|
|
Ed Anderson wrote:
Ernest, not familiar with your EFI system. However, your statement about hardwiring it for 20 deg and then using the computer to add advance caught my attention - normally that is not how it is done. It is difficult for a CPU design to "ADD" or advance ignition timing from a static timing point as that implies it has to know in advance (precognition but not pre-ignition - sorry, couldn't help it) when the next firing event is coming. All of the EFI units that I am familiar will set or "Hardwire" the static timing to the maximum amount of ignition timing advance they will ever want. Then the computer is used to retard the timing from that point which is much easier to do. Tracy's EC2 uses this method and that is why his instruction have you set the static ignition timing to 31-35 Deg BTDC and then the CPU simply backs off to there to the "Advance" you want.
FWIW
Ed
http://www.megamanual.com/ms2/EDIS.htm
There is no way I can explain it any better than this. My understanding is that for the EDIS system there is a basic advance set by the physical alignment of the parts. That advance is then increased by a controlling computer with the SAW signal. There is precognition of sorts. Because of the missing tooth, the controller knows when the cylinder is coming up to TDC.
|
|