ignition timing and A/f Options

[ncgalant]

Alright, lets get down to it. I'm looking for power. Given that, which is better, a little richer and more ignition timing, or leaner and less timing? Currently I'm working toward the latter, but want some input from some that run fast.

Also, which is better for spool, lean or rich. I can't get my pre-boost #s into the rich range. If I do a 3rd gear pull from 1500-6500. My O2s will read .08 until 3500 or so when they jump up to .8 and then .9 around 4000. My setup is working, but I want it to be the best it can be. I can post up my SAFC settings if you guys want too. Their F'd up.

[natedogg]

Higher boost is going to make the charge burn faster and therefore need less ignition timing to make that happen.

I can't wholly agree with this. More boost begets more fuel. Basically to get more power you are trying to stuff more of both in to the combustion chamber while maintaining a safe yet efficient AFR. Since we have more matter in the chamber altogether its going to take more time for all that matter to burn. Obviously we have less time every stroke as the RPM increases so the timing is going to have to advance to maintain an efficient mixture, lest we start throwing fuel out the tailpipe or even worse leave it in the combustion chamber to detonate or wash the cylinder walls. Now exactly how much the timing needs to advance, I don't know. The 5 to 10 degrees of advance may be what works well for the guys on pump gas since it burns more quickly than race gas anyway.