.
> Should it go direct to chassis, or to one or the other of the ground pairs?
>
> 2nd, I'd like to include Steve Boese's Rotary Copilot running on an
> iPaq, for data logging. I'm fairly confident that I'll need to switch
> pin 27 ( EC2 serial data in) between the two devices. Can pin 7 (EC2
> serial data out) feed both devices at once, or should it be switched, as
> well?
>
> 3rd, the high impedance injectors seem to draw less than 1 A each, when
> on. Are true 10A DC rated switches needed for injector disable, or would
> lower current, AC rated switches do? A true 10 A DC rated switch is not
> that easy  to find (or afford...), and with the draw being effectively
> AC (high speed switching) and <2 A for primary pair and secondary pair,
> it would seem that a 5A DC rated switch should get the job done safely.
>
> 4th, anyone have a source for the RX-8 crank angle sensor connector? I
> can solder directly to the sensor, but I'd rather use proper connectors,
> if possible.
>
> Thanks,
>
> Charlie
>
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