[lovosal]

Hello
It turns out that I had not downloaded the file when I installed the firmware, so I downloaded it and now I have it. I opened it and everything was changed again, so I had to start putting the things I had. I pass the file so you can see what I have configured. It probably won't be right, but there I am stuck with it.
another subject:
I finally got the ecu connectors!! and the pins to make the wire harness that will connect the two ECUs!! I'm even happier and more nervous than before and above all very excited because I see light at the end of the tunnel... at least for now in these things right now. we'll see what happens later! LOL
I attach a photo.

[lovosal]

Hello, I already have mounted the. wire harness and the test bench!!!
Also in one of the connectors it seems that I have found two shielded or protected cables, I think it could be one of them from the crankshaft sensor and the. I don't know another one, I'm going to look at it in the car data to see who it corresponds to. In one of the photos you can see all the finished harness except those two cables

[JHolland]

You have connected the spark plug bodies together but I don't see a connection from there to your 0V.

[lovosal]

Hello,
Yes, until you need to put a line from the body spark to the negative line. And a place to mount speeduino and arduino uno and put their cables. But the coil test, testing coil pins 3 and 4, fired spark plugs one three and four two.
the. The problem is that now the 12 v power supply doesn't work and I tried it with a laboratory source. So I'm looking for something small to put as a source and that I have room for the plates and others.

[dazq]

For a PSU a small battery itself is best , though I often use a 8a smps for bench testing.
Make sure any PSU is good quality to ensure you don't introduce noise into the system (cheap PSU can be very poor).

[lovosal]

thanks, any example or link of some decent type smps 8a 12 v to buy it?

[lovosal]

HELLO.
Here I am again with some more questions.
See if you can help.

I have mounted the boards on the test bench. I've started connecting cables...
my doubts are:
1st.
I have used the two ignition outputs to activate the double coil that I have, I think there was no problem using them at the same time since my coil is a double DIS ignition (the power supply is separate from the board, and it is 12 volts ).

2nd
the output of the arduino uno board that simulates that of the CKP sensor, to which VR of the board do I connect it? I mean if it goes to the VR + or to the VR -? (I have connected it to the VR +).
3rd.
I have put a test injector but in my case without using gasoline, just to be able to see and study it, and make sure it works well. So knowing that it is a low-z injector, and that I need to know what kind of resistors I should put in series to make it work well, the question is: the signs of the side of the no2c board where it is connected, to the positive or negative of the injector ? (I have it set right now on the negative (-) and the positive is fed directly from the source).
I still need to be able to find out what resistors to put on the injector since for me, and after searching a lot (I'm still looking), I haven't found hardly any references or data on this injector, since it is a single point and is mounted on the body of the injection butterfly. I know mine is 2 ohms and according to the wiki calculator, setting the voltage to 14 volts would give me 8 amps. it would be correct? apply the intensity formula:
I=V/R; I=14/2= 8Amp. But I am doing something wrong because the calculator tells me that I am out of range to calculate the resistance of this injector.

[PSIG]

1st.
I have used the two ignition outputs to activate the double coil that I have, I think there was no problem using them at the same time since my coil is a double DIS ignition (the power supply is separate from the board, and it is 12 volts ).

Correct. Two dual-output coils on two IGN channels.

2nd
the output of the arduino uno board that simulates that of the CKP sensor, to which VR of the board do I connect it? I mean if it goes to the VR + or to the VR -? (I have connected it to the VR +).

Correct, VR+. Be sure the simulator grounds to Speeduino also. I power the simulator from the Speeduino board, so (+) and (-) are guaranteed.

3rd.
… the question is: the signs of the side of the no2c board where it is connected, to the positive or negative of the injector ? (I have it set right now on the negative (-) and the positive is fed directly from the source).

Correct. The ignition and injection are grounding outputs.

I still need to be able to find out what resistors to put on the injector since for me … I know mine is 2 ohms …

OK, the injector needs resistance to prevent burn-out. You are correct, that 14V/2Ω = 8Amp, but the injectors would overheat at 8A. TBI injectors typically operate at 2 or more amps. I use 3 to 5Ω/25W wire-wound resistors in my projects. The resistor calculator is to determine the ohms to operate at >2A, not 8A. Examples:
14V / (2Ω + 5Ω) = 2A, and 2A * 14V = 24 Watts; so a 5-ohm / 25W resistor works.
Or with 3-ohm resistor:
14V / (2Ω + 3Ω) = 2.8A, and 2.8 * 14V = 39.2W; so a 3-ohm / 40 to 50W resistor works.
At 85% max injector duty cycle, 39.2W is 33.3W. If you typically operate below full-throttle, smaller resistors can also work.

2-ohm_INJ_resistor.jpg (83.26 KiB) Viewed 1613 times

25W_wire-wound_resistor.jpg (7.08 KiB) Viewed 1613 times

[lovosal]

ohhh, now I get it! We had to add to the resistance that the injector gives us, another resistance to get it to reach 2 amps approx. but:
1st
When it comes to taking the project to the car, will that same resistance serve? i.e. will it work well in any duty cycle range, be it at full throttle or idling?
Or will I have to do some trial/error to get it to work fine both at idle and at full power?

2nd
Is there a reason you would use the 5 ohm/25 w resistor instead of the 3 ohm 40/50 w resistor in your projects?

Thank you very much for answering and clarifying my doubts!

[PSIG]

A good resistance works full-range. You know if you have low enough resistance if the latency (dead time) is following specifications. It will be the same at any rpm, but of course different at various voltages. For example, I use 5-ohms with common GM/Holley/Rochester 660cc TBI injectors, and the milliseconds is at-spec ±0.4ms @ 14V. This means I do not need lower resistance, loading the injector and circuits harder with more heat. If the latency was slow or off-spec, then the resistance is too high (amps low).

That said, 3-ohms (5 total for yours) is not stressing a Speeduino injector circuit, so do what makes sense to you and tests well. Perhaps you have very cold starting conditions with low battery voltage sometimes. You may want to add some insurance by using a lower-ohm resistor. Again, make your choice, but test at the low voltage to verify proper function. Have fun!