Megasquirt MS3+MS3X+ jimstim CAS simulation
#1
MS3+MS3X+ jimstim CAS simulation
I can simulate up to about 3800 rpm by turning the rpm pot but then it pukes out and goes to zero.
I have dip switch 5 on for 24/2 (Nippondenso) and the second trigger connected to the cam input on the ms3x.
Any ideas?
I have dip switch 5 on for 24/2 (Nippondenso) and the second trigger connected to the cam input on the ms3x.
Any ideas?
#2
Rotary Enthusiast
I'd like to know that too, but a thought just occured to me. The cable that connects the CAS to the MS3/MS3x is shielded, and grounded to ECU ground. I wonder if the issue is due to interference or lack of proper grounding (the signal past a certain point the simulated signal becomes too noisy and can no longer be read)?
#6
MegaSquirt Mod
I've heard of people putting a capacitor on the 2nd trigger output of the jimstim to more reliably trigger. Also, are you running +12v into both the ms3 and the ms3x inputs or +5v from the jimstim?
Ken
Ken
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#9
MegaSquirt Mod
#13
Rotary Enthusiast
I know, I tried the capacitor inline too but it didn't work either. I was able to test both values. Which is why I ask if it's meant to be inline or tied into the StimJim somehow.
#18
Rotary Enthusiast
Inline--no RPM.
With one leg to ground and one hooked between 2nd Trigger and CAM, RPM reading but otherwise no change. The particular type of capacitor didn't have a polarity marking on it, but I tried different legs on each value with no change in operation.
I should mention that the capacitors are from a 200-in-1 electronic project lab, http://www.amazon.com/Elenco-MX-907-.../dp/B000IXPYSM and I simply used jumper wires to connect the resistor in the lab to the StimJim. The jumper wires were long, so voltage drop could be a factor in whether the capcitor worked or not.
With one leg to ground and one hooked between 2nd Trigger and CAM, RPM reading but otherwise no change. The particular type of capacitor didn't have a polarity marking on it, but I tried different legs on each value with no change in operation.
I should mention that the capacitors are from a 200-in-1 electronic project lab, http://www.amazon.com/Elenco-MX-907-.../dp/B000IXPYSM and I simply used jumper wires to connect the resistor in the lab to the StimJim. The jumper wires were long, so voltage drop could be a factor in whether the capcitor worked or not.
#19
MegaSquirt Mod
I'll try to get a look at your settings tonight, but I did test a similar config on my bench last night and it worked fine. The only difference is that I was using this on the ms3x board:
http://www.diyautotune.com/catalog/j...led-p-474.html
Ken
http://www.diyautotune.com/catalog/j...led-p-474.html
Ken
#20
Rotary Enthusiast
I'm using a JimStimX, but I bought mine in kit form.
However, while an assembly error is possible, there isn't much on the board to screw up. It's basically a series of LEDs with current-limiting resistors, a few pots, pin headers and a set of microswitches with a DB37 connector.
However, while an assembly error is possible, there isn't much on the board to screw up. It's basically a series of LEDs with current-limiting resistors, a few pots, pin headers and a set of microswitches with a DB37 connector.
#21
Rotary Enthusiast
I'm playing with the dip switch on the JimStim, and I found that enabling Tach Signal Inversion (dip 8, with dip 5 still on) increased RPM to ~5541 before I lose the RPM signal.
#23
Rotary Enthusiast
It was jumpered TachSelect to VRIN and TSEL to VROUT as per http://www.diyautotune.com/tech_arti...zda_fc_rx7.htm
That's what I followed. I need to open the casing to double-check.
--opened it up. TachSelect to VRIN and TSEL to VROUT
That's what I followed. I need to open the casing to double-check.
--opened it up. TachSelect to VRIN and TSEL to VROUT
#24
I'm using a JimStimX, but I bought mine in kit form.
However, while an assembly error is possible, there isn't much on the board to screw up. It's basically a series of LEDs with current-limiting resistors, a few pots, pin headers and a set of microswitches with a DB37 connector.
However, while an assembly error is possible, there isn't much on the board to screw up. It's basically a series of LEDs with current-limiting resistors, a few pots, pin headers and a set of microswitches with a DB37 connector.
I think you will find that if you look at the jimstimx that the cam pin just connects directly to the ms3x pin that I am jumping to so there really isn't much room to mess anything up.
#25
It was jumpered TachSelect to VRIN and TSEL to VROUT as per http://www.diyautotune.com/tech_arti...zda_fc_rx7.htm
That's what I followed. I need to open the casing to double-check.
That's what I followed. I need to open the casing to double-check.
This is the way mine is configured.