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The EC2 Manual clearly states: “Once you have the mixture correct at mid-power setting (~24” Hg) with Mode 3, you’re ready
to set the low throttle mixture in Mode 2.”
The a-e steps from Steve B’s email is his suggested simplified procedure, which I believe many have used successfully.
Your choice at this point.
Jeff
From: steve Izett [mailto:flyrotary@lancaironline.net]
Sent: Thursday, January 07, 2016 5:56 AM
Subject: Re: [FlyRotary] Re: Tuning
Hi there Steve
I am intrigued that c. directs to adjust the Mode #3 at a MAP below staging.
Tracy’s notes say at approx 23”.
I thought mode #3 would be for above staging.
I’ll go back and re read.
The following assumes that there are no problems with CAS or ignition:
After setting the controller back to all default program values and depending on the update version of your controller, the following excerpt from archive message #54156 of
Mar 6, 2011 may be of interest:
The tuning procedure then becomes the same whether the primary and secondary injector flow rates are different or identical:
a. Set the staging threshold at a MAP corresponding to the high end of the primary injector flow limit using mode 7. (For 40 lb injectors, about 20" MAP works well.)
b. Adjust Mode 3 to get a mid scale O2 sensor reading at a MAP just below the staging threshold MAP.
c. Adjust mode 6 to get a mid scale O2 sensor reading at a MAP just above the staging threshold MAP.
d. Adjust mode 2 for best operation at minimum idle MAP.
e. Adjust the mixture table throughout the useable MAP range using mode 1 or 9 to keep the O2 sensor reading mid scale. (To be honest, I skip step "e" and simply use the manual mixture control to adjust the mixture in cruise.)
"
Steve Boese
RV6A 1986 13B NA RD1A EC2
Thanks Jeff
I thought everything was zero’ed since last program but I’ll go through and reset all settings.
I thought given the parameters set at chip program such as RX8, Staging Point and Large Secondaries I wouldn’t need to play with timing or with Mode 6.
But I’ll go through all of them now.
1. Full reset of EC2 parameters
2. Setup timing and check for ?deg @?RPM
3. Set Mode 3 Inj Flow Rate
4. Set Mode 2 Dynamic Range
5. Set Mode 6 Sec Inj Differential
6. Go to WOT and check adjust mixture
A couple more questions for you guys:
1. What plugs are all you other guys using? Do I have some good options?
2. Remind me how to set eccentric at TDC?
3. Sounds like EC2’s advance curve is not flat, what advance setting for what RPM for stock Renesis 4-port?
4. I can’t seem to find the command for a global reset the EC2, do I need to reset each mode to default, I seem to remember reading of a global reset?
5. Tracy, if your around at present, can you confirm any special quirks for our 4-port or general tuning?
I’ll then check the staging point is at 15.5”
First confirm your timing as per Lynn’s comments.
Did you start with every mode set to ZERO? 1 through 9?? Mixture knob in center???
Your fuel map is 128 bins wide x 256 bins high as in an X/Y graph, with ZERO settings on the vertical scale.
My map is displayed with Ed’s EFISM and is 0 to 256 on the vertical scale; I think Tracy’s EM displays it as -128 to +128.
After setting Mode 3 and Mode 2, all your settings should still read either 0 or 128.
At this point, your fuel flow is based on 23” MP and 0 or 128 fuel value.
I would expect as you open the throttle that more fuel will be required at 30” MP Vs 23” – has always been true with my engine.
Have you confirmed that you actually have a staging-point; i.e., where the injectors flip from just PRI to both PRI and SEC? – Very important to confirm where it is.
Confirm both Timing and Staging; repeat Modes 3 and 2 then use Mode 1 to tune fuel bin value at WOT.
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Hi Guys
Could I get some feedback on process and my thinking here.
I’m seeking to tune in our EC2 Renesis 4 port with Elec adjustable prop
Steps so far (can only run for 15mins before overheating)
OAT is presently 33-40C 91-104F
Prop set course
1. EC2 Injector and Coil diagnostics all good
2. With 2 squirts she starts well after approx 2-3 revs of the starter.
3. Run her up to ~23” and adjusted Injector Flow Rate - Mode #3 for approx Lamba of 1 on Wide Band
4. Set Idle of approx 1200RPM Adjusted Injection Dynamic Range - Mode #2 for same.
All OK to this point. Adjustments made in Mode #2 and #3 of EC2 reflect clearly on Wideband O2.
Switching between A and B computers makes no difference.
Now opening throttle up gets us to approx 5000 rpm (course Prop) but its missing as more power comes on and is quite severe. (Not missing now and then, but constant)
Selecting between A and B computers (Backup CAS) makes no difference)
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