Quote:
Originally Posted by mysocal911
Not really! The DME ECM just waits a constant time period (~ 1.0 - 1.5ms, spark dwell) before switching-on the output TO-3 Darlington transistor, irrespective of RPM,
to develop the next spark energy. It operates basically the same as a points ignition system, not like the later ignition systems where the time delay for spark energy
development varies based on RPM. Oscilloscope waveforms of the DME ECM pin 1 verify this.
When Blaster coils are used in a 911 3.2, they provide a spark energy basically the same as the OEM Bosch coil, based on their tested parameters as provided here;
Typical Ignition Coil Values: https://www.systemsc.com/diagnostic.htm
As indicated by the coil parameters of the two Blaster coils and the OEM Bosch coil (911 TCI), the electrical parameters are with 10% of one another.
Furthermore, since the coil series resistance is a little higher on the Blaster coils, less heat will occur to the DME ECM output transistor coil driver
when coil current saturation occurs. |
Not correct, the DME has a 3D spark dwell table and varies spark duration per crank rev based on system voltage and RPM. the table looks like this:
I have tuned this table for different coil types in the past.
Is the blaster coil similar to the stock coil specs, that I don't know but I take your word for it. Or one could bench test it to find out the exact time it takes to fully charge and saturate the coil and various voltages.