Good idea for a thread Matt. I like that we are starting at the basics here too. So I have a basic idea that I want to hear your comment on as well. One of the things I'm trying to figure out is some kind of base algorithm for spark retard/advance based not only on boost, but rpm. My understanding is that while retarding is good for boost situations, higher rpms require a bit of advance over lower rpms. This is because there is a certain lag time between the spark firing and ignition of the mix in the cylinder. In the case of a lower rpm (and thus slower piston speed) the spark should occur late so that the fuel ignition is in sync with the downstroke. In a higher rpm scenario, you want spark to occur somewhere in the upstroke so that by the time ignition occurs, the piston is starting the downstroke. If timing was kept the same as in low rpms, the piston would be well into the downstroke before the igniton wall hit the piston.

If the timing is not advanced enough, we won't have maximized efficiency and power. Although it's worth sacrificing some hp for safety. Anyways, I was wondering if these ignition systems you guys are running are taking into account rpms at the same time boost. It would be great to just have an equation like f(psi,rpms,intake charge temp)= to begin with. Then I could make an xy coord graph with x-axis as rpms, y-axis as advance/retard, and several different plots on that graph of different psi's. (it'd be a good visual for this kind of stuff) Then we could tune our cars from that starting point, since each engine will be somewhat different.

Oh yea, and who had J&S safeguard on this board?

2gnt: '99 RS-T, killed by a toyota, pending rebuild...
Daily: Volt
Daily #2: '99 EVG ebike- STOLEN by PEDRO