From: "Charlie England" <flyrotary@lancaironline.net>
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Date: Tue, 03 Jun 2014 12:40:27 -0500
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: controller, sensor, wiring questions
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Thanks, Steve. That's good news on the sensor. I've got the DPDT switch 
for the data lines, but was hoping I could feed the 'data out' to both 
devices all the time so I could monitor & data log at the same time. Not 
a big deal, though.

Good news on the CAS connector, too, as I've been unable to find a 
purpose-built connector for it.

My '04 era sensors are 4 wire, as well. Looks like Bobby's 
recommendation is a 5 wire. I'll pursue that avenue since I need an O2 
monitor, anyway.

I think I've found an option for the injector switches. If I use a 3PDT 
switch, I can split the injector loads so I have only one injector per 
pole in the switch. Five amp DC switches are easy to get, and affordable.

I appreciate the help. Thanks to Bobby and Ed, also.

Charlie

On 6/3/2014 11:36 AM, Steven W. Boese wrote:
> 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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