Turns out that the C28 change is/was
not needed.
From the EC3 program comments:
";*****???? Closed Loop testing.?????? Mode 1 works very well except
that at low throttle there is some hunting.?? Engine wants to be
richer at low throttle.
;?????????????? The O2 sensor response on N109TC seems to be too slow,
may need new O2 sensor.?? This causes a little hunting at low
throttle and way too much hunting (to the point of MAP table
undershoot) in Mode 3.
;06-13-12??
Possible reason for slow O2 response is too
much capacitance on the sensor line.?? With the EM3 installed and
the EC3, there is a total of .2uf.?? I am changing these values to
.001 in an effort to
;speed up response."
I highlighted "possible".
Not documented, but appears the problem was handled by software
changes.
In any case, if your unit is from 2010 it won't have the closed
loop mode.
Tracy told me not to change C28 on my board. Only recommended the
CAS clamping circuit posted elsewhere.
In any case, if you decide to reprogram your chips to get the
latest code that include closed loop mode, and then discover a
lagging O2 sensor problem, you can always change C28.
In my case I do not use theEM3?? O2 sensor input. I get?? it from
the EC3. (That is a user?? option in the EM3).
I have seen no evidence that programming for knock sensor input
was actually done. On other words, hardware is there, no software
for it. I could be wrong.
Finn
On 7/6/2020 3:38 PM,
argoldman@aol.com wrote:
Hi Fin, and all
Been?? pouring over the schematics etc. for ec-3 and em-3
that have been posted.
At the outset let me confess that I am a rank dyslexic
beginner at reading (and understanding) schematics.
I have a ec-3 and em-3 which my records show that I
purchased in April of 2010.
Reading through the documents, it seems like the only
change he made with the?? 6/13/12??update??was to
substitute a .001uf cap for existing at C28. Was the only
change. For what reason was it done and is it suggested to
make that modification.
I also noticed that he has an input lead pin 38 IC1 for a
knock sensor.
Was there a software update between when I got mine and
when he stopped shipping. Is it available and is it
significantly important. Was the knock sensor included in that
upgrade?
HELP!!!?? I'm learning just enough to become dangerous
(mainly to my psyche) as I near the engine installation and
testing (probably early next spring or with the weather we
have been having--mid winter. (Chicago)
Any suggestions (other than to can the RMS (already
installed)) to soothe my psyche?
Thanks again