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Not sure why 3.3V zeners wouldn't work. A good solid input to the CPUs over the full RPM range is really all we want. Tracy mentioned that during start there's a significant noise from the starter.
After reiterating to Tracy that there already is a 1K resistor across the CAS input on the board, he said if it won't start (signal too low) remove the added 1K resistor in the clamping circuit.
BTW, sounds like he's got a box full of EC3 boards. No CPUs. Not sure about the PCM (Programming/Control module) -- I built my own (part of the instrument panel).
So if he's going to let go of those EC3 boards at cost, you'd have to make your own box, purchase and program the chips, etc., and certainly do not expect support other than what you may find on this list. I thought of taking this on, then remembered an old remark of Tracy's that if he were to calculate his hourly rate he made on selling EC3s, considering the endless hours on the phone and emails, it was probably $0.10/hour :)
I've got too many projects as it is.
Finn
On 6/24/2020 7:52 AM, Stephen Izett stephen.izett@gmail.com wrote:
Hi Finn
ok. Now I recall you mentioning this recently but misunderstood.
Sorry I haven’t read all your emails carefully enough having done the work with tracy.
Good news for this EC3, that being the case.
I’ll see if I have enough time tonight to reprogram the chips as I’m headed down tomorrow and could test the new code.
I tried to pick up some 2.7v zeners today, but they only had 3.3v in single units and 2.7v by the 1000!
So the full wave clipping circuit you supplied should clip the CAS signal to Zener voltage + forward volt drop of the other zener.
2.7+~0.7 = 3.4v. If I use the 3.3v it would clip the signal at 3.3+~0.7=4v. My analog amp knowledge is woefully lacking these days
but I thought this extra 0.6v would be fine for Tracy’s conditioning circuits.
Appreciate any analog insights you can offer re those signal conditioning amplifier/buffers?
Cheers
Steve Izett
On 24 Jun 2020, at 6:27 pm, Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote:
Steve,
It will NOT run programmed for Renesis and LS2 coils unless you reprogram the chips using the source code I uploaded on the 17th of June:
"Here it is:
https://drive.google.com/drive/folders/1mVzPOxUwcGUlPizxnRF40nUyKBzfT4DC?usp=sharing
It's EC3closedloop.zip."
Finn
On 6/23/2020 6:23 PM, Stephen Izett stephen.izett@gmail.com wrote:
Hi Finn
Sorry, I misunderstood. Too many things on my mind at work at present.
When I get to the EC3 mods I’ll:
a. Test the EC3 with new clamped CAS input. If no change and it still runs like a dog on two legs -
b. I’ll reprogram the chips with your hex code and retest.
On another note:
Still trying to decide on whether to pay to have my 4 blue secondary injectors cleaned and tested or
buy new injectors, New ones are cheaper on eBay but are they knock offs that I shouldn’t trust?
Cleaning is $40 each. New ones are $20 each!
Cheers
Steve Izett
On 24 Jun 2020, at 12:04 am, Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote:
Oh, you already reprogrammed them with the fixed code I uploaded?
Finn
On 6/23/2020 10:44 AM, Stephen Izett stephen.izett@gmail.com wrote:
Thanks Finn.
I’ll add the 2 zeners to the EC3 and test it.
I thought the reprogramming of the chips was right.
MPLABS reported them to be good.
Steve
On 23 Jun 2020, at 9:56 pm, Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote:
Attached is an excerpt of the EC3 CAS input conditioning circuit without added clamping circuit and with.
Finn
On 6/22/2020 10:02 PM, Stephen Izett stephen.izett@gmail.com wrote:
Thanks Finn. Did you previously give us a the circuit? Do you have a sketch of it?
I’ll mod the EC3 and see if that is the problem.
Cheers
Steve Izett
<EC3 CAS input with clamp.pdf><EC3 CAS input.pdf>--
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