Thank you to both of you.
Java, those numbers give me somewhere to start, but maybe I just need to understand spark advance a little better and how ecm control relates to manual control. I might be looking for the wrong thing.
Maybe someone can help me here. In reply to TOM85CJ7's post
speed buggy posted two graphs. One was centrifugal advance vs. RPM, the other was engine degrees (advance) vs. vacuum.
I was hoping to get those two graphs for the 304. When I'm tuning my ecm, the Main Spark Table is a 3D table with rpm vs. vacuum (manifold pressure) vs. advance. I was hoping to use those graphs to figure out what numbers to put into my main spark table to start with.
I'm wondering if maybe I'm looking for the wrong thing, but I'm really not sure. Does anyone have experience here that could tell me where to start? If not, just those two graphs would let me get started where I think I should.
In the meantime, I'll use what you gave me Java, and start trying to figure out how to compare the "centrifugal" advance from your chart to the "total" advance the vacuum would throw in as well.