From: "Charlie England" <flyrotary@lancaironline.net>
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Date: Tue, 03 Jun 2014 08:50:06 -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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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a bit behind the times on Tracy's EC2 - but, last I knew it did not have an auto tune feature (my info could easily be out of date), plus it was my understanding that the auto tune feature required the EM2/3 as well as the EC.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
>>>