Charlie,

I have connected two devices to a narrow band O2 sensor in addition to the EC2 with good results.  The devices have to have high input impedance.

I don't have an EM device, but others have connected both the data in and out lines to the EC2/3 to the serial converter for the data logging and observation and Ed's EFISM with a double pole double throw switch.  Only one of the systems can be used at a given time.

For the CAS, I used the same connector as for the fuel injectors.  It required the pins in the CAS to be bent into a slight offset.  The arrangement has been working for the two CAS on my test stand for some time now without any problems.

The exhaust manifold O2 sensor on my 2009+ Renesis is a four wire wide band sensor which uses a different control system than the aftermarket wideband sensors I've seen.  The O2 sensor further downstream is a narrow band sensor.  The pre-2009 Renesis may be different, though.

Using switches with excess current capability for the fuel injectors doesn't seem to be a bad idea.  Dennis probably can give you some direct feedback on this.

Steve Boese
RV6A, 1986 13B NA, RD1A, EC2
________________________________________
From: Rotary motors in aircraft <flyrotary@lancaironline.net> on behalf of Charlie England <flyrotary@lancaironline.net>
Sent: Tuesday, June 03, 2014 7:50 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: controller, sensor, wiring questions

I've got two sensors off RX-8 exhaust manifolds, so money shouldn't be
an issue. However, apparently on the EC3 supports wide band sensors; the
latest EC2 will do auto tune with a narrow band sensor but doesn't
support wideband.

If I can use the RX-8 sensor & it will still work as a narrow band to
feed the EC2, that would be great. Do you have a link that describes
hooking one up to do both wide & narrow band?

Thanks,

Charlie
(BTW, I'm aware that the inrush current to the injectors is much higher
than steady state, but I'd think that it would be of incredibly short
duration, so average load on the contacts should be very low.)

On 6/3/2014 7:43 AM, Bobby J. Hughes wrote:

Also most wide ands also have a narrow band output for other devices.

Bobby

Sent from my iPhone

On Jun 3, 2014, at 7:39 AM, "Bobby J. Hughes" <flyrotary@lancaironline.net> wrote:

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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