IGNITION PROJECT

[Mark Mason]

I'm currently working on a system similar to the one described in the
previous messages under the "Re:IGNITION PROJECT" subject heading. I
have a couple questions for anyone with some experience or knowledge in
this area.

1) Ignition advance on my controller will be compensated when a change
in temperature occurs. Should I sense coolant temperature or air
temperature? I know I have to reduce the amount of advance as the
temperature rises. Does anyone have a graph/equation for the rule of
thumb advance compensation versus temperature?

2) Should I bother with temperature compensation or just use the knock
sensor as the "feedback"? Then the uP could learn the change in advance
required and store it so after some running time it would look up the
compensation value.

3) What is the best method to reduce engine speed when a rev limiter is
utilized? Retarding the timing is one suggestion but is it fast enough
to protect an 500 HP engine revving 6000 RPM when a sudden big blast of
Nitrous Oxide is shot into it and the tires break loose? I think
removing the spark from every other cylinder would be a bad idea also (
cylinder wall wash among other things ). Any Ideas?


Any help or suggestions would be much appreciated!

Mark.