As of Friday afternoon.
I am buying parts for 100 coil on plug units to be used for testing
by Mazda (hopefully) and others.
Will fire six times or more around TDC at 11,000 RPM.
If somebody wants one or more for testing let me know.
Paul Lamar.... Still in Virgina
If all goes as planned be back in SOCAL Sunday night.
Fantastic Paul, Milo
Can I trigger them with the older crank angle sensor?
Lewis Bjorkacro
You can but you will only get two sparks close together on the front
rotor. I take it this is the one you are talking about. A simple
circuit could be built to use the lower part and count pulses.
Best to take it out and save the weight. ABS wheel speed sensors are
cheap and two are required for a two rotor. Or you can use 3rd gen
or RX8 sensors. You can also make your own as all they are is a bar
magnet with a coil of wire wound around it.
This ignition system can also be triggered directly by a computer
but it must be reprogrammed to eliminate the dwell time and enable
multiple sparks.
Paul Lamar Back in SZP
I'd like two for my single rotor. Tell me how much $ and
when/where.
Lewis.
In about 2 weeks. Introductory price is $175 each plus shipping.
Paul Lamar
Paul, one per plug, or one per rotor?
Kevin Alderman
One per plug. That is a standard in the auto industry now.
Also the rotary racers use one MSD system per plug but one would also
have to buy and old style coil one per plug for another $50 or so.
The MSD stops multi-firing at 4500 RPM. The multi-firing it does do
at low RPM is all grouped around 20 deg BTDC within a few usec.
Paul Lamar
I suppose if the leading and trailing plugs are both fired at 20
BTC, you could get one waste spark coil per rotor.
Dale Davies
That is a feature I have not yet implemented but it is possible with
my system.
Paul Lamar
Kevin,
Forgive me if this is a little simple minded and has already been
covered, but if you used a stock trigger wheel or something like a
60-x wheel or similar, couldn't you program your ECU to fire as many
pulses as you want at any given advance? This assumes of course you
have enough outputs to fire all four ignitions.
It seems to me that fixing the advance on an ignition is a step
backwards, especially considering the potential of this new ignition
system.
Paul - I know it's possible to delay an analog signal with some clever
circuit design... how difficult would it be to put together
'controller' board that can sense RPM and delay your pulses
appropriately for the load condition? This way you set the triggers
to max advance, and delay it with the board. This would work more or
less like a mechanical advance. If you wanted to get really clever,
you could incorporate something to sense vacuum and boost, but having
a two variable advance would likely be much more difficult to do with
hardware alone.
-Josh Jacobs
IMHO Kevin is programming the Ardunio as a full blown EFI. No need for a
separate
PC board. The Ardunio can do it all.
For a car like the RX8 one would need a computer to take into
consideration the 2 ms dwell and then fire the plugs six times
in 10 degree increments at the proper E-shaft angle. I will eventually get
around to doing that. One needs a variable delay depending on RPM.
My computer of choice would be the:
http://www.mikroe.com/mini/stellaris/
ARM Mini-M4 available from Mouser for $30 or $40.
A simple tach circuit is a 555 and for MAP a Free Scale pressure
sensor sending analog voltage to the Mini-M4 A to D
input. Then you can get fancy with advance inversely proportional to MAP.
My language of choice is Mikroe compiled BASIC.
EFI then becomes cheap :)
Paul Lamar
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