Originally posted by Jon [in CT]
P.S. So, If what I've written here is correct, it should take a full 8 seconds (not 5 seconds) for the Ignition Advance Multiplier (IAM) to change from its initial value of 8 to its max value of 16, assuming no knock.
Great post. Assuming what you've written is correct, then yes it all makes sense. Of course, if it samples more often than once second the period would be less.
Interesting that FUJI filed that patent you reference back in 1991! I wonder how long they've been using it?
Given light of this information, do you think that Vishnu's ECUTEK mapped ECUs still have the low-end map capable of running crappy fuel? I'd had to get a crappy tank of fuel (or someone fills it with 87 on accident!) after a reflash and have the engine detonate to bits because the mapped ECU no longer has the adjustment range to back off enough.
Now knowing this info, it seems that I was correct in thinking that the ECU does adjust timing parameters over specific RPM ranges. But it that general adjustment map seems to affect performance the most.
It would be interesting to learn Shiv's general strategy when designing the various maps what what they change to get so much more power over stock.