Originally Posted by JasonC SBB
More data. I will type it here for posterity. If I keep it in a notebook I will more likely lose it.
primary L: 4.7mH below 5.2A, 1.6 mH above
current limit: 10A
delay from signal to beginning of output voltage rise: 6 uS
rise time to 20 kV: 12 uS
peak voltage: 37kV
rise time to 37kV: 48uS
primary L: 7mH
current limit: 6.5A
rise time to 20 kV: 25 uS
peak V: 25kV
rise time to 25 kV: 65 uS
primary L: 10 mH
current limit: 6A
delay: 8 uS
rise time to 20 kV: 13 uS
peak V: 36kV
rise time to 36kV: 38 uS
primary L: 3mH
current limit: 5A engine idling with the TEC running
rise time to 20 kV: 9uS
rise time to peak of output: 30 uS
peak output at 4A of current is 35kV
peak output at 5A of current is 40 kV (limit of the high voltage probe)
The TEC coils appear to have a very high output voltage indeed. It seems to have a high turns ratio, and low capacitance. This would also translate to a lower current spark but long duration (with a high peak voltage capability of igniting hard-to-ignite mixtures)
TThe '00 coils are good.
The Toyota coils are good but don't have the same energy storage as the '00 coils.
The '01 seems lousy in comparison, in terms of peak voltage capability and delay. At 7200 RPM, there are 23 uS per degree of timing. If this translates to any real-world performance loss, I don't know.
Just to add to the above in one location for posterity's sake, here are test results of the Infiniti coils provided by Evank.
They had long skinny shafts and a larger body than the Toyota COPs, and are a bit clumsy fit in the 99 cam cover, seemingly hopeless for the 01 cam cover. Their markings were "Hanshin MCP1350", no Nissan logo or part number
Brief disucssion of fitment was here
01+ COPS with MS?
In my own language lol
Input is proportional (e.g. not comparator’ed / schmitt’ed)
Current limit can be 6-8A depending on drive
5A if 2.2V @ 1.7 mA
6A if 2.5V @ 3.6 mA (not recommended to go below this drive)
7A if 3.2V @ 23 mA
7.7A if 4.2V @ 53 mA
drive requriements, assume 5 mA @ 2.5V (output impedance with 5V drive <500 ohms)
Off drive minimum is ~0.8V (drive output V must go below this)
Delay time, trigger fall to start of steep rise in HV – 12 us
With large currents, rise time of HV is 9us
Resonant frequency is 31 kHz
6A Lab supply with 10mF bypass testing
Cur lim = 6.5A
Initial inductance is 3.1 mH
Current rise is very straight.
Dwell times, for 5.5A primary peak current: (94 mJ input energy)
8 V 2.8 mS
10 V 1.78 mS
12 V 1.44 mS
14 V 1.17mS
secondary waveform testing
With 1 kV TVS load
5.5A pri ~55 mA peak sec current, 2 mS ramp down time, ~55 mJ.
(calc est 100:1 turns ratio)
2A primary peak current yields 13 kV pk, unloaded
3A 20 kV
4A 25 kV
5.2A 32 kV @ 35 uS rise time